高阻塞比肋化通道对流换热特性实验研究

Experimental Investigation on Convective Heat Transfer Characteristics of High Blockage Ribs Channel

采用实验方法对高阻塞比肋化通道的对流换热特性进行了研究。实验的Re数为1400~4500,肋高(e)和通道水力直径(H)的比值(e/H)为0.2和0.33,肋间距(S)与肋高(e)的比值(S/e)为5,10和15。肋化通道中的肋有顺排和叉排两种排列形式。研究结果表明:(1)随着阻塞比和Re数的增加,对流换热系数逐渐增大,但相应的流动损失亦不断升高。(2)无论是顺排还是叉排肋化通道,在肋间距比分别为5,10和15三种情况下,间距比为10的对流换热系数和流阻损失均高于其它两种情况。(3)在实验几何参数范围内,顺排肋化通道的对流换热系数和流动压损均高于叉排通道。

The convective heat transfer characteristics on high blockage ribs channel are measured by experimental method. Reynolds number studied in this experiment is from 1400 to 4500. The rib height（e）to hydraulic diameter（H）ratios are 0.2 and 0.33,respectively. The rib spacing（S）to rib height（e）ratios（S/e）are 5,10 and 15. The rib orientations in the ribs channel are symmetric and staggered arrangement. The experimental results show that：（1）The convective heat transfer coefficients increased with the increase of rib height and Reynolds number,though at the cost of higher pressure losses.（2）When the rib spacing to height ratio（S/e）is 10,it keeps a highest heat transfer coefficient and flow pressure loss in three kinds of rib spacing to height ratio 5,10 and 15.（3）The convective heat transfer coefficient and flow pressure loss in symmetric arrangement ribs channel are higher than that in the staggered arrangement ribs channel.