带次流道的周向平行弯曲细通道夹套熵产研究

Entropy Generation Study of Circumferential Parallel Curved Mini-Channel Jacket with Secondary Passages

为探究次流道对周向平行弯曲细通道夹套性能的影响,对有无次流道的周向平行弯曲细通道夹套内流体的层流流动和传热特性进行了三维数值模拟分析。通过对比分析得到如下结果:次流道增加了夹套的平均Nu数;在低Re数时,有次流道夹套的流阻系数f小于无次流道夹套,而当Re数大于1 050时,有次流道夹套的f高于无次流道夹套;有次流道夹套的传热不可逆的熵产率小于无次流道夹套,而2种夹套的流动不可逆的熵产率在低进口Re数时相差不大。次流道强化了夹套的传热性能,且在低Re数时降低了夹套的流动阻力。

A 3-D numerical study is carried out to investigate the laminar fluid flow and heat transfer performance of circumferential parallel mini-channel jacket with / without secondary channels in order to explore the effect of secondary channels on characteristics of different jackets. Some conclusions were obtained by analyzing contrastively numerical simulate results of two different jackets. The secondary channels increased the mean Nu of jacket. The flow resistance f values of jacket with secondary channels were less than ones of conventional jacket at low Re. When Re was greater than1 050,the flow resistance f values of conventional jacket were smaller. The entropy generation rate due to heat transfer irreversibility of jacket with secondary channels was farer more than the one of the conventional jacket. The entropy generation rate due to fluid frictional irreversibility of different jackets with / without secondary channels were near at low Re. The secondary channels enhanced the heat transfer performance of jacket and reduced the flow resistance at the same time at low Re number.