Laminar heat transfer characteristics in entry region in micro-channels

作者：Zhang Tiantian; Jia Li^*; Yang Lixin

来源：Progress in Computational Fluid Dynamics, 2010, 10(3): 177-185.

• microchannel
• numerical simulation
• thermal boundary layer
• entrance effect
• heat transfer
• thermal entry length

Heat transfer characteristics in entry region of microchannels are numerically investigated. It is found that the temperature gradient near the walls is very large. Thermal entry length in microchannels is much larger than that in conventional channels. Theoretical analysis is given to explain them. We found entrance effect is a key factor that results in the incompatible conclusion that is obtained in the available literatures. The explanation is given in details. Also the effects of Reynolds number, hydrodynamic diameter, length diameter ratio, height-to-width ratio and wall temperature on thermal entry length were analysed. The correlation among these parameters is established.

• 出版日期2010
• 单位北京交通大学