Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2014, Vol. 25 ›› Issue (4): 040601 doi: 10.13538/j.1001-8042/nst.25.040601

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

The flow characteristics of fluid in micro-channels of different shapes

WU Ge-Ping, WANG Jun, LU Ping   

  1. 1School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
  • Contact: WU Ge-Ping
  • Supported by:

    Supported by National Natural Science Foundation of China (No. 51106067), China Postdoctoral Science Foundation (No. 2012M511212) and Foundation of Priority Academic Program Development of Jiangsu Higher Education Institutions

WU Ge-Ping, WANG Jun, LU Ping . The flow characteristics of fluid in micro-channels of different shapes.Nuclear Science and Techniques, 2014, 25(4): 040601     doi: 10.13538/j.1001-8042/nst.25.040601


In this paper, we study hydrodynamics and thermal behaviors of micro-heat exchanger of different cross sections, with hydraulic diameters (Dh) of 0.4–0.8mm and Reynolds numbers (Re) of 300–900. Validity of the model is proved by comparing simulation results based on classical Navier-Stokes equations with experimental data and Tuckerman correlation. Effects of dynamic viscosity, hydraulic diameter, Reynolds number and cross section of the micro-channels are investigated. The results indicate that the variable viscosity effect should be taken into account, and rod bundle micro-channels have the highest heat transfer coefficient of the three types of micro-channels.

Key words: Non-uniform heating, Variable viscosity effect, Po number, Thermal efficiency