不同流动角对变截面双通道内换热特性实验

研究了变截面双通道内肋的角度对通道换热的影响,并且与光滑变截面通道进行了比较.实验模型中,矩形肋对称布置在上下两个表面,肋与来流的角度按两种布置.实验结果表明,带强化肋通道的换热效果比不带肋通道的换热效果增强50%左右;与以往研究结论带有60°平行肋的通道换热效果大于带90°肋的通道的换热效果的结论不同,结果显示,当通道肋高比为0.092时,带有90°平行肋的通道换热效果大于带60°肋的通道的换热效果.

Experimental Study of Heat Transfer Characteristics inside Two-Pass Variable Cross-Section Channels with Different Rib Angles

The effect of the rib-angle orientation on heat transfer distribution was experimentally studied inside twopass variable cross-section channels.The heat transfer distributions for ribbed channels were compared with channels without ribs.Ribs with rectangular crosssection were arranged symmetrically on two opposite walls.Analysis of the experimental results may lead to the following conclusions:the heat transfer effect of the channel with ribs is 50% higher than that of the channel without ribs.The 60° ribs were not necessarily the optimum option as published in the literature.Tests show that 90° ribs produce a higher heat transfer for the relative roughness height of 0.092.