Faculty Profiles - Hong, Chungpyo

写真a

Hong, Chungpyo

Organization

Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Department of Engineering Mechanical Engineering Program Professor

Degree

Doctor (Engineering) ( 2007.3 Tokyo Metropolitan University )

Research Areas

Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

Research History

Kagoshima University Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Mechanical Engineering Course Associate Professor

2020.4
Kagoshima University Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Mechanical Engineering Course Associate Professor

1955.4 - 2020.3

Professional Memberships

ASME

2015.10
日本伝熱学会

2015.10
日本機械学会

2015.10

Papers

Hong C., Asako Y., Morini G.L., Faghri M. . Variations in gas temperature and average velocity during laminar-turbulent transition in high-speed gas flow through microtubes . Experimental Thermal and Fluid Science155 2024.6Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal) Publisher：Experimental Thermal and Fluid Science

The primary objective of this study is to investigate variations in gas temperature and average velocity during the laminar-turbulent transition of compressible flow. This investigation encompasses an exploration of the effect of Mach number on transitional Reynolds number. Experiments were conducted utilizing a pair of adiabatic stainless steel microtubes with a diameter (D) of 131.6 μm. The first microtube was dedicated to measuring local pressure to obtain friction factor, local Mach number, and bulk temperature. The second microtube was employed for measuring local wall temperature. Additionally, a stainless steel microtube with a diameter (D) of 124 μm and a rectangular microchannel with a hydraulic diameter (Dh) of 99.36 μm were incorporated in the study. Friction factor, Mach number, and bulk temperature were determined by measuring mass flow rate and local pressure near the outlet. The measured mass flow rate exhibited a slight increase that plateaued during the laminar-turbulent transition as the Reynolds number increased. In laminar flow, an increase in the Reynolds number resulted in an increase of the Mach number and a reduction in bulk temperature. Conversely, during the laminar-turbulent transition, the Mach number either remained constant or decreased, and the bulk temperature increased due to the conversion of kinetic energy to thermal energy. Experimental validation of this phenomenon was achieved by measuring the wall temperature of an adiabatic microtube.

DOI： 10.1016/j.expthermflusci.2024.111196

Scopus
Asako Y., Hong C., Tan L.K., Faghri M. . Performance evaluation criteria based on the first and second laws of thermodynamics . International Communications in Heat and Mass Transfer154 2024.5Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal) Publisher：International Communications in Heat and Mass Transfer

Numerical simulations were conducted to investigate the correlation between assessments based on the total entropy generation rate criterion and the thermal resistance criterion in the context of evaluating heat transfer performance. This study focused on a parallel plate channel heat sink with the lower wall subjected to a constant heat flux, under various flow constraints. The flow was assumed to be laminar and fully developed. The energy equation was discretized using the control volume-based power law scheme, and the resulting algebraic equations were solved by the line-by-line method. Optimal channel heights which lead to minimize irreversibility and temperature difference between heated wall and inlet fluid temperatures were determined by both the total entropy generation rate and thermal resistance criteria under four distinct flow constraints: identical mass flow rate, identical inlet velocity, identical pumping power, and identical pressure drop. The investigation revealed a lack of significant correlation between the optimal channel heights derived from assessments based on the total entropy generation rate and thermal resistance. Consequently, the utilization of the total entropy generation rate criterion for evaluating heat transfer performance, based in the second law of thermodynamics, instead of the thermal resistance criterion, based in the first law of thermodynamics, was deemed inappropriate. The total entropy generation rate criterion was based on the minimization of the irreversibility and served as an indicator of heat transfer quality. As a recommendation, it is suggested that results obtained from both the total entropy generation rate and thermal resistance criteria for assessing heat transfer performance be presented separately for each specific application.

DOI： 10.1016/j.icheatmasstransfer.2024.107437

Scopus
Asako Y., Hong C., Yamaguchi Y., Faghri M., Tan L.K., Sidik N.A.C. . Physically Realistic Inlet-Velocity Profiles in Duct Flows . Heat Transfer Engineering 2024Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal) Publisher：Heat Transfer Engineering

A uniform inlet velocity profile is widely used in the numerical simulations of fluid flow and heat transfer in ducts for both incompressible and compressible flows. In incompressible flows, the calculated fluid pressure at the inlet edge is extremely high and affects the calculation of the average pressure. In compressible flows, the fluctuation of pressure in the flow direction results in the fluctuation in the velocity. This has motivated this study to numerically investigate a physically realistic velocity profile at the inlet of a pipe rather than using a uniform velocity profile. The numerical simulations were based on the control volume-based power law scheme and the semi-implicit method for pressure-linked equations (SIMPLE) algorithm. The continuity and momentum equations for a flow in a pipe with the rounded inlet corner were solved to obtain a physically realistic inlet velocity profile. The obtained inlet velocity profile was expressed by a simple expression in the range of Reynolds number from 100 to 2000. Using this velocity profile, both the incompressible and compressible flows in a pipe were numerically investigated. The results resolved the previously observed inconsistencies in the pressure that were previously observed in the numerical simulations with uniform inlet velocity profiles.

DOI： 10.1080/01457632.2024.2308355

Scopus
Hong C., Katanoda H., Asako Y., Faghri M. . Temperature recovery factor for gaseous nitrogen flow in a microtube . International Journal of Heat and Mass Transfer202 2023.3Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Heat and Mass Transfer

For gas flow over a flat plate, the temperature recovery factor is defined as a fraction of free-stream total temperature rise recovered at the wall or is the ratio of the actual temperature rise at the wall to the maximum possible temperature rise in the free-stream. Its value depends on Prandtl number and is independent of Mach number. The gas velocity and temperature are determined by the temperature recovery factor using the adiabatic wall temperature. It is an important parameter to be used to evaluate the gas velocity and temperature indirectly. In the present study, for internal flow, a methodology was introduced to estimate the temperature recovery factor numerically based on the total and bulk temperature for both laminar and turbulent flow regions in a microtube. The numerical simulations are based on the arbitrary Lagrangian-Eulerian method. The compressible momentum and energy equations for an ideal gas were solved to obtain the temperature recovery factor. To further validate the temperature recovery factor from numerical results, experiments were conducted using stainless steel microtubes. Although it is not a direct comparison, the gas bulk temperature and Mach number that were determined by the temperature recovery factor were compared with the experimental results and they were in good agreement.

DOI： 10.1016/j.ijheatmasstransfer.2022.123688

Scopus
Mohd Tamam M.Q., Omi M.R.T., Yahya W.J., Ithnin A.M., Abdul Rahman H., Rahman M.M., Abd Kadir H., Noge H., Koga T., Hong C., Otaka T., Kinoshita E. . Engine performance and emissions evaluation of surfactant-free B30 biodiesel–diesel/water emulsion as alternative fuel . Scientific Reports13 ( 1 ) 10599 2023.12Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal) Publisher：Scientific Reports

Malaysia is one of the top exporters of palm oil, and although currently facing fierce resistance towards palm oil imports in some parts of the globe, one of the ways to utilize this commodity is by increasing palm biodiesel content in local commercial diesel. However, due to the oxygen-rich nature of biodiesel, its utilization suffers from increased nitrogen oxides (NOx) emission compared to conventional diesel. To mitigate this issue and improve diesel engine performance and emissions using biodiesel–diesel blends, this study attempted to investigate implementation of a real-time non-surfactant emulsion fuel supply system (RTES) which produces water-in-diesel emulsion as fuel without surfactants. NOx reducing capability of water-in-diesel produced by RTES has been well documented. Therefore, in this study, 30% biodiesel–diesel (B30) was used as the base fuel while B30-derived emulsions consisting of 10 wt%, 15 wt% and 20 wt% water content were supplied into a 100 kVA, 5.9-L common rail turbocharged diesel engine electric generator. Fuel consumption and exhaust emissions were measured and compared with commercially available Malaysian low grade diesel fuel (D2M). Evidence suggested that emulsified B30 biodiesel–diesel produced by RTES was able to increase brake thermal efficiency (BTE) up to a maximum of 36% and reduce brake specific fuel consumption (BSFC) up to 8.70%. Furthermore, B30 biodiesel–diesel emulsions produced significantly less NOx, carbon monoxide and smoke at high engine load. In conclusion, B30 biodiesel–diesel emulsions can be readily utilized in current diesel engines without compromising on performance and emissions.

DOI： 10.1038/s41598-023-37662-4

Scopus

PubMed
Abdul Rahman H., Rahman M.M., Yahya W.J., Kaonain T.E., Abd Kadir H., Tamam M.Q.M., Ithnin A.M., Ahmad F., Abdullah M.F.E., Noge H., Hong C., Otaka T., Kinoshita E. . Implementation of a Non-Surfactant Water-in-Diesel Emulsion Fuel in a Common Rail Direct Injection Diesel Vehicle . International Journal of Automotive Technology24 ( 5 ) 1349 - 1358 2023.10Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Automotive Technology

Water-in-diesel emulsion fuel has become a popular alternative fuel for diesel engines. The main limitation is related to its stability, whereby it relies heavily on surfactants to remain homogeneous, therefore causing production costs to rise. This paper highlights the application of real-time non-surfactant emulsion fuel supply system (RTES), a water/diesel emulsifying device without surfactants, to produce water-in-diesel emulsion fuel in a common rail direct injection diesel engine powered vehicle. In this study, RTES was installed near to the diesel fuel pump to ensure water-in-diesel emulsions were continuously fed to the engine. The test vehicle was set up on a roller dynamometer and operated following a modified West Virginia University (WVU) 5-Peak cycle. Fuel consumption and exhaust emissions were measured to determine the optimum water percentage of emulsion fuel and suitable timing for emulsion fuel to be introduced into the fuelling system based on the vehicle speed. The results revealed that the optimum water percentage of the emulsion fuel for the test vehicle is 10 wt%, as it was capable to reduce fuel consumption as well as nitrogen oxides and smoke emissions of a common rail direct injection diesel engine powered vehicle.

DOI： 10.1007/s12239-023-0109-3

Scopus
Lam B.C., Asako Y., Hong C., Tan L.K., Sidik N.A.C. . Validity of Performance Factors used in Recent Studies on Heat Transfer Enhancement by Surface Modification or Insert Devices: Constant Heat Flux Case . Journal of Advanced Research in Numerical Heat Transfer11 ( 1 ) 1 - 4 2022.9Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Advanced Research in Numerical Heat Transfer

Heat transfer enhancement had been widely applied in developing a more compact heat exchanger which can save a lot of energies, materials and costs. Based on our literature review, the performance factors that proposed previously had been widely used in various papers to evaluate the heat transfer enhancement. However, no validation had been conducted before to validate the performance factors. Recently, the performance factors had been studied for the heat transfer enhancement of a circular duct with periodic annular baffle plates which is heated by constant wall temperature, and the result shown that the performance factors are not valid for evaluating the heat transfer. Whereas this study is examined the validity of the performance factors by comparing the heat transfer rate in a fully periodic developed region of a circular duct to a modifies duct with periodic annular baffle plates, which are heated by constant heat flux. The heat transfer rates are obtained numerically. Validity of the performance factors is examined by comparing the average temperature difference between wall temperature and bulk temperature. It was found that the performance factors used in previous papers except for equation (2) defined below are not valid to evaluate the heat transfer enhancement.

Scopus
Yusof S.N.A. . Validity of performance factors used in recent studies on heat transfer enhancement by surface modification or insert devices . International Journal of Heat and Mass Transfer186 2022.5Reviewed International coauthorship International journal

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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：International Journal of Heat and Mass Transfer

Based on literature survey, the performance factors were used in 62 articles which have been published in 2021 in International Journal of Heat and Mass Transfer, International communications in Heat and Mass Transfer, International Journal of Thermal Sciences and Applied Thermal Engineering, to evaluate the heat transfer enhancement by geometry modification or insertion of tapes, wires or turbulence promoters under identical pumping power. However, the validity of the performance factors was not examined yet. The heat transfer rate in a periodic fully developed region of a circular duct with periodic annular baffle plates was numerically obtained. Comparing the heat transfer rate with that of a circular smooth duct, the validity of the performance factors used in previous studies was examined. It was found that the performance factors used in the previous studies are not valid for the evaluation of heat transfer enhancement. Furthermore, this paper shows that the direct comparison of heat transfer rates without the assumptions of equal surface area and the equal temperature difference is suitable for the evaluation of heat transfer enhancement.

DOI： 10.1016/j.ijheatmasstransfer.2021.122431

Scopus
Hong C. . Heat Transfer of Turbulent Gaseous Flow in Microtubes with Constant Wall Temperature . Journal of Heat Transfer144 ( 4 ) 2022.4Reviewed International coauthorship International journal

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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Heat Transfer

In this paper, we report on experimental results to measure the total temperature of nitrogen gas at the inlet and outlet of microtubes with constant wall temperature and to quantitatively determine the heat transfer rates. Experiments were conducted with nitrogen gas flowing in a stainless steel microtube with a diameter of 524 μm and a copper microtube with a diameter of 537 μm. The temperature differences between the inlet and the wall were maintained at 3, 5, and 10 K by circulating water around the inlet and the wall. The stagnation pressures were also controlled so that the flow, with atmospheric back pressure, could reach Reynolds numbers as high as 26,000. To measure the total temperature, a polystyrene tube with a thermally insulated exterior wall containing six plastic baffles was attached to the outlet. Heat transfer rates were obtained from the gas enthalpy difference by using the pressures and the total temperatures measured at the inlet and outlet. Heat transfer rates were also compared with those obtained from the ideal gas enthalpy using the measured total temperatures and from the Nusselt number of incompressible flows. It was found that the measured total temperature at the microtube outlet was higher than the wall temperature. Also, the heat transfer rates calculated from the total temperature difference were higher than the values obtained from the incompressible flow theory.

DOI： 10.1115/1.4053215

Scopus
D. Rehman, D. Barattini, C. Hong, G. L. Morini . Effect of aspect ratio and inlet manifold shape on the laminar-to-turbulent transition of gas flow in rectangular microchannels . Experiments in Fluids62 ( 52 ) 1 - 19 2021.3Reviewed International coauthorship International journal

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1007/s00348-021-03137-3

Scopus
TANOWAKI Yusuke, KASHIWAGI Ryo, HONG Chungpyo, ASAKO Yutaka . Prediction of flow characteristics for micro-tube gas flow by temperature recovery factor . The Proceedings of Conference of Kyushu Branch2021.74 ( 0 ) B15 2021

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Language：Japanese Publisher：The Japan Society of Mechanical Engineers

DOI： 10.1299/jsmekyushu.2021.74.b15
SEI Tomoki, KIM Minsung, HONG Chungpyo, ASAKO Yutaka . Local friction factors of microchannel gas flow by means of adiabatic wall temperatures . The Proceedings of Conference of Kyushu Branch2021.74 ( 0 ) B14 2021

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Language：Japanese Publisher：The Japan Society of Mechanical Engineers

DOI： 10.1299/jsmekyushu.2021.74.b14
TANIGUCHI Tomohiro, YAMASHITA Satoshi, YAMAGUCHI Ryu, HONG Chungpyo, ASAKO Yutaka . Mach number correlation for microchannel gas flow considering temperature decrease . The Proceedings of Conference of Kyushu Branch2021.74 ( 0 ) A16 2021

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Language：Japanese Publisher：The Japan Society of Mechanical Engineers

DOI： 10.1299/jsmekyushu.2021.74.a16
D. Kang, C. Hong, D. Rehman, G. L. Morini, Y. Asako, M. Faghri . Average Friction Factors of Choked Gas Flow in Microtubes . Journal of Physics: Conference Series1599 ( 1 ) 1 - 9 2020.9Reviewed International coauthorship

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1088/1742-6596/1599/1/012018

Scopus
R. Kashiwagi, C. Hong, Y. Asako, G. L. Morini, M. Faghri . Identification of Gas Flow Regimes in Adiabatic Microtubes by means of Wall Temperature Measurements . Journal of Physics: Conference Series1599 ( 1 ) 1 - 8 2020.9Reviewed International coauthorship

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1088/1742-6596/1599/1/012019

Scopus
C. Hong, T. Shigeishi, Y. Asako, M. Faghri . Experimental investigations of local friction factors of laminar and turbulent gas flows in smooth micro-tubes . International Journal of Heat and Mass Transfer158 1 - 9 2020.9Reviewed International coauthorship

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.ijheatmasstransfer.2020.120035

Scopus
C. Hong, Y. Asako, M. Faghri, D. Rehman, G. L. Morini . Experiments on measurement of heat transfer rate of gas flow through microchannel with constant wall temperature . Journal of Advanced Research in Fluid Mechanics and Thermal Sciences70 ( 1 ) 28 - 36 2020.6Reviewed International coauthorship

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.37934/ARFMTS.70.1.2836

Scopus
Chungpyo Hong, Yutaka Asako, Mohammad Faghri, Gian Luca Morini . Average Friction Factor for Laminar Gas Flow in Microtubes . CFD Letters12 ( 3 ) 22 - 30 2020.3Reviewed

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.37934/cfdl.12.3.2230

Scopus
C. Hong, Y. Asako, M. Faghri, D. Rehman, G. L. Morini . Experiments on Measurement of Heat Transfer Rate Of Gas Flow Through Microchannel With Constant Wall Temperature . Proceedings of the 4th International Symposium on Fluid Mechanics and Thermal Sciences 2019.12Experiments on Measurement of Heat Transfer Rate Of Gas Flow Through Microchannel With Constant Wall TemperatureReviewed

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Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
W. Smith, N. Rahmani, A. Charbaji, N. Lemos, C. Anagnostopoulos, M. Faghri, C. Hong . A Fluidically Controlled BI-Material Actuator For Automation Of Paper-Based Assays . Proceedings of the International Symposium on Thermal Effects in Gas flows In Microscale 2019.10A Fluidically Controlled BI-Material Actuator For Automation Of Paper-Based AssaysReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
R. Yamaguchi, C. Hong, Y. Asako, G. L. Morini . Effects of flow transition on heat transfer of gas flow in micro-tube with constant wall temperature . Proceedings of the International Symposium on Thermal Effects in Gas flows In Microscale 2019.10Effects of flow transition on heat transfer of gas flow in micro-tube with constant wall temperatureReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
K. Nishimura, C. Hong, Y. Asako, D. Rehman, G. L. Morini . Flow characteristics of choked gas flow through adiabatic microtubes . Proceedings of the International Symposium on Thermal Effects in Gas flows In Microscale 2019.10Flow characteristics of choked gas flow through adiabatic microtubesReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
S. Ueda, C. Hong, Y. Asako, D. Rehman, G. L. Morini . Effect of surface roughness on friction factors of gas flow through micro-tubes . Proceedings of the International Symposium on Thermal Effects in Gas flows In Microscale 2019.10Effect of surface roughness on friction factors of gas flow through micro-tubesReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
M. Shimomura, R. Kashiwagi, C. Hong, Y. Asako, G. L. Morini . Wall temperature distributions of gaseous flows in micro-tubes with constant heat flux . Proceedings of the International Symposium on Thermal Effects in Gas flows In Microscale 2019.10Wall temperature distributions of gaseous flows in micro-tubes with constant heat fluxReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
D. Rehman, M. Cavazzuti, C. Hong, G. L. Morini . Friction factor evaluation of compressible microflows using 1D Fanno flow based numerical model . Proceedings of the International Symposium on Thermal Effects in Gas flows In Microscale 2019.10Friction factor evaluation of compressible microflows using 1D Fanno flow based numerical modelReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
D. Rehman, F. Vignati, C. Hong, G. L. Morini . Laminar to turbulent flow transition in a rectangular duct with 1:10 aspect ration evaluated using DNS Rans Transitional turbulence model . Proceedings of the International Symposium on Thermal Effects in Gas flows In Microscale 2019.10 Laminar to turbulent flow transition in a rectangular duct with 1:10 aspect ration evaluated using DNS Rans Transitional turbulence modelReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
C. Hong, Y. Asako, M. Faghri, G. L. Morini . Average Friction Factor Between Inlet and Outlet For Laminar Flow Of Gas In Microchannels . Proceedings of the 3th International Symposium on Fluid Mechanics and Thermal Sciences 2019.9Average Friction Factor Between Inlet and Outlet For Laminar Flow Of Gas In MicrochannelsReviewed

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Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
D. Kang, C. Hong, D. Rehman, G. L. Morini, Y. Asako, M. Faghri . Average Friction Factors of choked gas flow in Microtubes . Proceedings of the 37th UIT Heat Transfer Conference 2019.6Average Friction Factors of choked gas flow in MicrotubesReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
R. Kashiwagi, C. Hong, Y. Asako, G. L. Morini, M. Faghri . Identification of Gas Flow Regimes in Adiabatic Microtubes by means of Wall Temperature Measurements . Proceedings of the 37th UIT Heat Transfer Conference 2019.6Identification of Gas Flow Regimes in Adiabatic Microtubes by means of Wall Temperature MeasurementsReviewed

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Language：English Publishing type：Research paper (international conference proceedings)
Kenshi Maeda, Chungpyo Hong, Yutaka Asako . Flow Characteristics of Transition Region Between Laminar and Turbulent Gas Flows Through Micro-Tubes . Journal of Advanced Research in Fluid Mechanics and Thermal Sciences56 ( 1 ) 10 - 19 2019.5Flow Characteristics of Transition Region Between Laminar and Turbulent Gas Flows Through Micro-TubesReviewed

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Language：English Publishing type：Research paper (scientific journal)
Maeda K. . Flow characteristics of transition region between laminar and turbulent gas flows through micro-tubes . Journal of Advanced Research in Fluid Mechanics and Thermal Sciences56 ( 1 ) 10 - 19 2019.4

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Language：Japanese Publisher：Journal of Advanced Research in Fluid Mechanics and Thermal Sciences

Scopus
Hong C. . Data reduction of average friction factor of gas flow through adiabatic micro-channels . International Journal of Heat and Mass Transfer129 427 - 431 2019.2

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Language：Japanese Publisher：International Journal of Heat and Mass Transfer

DOI： 10.1016/j.ijheatmasstransfer.2018.09.088

Scopus
Asako Y. . On temperature jump condition for turbulent slip flow in a quasi-fully developed region of micro-channel with constant wall temperature . International Journal of Thermal Sciences136 467 - 472 2019.2

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Language：Japanese Publisher：International Journal of Thermal Sciences

DOI： 10.1016/j.ijthermalsci.2018.10.040

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Rehman D. . A comparison of data reduction methods for average friction factor calculation of adiabatic gas flows in microchannels . Micromachines10 ( 3 ) 2019

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Language：Japanese Publisher：Micromachines

DOI： 10.3390/mi10030171

Scopus

PubMed
Asako Y. . Notes on factitious shear work of slip flow in a channel . International Journal of Heat and Mass Transfer127 444 - 447 2018.12

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Language：Japanese Publisher：International Journal of Heat and Mass Transfer

DOI： 10.1016/j.ijheatmasstransfer.2018.08.008

Scopus
SHIGEISHI Takayuki, HONG Chungpyo, ASAKO Yutaka, KATANODA Hiroshi . An Estimation in the Recovery factor of Micro Gas Flow by Measuring the Adiabatic Wall Temperature . The Proceedings of Conference of Kyushu Branch2018 ( 0 ) 2018

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Language：Japanese Publisher：The Japan Society of Mechanical Engineers

DOI： 10.1299/jsmekyushu.2018.71.B26
Yutaka Asako, Chungpyo Hong . On Temperature Jump Condition for Slip Flow in a Microchannel With Constant Wall Temperature . Journal of Heat Transfer139 ( 7 ) 072402-1 - 072402-7 2017.4Reviewed

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Language：English Publishing type：Research paper (scientific journal) Publisher：ASME

DOI： 10.1115/1.4036076

Scopus
Shigeishi T. . Experimental investigations on friction factors of gaseous flow through a micro-tube with smooth surface . ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)8 2017

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Language：Japanese Publisher：ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)

DOI： 10.1115/IMECE2017-71145

Scopus
Maeda K. . Semi local friction factor of gas flow through a micro-tube . ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)8 2017

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Language：Japanese Publisher：ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)

DOI： 10.1115/IMECE2017-70375

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Sakashita T. . Total temperature measurement of gas at microtube outlet . ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)8 2017

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Language：Japanese Publisher：ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)

DOI： 10.1115/IMECE2017-71146

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D Kawashima, T Yamada, C Hong and Y Asako . Mach number at outlet plane of a straight micro-tube . Journal of Mechanical Engineering Science230 ( 19 ) 3420 - 3430 2016.11Mach number at outlet plane of a straight micro-tubeReviewed

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Language：English Publishing type：Research paper (scientific journal) Publisher：SAGE

DOI： 10.1177/0954406215614598
C. Hong, T. Nakamura, Y. Asako, I. Ueno . Semi-local friction factor of turbulent gas flow through rectangular microchannels . International Journal of Heat and Mass Transfer 2016.4Semi-local friction factor of turbulent gas flow through rectangular microchannelsReviewed

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.ijheatmasstransfer.2016.02.080
C. Hong, Y. Yoshida, S. Matsushita, I. Ueno, Y. Asako . Supersonic micro-jet of straight micro-tube exit . Bulletin of the JSME Journal of Thermal Science and Technology10 ( 2 ) 1 - 9 2015.12Supersonic micro-jet of straight micro-tube exitReviewed

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1299/jtst.2015jtst0026
Y. Yang, C Hong, G.L. Morini, Y. Asako . Experimental and numerical investigation of forced convection of subsonic gas flows in microtubes . International Journal of Heat and Mass Transfer78 732 - 740 2014.11Experimental and numerical investigation of forced convection of subsonic gas flows in microtubesReviewed

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Y. Yang, C. Hong, G.L. Morini . Micro Convective Heat Transfer of Gas Flow Subject to H and T Boundary Conditions . International Journal of Micro-Nano Scale Transport5 ( 3 ) 2014.9Micro Convective Heat Transfer of Gas Flow Subject to H and T Boundary ConditionsReviewed

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Language：English Publishing type：Research paper (scientific journal)
C. Hong, Y. Asako, I. Ueno, M. Motosuke . Total Temperature Measurement of Laminar Gas Flow at Micro-tube Outlet: Cooled from the Wall . Heat Transfer Engineering35 ( 2 ) 142 - 149 2014.1Total Temperature Measurement of Laminar Gas Flow at Micro-tube Outlet: Cooled from the WallReviewed

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Language：English Publishing type：Research paper (scientific journal)
D. Limsukhawat, Y. Dekio, K. Ikebukuro, C. Hong, I. Ueno . Flow patterns induced by thermocapillary effect in a thin free liquid film of a high Prandtl number fluid . Progress in Computational Fluid Dynamics, An Int. J.13 ( 42067 ) 132 - 140 2013.3Flow patterns induced by thermocapillary effect in a thin free liquid film of a high Prandtl number fluidReviewed

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Language：English Publishing type：Research paper (scientific journal)
Shota Hashimoto, Chungpyo Hong, Ichiro Ueno . Transient Growth Process of Precursor Film at Early Stage of Droplet Spreading . Journal of Thermal Science and Technology7 ( 3 ) 487 - 496 2012.7Transient Growth Process of Precursor Film at Early Stage of Droplet SpreadingReviewed

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Chungpyo Hong, Toru Yamada, Yutaka Asako, Mohammad Faghri . Experimental investigations of laminar, transitional and turbulent gas flow in microchannels . International Journal of Heat and Mass Transfer・ELSEVIER55 4397 - 4403 2012.7Experimental investigations of laminar, transitional and turbulent gas flow in microchannelsReviewed

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Chungpyo Hong, Yutaka Asako, Koichi Suzuki, Mohammad Faghri . Friction Factor Correlations for Compressible Gaseous Flow In Concentric Micro Annular Tube . Numerical Heat Transfer Part A・Taylor & Francis 61 ( 3 ) 163 - 179 2012.2Friction Factor Correlations for Compressible Gaseous Flow In Concentric Micro Annular TubeReviewed

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Chungpyo Hong, Takaharu Yamamoto, Yutaka Asako, Koichi Suzuki . Heat Transfer Characteristics of Compressible Laminar Flow Through Microtubes . Journal of Heat Transfer・ASME134 ( 1 ) 011602(1) - 011602(8) 2012.1Heat Transfer Characteristics of Compressible Laminar Flow Through MicrotubesReviewed

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C. Hong, Y. Asako, I. Ueno, K. Suzuki . Estimation of Flow Characteristics in Micro-geometries . International Journal of Microscale and Nanoscale Thermal and Fluid Transport Phenomena3 61 - 75 2012.1Estimation of Flow Characteristics in Micro-geometriesReviewed

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Chungpyo Hong, Yutaka Asako, Ichiro Ueno, Koichi Suzuki . Estimation of Flow Characteristics in Micro-geometries . International Journal of Microscale and Nanoscale Thermal and Fluid Transport Phenomena3 61 - 75 2012Estimation of Flow Characteristics in Micro-geometriesReviewed

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Kohei Koyama, Chungpyo Hong, Yutaka Asako . Effect of Partition Wall on Heat Transfer Characteristics of a Gas-to-Gas Counterflow Microchannel Heat Exchanger . Heat Transfer Engineering33 ( 6 ) 533 - 547 2011.12Effect of Partition Wall on Heat Transfer Characteristics of a Gas-to-Gas Counterflow Microchannel Heat ExchangerReviewed

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Language：English Publishing type：Research paper (scientific journal)

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MISC

Letter to the editor: “Shear work contribution to convective heat transfer of dilute gases in slip flow regime” (P. Vocale, G.L. Morini, M. Spiga, S. Colin, European Journal of Mechanics B/Fluids, 64 (2017) pp. 60–68)

Asako Y.

European Journal of Mechanics, B/Fluids 72 2018.11

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Language：Japanese Publisher：European Journal of Mechanics, B/Fluids

DOI： 10.1016/j.euromechflu.2018.06.006

Scopus

Presentations

Tomoki SEI, Minsung KIM, Chungpyo HONG, Yutaka ASAKO Local friction factors of microchannel gas flow by means of adiabatic wall temperatures International coauthorship

2021.3 JSME

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Event date： 2021.3

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Yusuke TANOWAKI，Ryo KASHIWAGI, Chungpyo HONG, Yutaka ASAKO Prediction of flow characteristics for micro-tube gas flow by temperature recovery factor International coauthorship

2021.3 JSME

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Event date： 2021.3

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Tomohiro TANIGUCHI, Satoshi YAMASHITA, Ryu YAMAGUCHI, Chungpyo HONG, Yutaka ASAKO Mach number correlation for microchannel gas flow considering temperature decrease International coauthorship

2021.3 JSME

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Event date： 2021.3

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
福田照，板垣慶太，片野田洋，福原稔，洪定杓長い噴射管をもつコールドスプレーノズル内の貯気温度の推算法に関する研究

2016年度日本機械学会年次大会

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Event date： 2016.9

Language：Japanese Presentation type：Oral presentation (general)
平口裕之，片野田洋，福原稔，洪定杓ボルテックスチューブの旋回冷風特性に関する研究

2016年度日本機械学会年次大会

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Event date： 2016.9

Language：Japanese Presentation type：Oral presentation (general)
藤原嵩，福原稔，片野田洋，洪定杓水力輸送特性に及ぼす排砂促進板近傍の粉体流れの可視化（設置深さの影響）

第44回可視化情報シンポジウム可視化情報学会

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Event date： 2016.7

Language：Japanese

Venue：東京

国内学会
福田雅樹，片野田洋，福原稔，洪定杓超小型人工衛星KAT2号機の熱設計についての事後検証

日本機械学会九州支部第69期総会・講演会

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Event date： 2016.3

Language：Japanese Presentation type：Oral presentation (general)
福田照，片野田洋，福原稔，洪定杓コールドスプレーノズルにおける貯気温度低下のメカニズム

日本機械学会九州支部第69期総会・講演会

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Event date： 2016.3

Language：Japanese Presentation type：Oral presentation (general)
Effect of Surface Roughness on Friction Factor of Gas Flow in Micro-tubes

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Event date： 2016.3

Language：Japanese Presentation type：Oral presentation (general)
Semi-local Friction Factors of Gaseous Flow through Glass Micro-tube

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Event date： 2016.3

Language：Japanese Presentation type：Oral presentation (general)
福田雅樹，片野田洋，福原稔，洪定杓超小型人工衛星KSAT2号機のバッテリ温度に関する事後検証

第59回宇宙科学技術連合講演会

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Event date： 2015.10

Language：Japanese Presentation type：Oral presentation (general)
Semi-local Friction Factors of Gas Flow Through Rib-patterned Microchannels

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Event date： 2015.9

Language：Japanese Presentation type：Oral presentation (general)
Total Temperature Measurement of Gas Flow in Micro-tube with Porous Medium

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Event date： 2015.9

Language：Japanese Presentation type：Oral presentation (general)
Effect of Surface roughness on Gaseous Flows through Micro-tubes

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Event date： 2015.9

Language：Japanese Presentation type：Oral presentation (general)
ISHIMURA Ryo, HONG Chungpyo, MURAOKA Koki, ASAKO Yutaka Estimation of surface roughness from friction loss of gaseous flow though stainless steel microtubes International coauthorship

The Proceedings of the Fluids engineering conference 2022 The Japan Society of Mechanical Engineers

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Language：Japanese Presentation type：Oral presentation (general)

Effects of surface roughness on microchannel gas flow are significant since the surface roughness of a microchnnel is relatively large compared to conventional size tubes. Therefore, in this study, the effects of surface roughness on friction factors of nitrogen gas flow through stainless steel microtubes experimentally investigated under atmospheric back pressure and variable inlet pressure. The experiments were carried out with six different diameters stainless steel microtubes whose diameters range from 256 to 867 μm. The average values of Mach number and Fanning & Darcy friction factors between the inlet and outlet considering decrease in gas temperature were obtained from measured stagnation temperatures & pressures and mass flow rates. The effects of surface roughness on the compressibility effect were described with Fanning and Darcy friction factor correlations as a function of Mach number. The arithmetic mean height of the surface (Ra) of the microtube was also measured with a 3D laser scanning confocal microscope for profilometry. Comparing the measured Ra and the equivalent sand grain surface roughness (Ks) determined from Colebrook-White correlation, a correlation between Ra and Ks was obtained.

DOI： 10.1299/jsmefed.2022.os04-16
SASAE Haruki, KAWANO Manato, HONG Chungpyo, ASAKO Yutaka Estimation of temperature recovery factor of turbulent gas flow through a microtube International coauthorship

The Proceedings of the Fluids engineering conference 2022 The Japan Society of Mechanical Engineers

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Language：Japanese Presentation type：Oral presentation (general)

In this paper, a temperature recovery factor defined as the ratio of the actual temperature rise at the wall to the maximum possible temperature rise were estimated from experimentally measured wall temperatures and pressures to determine the velocity and temperature of gas through an adiabatic microtube. The experiments were carried out using two pairs of stainless steel microtubes with D=528.4 and 754.2 μm. One of a pair was tested for measurements of local pressures to obtain local Mach numbers and bulk temperatures. And the other of a pair was tested for measurements of local wall temperatures. The stagnation pressure with the atmospheric back pressure was chosen in such a way that the outlet flow reached sufficiently choked. Local total and bulk temperatures were obtained with total and static enthalpies determined with the measured stagnation & local pressures, stagnation temperatures, mass flow rates by real gas manner. In order to estimate the temperature recovery factor, the measured wall temperature and the obtained total temperature were normalized by bulk temperature and represented as Mach numbers. The estimated values of the temperature recovery factor were independent of the Mach number. The present estimated temperature recovery factor was compared with numerical and experimental ones obtained with the assumption of an ideal gas.

DOI： 10.1299/jsmefed.2022.os04-09

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