【摘要】 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.更多还原

【Abstract】 By using the CFD software and combining with experimental studies we conduct the three-dimension numerical investigation on the characteristics of flow and heat transfer in microchannel heat sink with circular,triangle and square cross-section pin-fin arrays. The flow field and temperature field of the three types pin-fin arrays are obtained for different Reynolds number( Re). Besides,the friction coefficient( f) and Nusselt number( Nu) have been calculated as the criterion of the flow and heat transfer properties of micro pin-fin. The results show that the friction coefficient decreases with the increase of Re,that the frictional resistance coefficient of triangle pin-fin is the smallest with low Re. And that the Nu grows with the increase of Re,and the Nu of circular pin-fin is larger than that of triangle or square,which appears a better heat transfer performance. The assesses of the comprehensive flow and heat transfer performance indicate that the circular 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 consistent with experimental results.更多还原