板翅式换热器封条质量对瞬变法配比的影响及其修正

当换热面试件中带有封条或其他必须考虑横向导热效应的材料时,这部分材料的质量是否要计入换热面介质的质量,计入多少,将对现有的瞬变传热试验配比结果产生较显著的影响。本文求得了封条质量修正系数的近似分析解,并给出了修正系数图,可以准确、方便地得到参与换热、需要计入换热面质量的那部分封条质量的份额。对封条质量影响进行实验研究的结果表明,这一封条质量修正的计算方法是可靠的。

THE INFLUENCE OF THE SIDE-BARS OF PLATE-FIN HEAT EXCHANGERS ON TRANSIENT TEST MATCHING AND ITS CORRECTION

Based on the principles of transient test technique, an approximate model of lateral transient heat conduction in the sidebars of a plate-fin heat exchanger is proposed and solved, and the side-bar mass correcting factors are presented in the form of graphs modified side-bar mass is calculated from the correcting factor and is added into the solid mass of the heat transfer surface so that the available transient test techniques in which a homogeneous porous solid material assumption is made are still valid. The results obtained in the experiment show that the present approach is reasoable and simple.