复杂波浪形微通道对流传热和熵产分析

Analysis on Convective Heat Transfer and Entropy Generation in Complex Wavy Microchannels

设计一种在微通道底面中心设置波浪状肋片以及在微通道两侧壁面设置矩形肋片的复杂波浪形微通道(WMC-RP),采用数值方法研究其对流传热和熵产特性。将所得结果与光滑波浪形微通道(WMC-S)、仅带有波浪状肋片的波浪形微通道(WMC-R)和仅带有矩形肋片的波浪形微通道(WMC-P)进行对比。结果表明:在所研究的雷诺数范围内,相较于WMC-S、WMC-R和WMC-P,WMC-RP的摩擦阻力系数平均值分别增大了228.15%、42.96%、98.48%,WMC-RP的努塞尔数平均值分别增大了12.08%、8.42%和35.28%,WMC-RP的熵产增大数平均值分别降低12.72%、4.24%、21.04%,这表明WMC-RP的换热效果好、能量利用率最高。

A complex wavy microchannel with the wavy fins on the bottom wall center and the rectangular fins on the double sidewalls was designed,and its convective heat transfer and the entropy generation were analyzed by using numerical simulation method.The results were compared with those of the smooth wavy microchannel(WMC-S),the wavy microchannel with wavy fins(WMC-R)and the wavy microchannel with rectangular fins(WMC-P).The results show that at the range of Reynolds number studied,compared with WMC-S,WMC-R and WMC-P,the average value of friction factor in WMC-RP increases by 228.15%,42.96%and 98.48%respectively,the average value of Nusselt number in WMC-RP increases by 12.08%,8.42%and 35.28%respectively,the average value of entropy generation in WMC-RP decreases by 12.72%,4.24%and 21.04%respectively,which indicate that WMC-RP has the best heat transfer effect and the highest energy utilization efficiency.