%0 Journal Article
%T 分形树状微通道散热性能的数值研究<br>Numerical Study on Heat Dissipation Performance of Fractal Tree Microchannel
%A 葛秋明
%A 陈正明
%J International Journal of Fluid Dynamics
%P 44-56
%@ 2328-0549
%D 2021
%I Hans Publishing
%R 10.12677/IJFD.2021.93005
%X 仿生分形树状微通道具有速度分布均匀、传热效率高等特点，目前得到广泛的研究。本文在定横截面积和定水力直径的条件下，根据单条微通道进口截面的不同高宽比(0.333、1、2、4)，各构建出4种分形树状微通道，数值研究了不同Re下微通道的传热、流动以及综合性能。研究发现，微通道的Nu和压降ΔP均随着高宽比的增加而增大。但微通道的最高温度T<sub>max</sub>反而随Nu的增加而增加。其中DJM-0.333和DSL-0.333的T<sub>max</sub>最小，具有更好的散热性能。对综合性能进行分析后，发现不同微通道的COP均随Re的增加而减小，DJM-0.333具有最高的COP，而DJM-4 (DSL-4)的COP最小，且前者比后者平均高37%。进一步得出DJM-0.333具有最佳的散热性能。<br />
Biomimetic fractal tree microchannel has been widely studied because of its uniform velocity dis-tribution and high heat transfer efficiency. Under the condition of constant cross-sectional area and hydraulic diameter, four kinds of fractal tree microchannels were constructed according to the dif-ferent aspect ratios (0.333, 1, 2 and 4) of the entrance section of a single microchannel. The heat transfer, flow and comprehensive performance of the microchannel with different Re were numeri-cally studied. The results showed that the Nu and pressure drop ΔP of the microchannel increased with the increment of aspect ratio. However, the maximum temperature T<sub>max</sub> of the microchannel increased with the increase of Nu. Among them, DJM-0.333 and DSL-0.333 had the smallest T<sub>max</sub> and better heat dissipation performance. After analyzing the comprehensive performance, it was found that the COP of different microchannels all decreased with the increase of Re, DJM-0.333 had the highest COP, while DJM-4 (DSL-4) had the lowest COP, and the former is 37% higher than the latter on average. It was further concluded that DJM-0.333 had the best heat dissipation performance.
%K 分形，微通道，高宽比，数值模拟<br>Fractal
%K Microchannel
%K Height-Width Ratio
%K Numerical Simulation
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=44799