不同形状微针肋通道流动与换热性能影响研究

Study on the Flow and Heat-Transfer Properties of Microchannel Heat Sink with Different Pin-Fin Shapes

采用CFD模拟软件,结合实验研究,针对圆形、三角形和方形截面微针肋通道流动与换热进行了三维数值模拟分析.分别模拟了不同雷诺数Re下,三种形状肋片的绕流流场和肋阵温度场分布,并计算摩擦阻力系数f、努谢尔特数Nu等参数评价针肋微通道流动换热性能.结果表明,f随Re的增大而减小,且低Re下,三角形针肋的f最小.Nu随Re的增加而增大.三种形状中,圆形针肋的Nu数最大,换热效果最好.综合流动和换热特性评估,认为圆形针肋比方形和三角形针肋更优.通过实验对比发现,微尺度效应对模拟结果的影响有一定的误差,但是整体趋势与模拟结果一致.

By using the CFDsoftware and combining with experimental studies we conduct the investigation on the characteristics of flowand heat transfer in microchannel heat sink with circular, triangle and squarecross-section pin-fin arrays. The flow field and temperature field of the three types pin-fin Reynolds number（Re）. Besides, the friction coefficient （f） and Nusselt number （Nu） have been calculated as thecriterion of the flowand heat transfer properties of micro pin-fin. The results showthat the friction with the increase of Re that the frictional resistance coefficient of triangle pin-fin is the smallest with low O. And thatthe Ax grows with the increase of Re and the Ax of circular pin-fin is larger than that of triangle or square, which a better heat transfer performance. The assesses of the comprehensive flow and heat transfer performance indicate that thecircular pin-fin has better performance than the others. Furthermore,compared with experimental outcome,the numerical results still have some deviation owing to microscale effect while the trend is consisten