Experiments on Measurement of Heat Transfer Rate of Gas Flow Through Microchannel with Constant Wall Temperature

Chungpyo Hong; Yutaka Asako; Mohammad Faghri; Danish Rehman; Gian Luca Morini

Authors

Chungpyo Hong Department of Mechanical Engineering, Kagoshima University, Kagoshima 890-8580, Japan
Yutaka Asako Department of Mechanical Precision Engineering, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, 54100 Kuala Lumpur, Malaysia
Mohammad Faghri Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island Kingston, RI 02881, USA
Danish Rehman Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island Kingston, RI 02881, USA
Gian Luca Morini Department of Industrial Engineering, University of Bologna, Via del Lazzaretto 15/5, 40131 Bologna, Italy

Keywords:

Heat transfer rate, gas flow, convective heat transfer, total enthalpy and temperature, microtube

Abstract

Experimental results for the measurement of heat transfer rates in microchannel gas flow are crucial for gas to gas micro heat exchangers. A critical overview of the main factors that play an important role in the determination of heat transfer rate is presented. The experimental and numerical data obtained from authors’ previous studies are used in order to highlight the characteristics of convective heat transfer of gas through microchannels with constant wall temperature. It is suggested to obtain heat transfer rates by determining the difference between the gas enthalpy at the inlet and outlet by measuring local temperature and pressure. The heat transfer rates obtained in the present study were compared with those determined by the difference in total temperatures and incompressible flow Nusselt number.