Abstract: A physical model as well as a mathematical model were established to describe and upgrade the "vapor-phase resistance method" suggested by Bell and Ghaly. Considering the effects of ripples at interfaces on vapor-phase resistance, a correction factor Vr was proposed. Another factor (θ/π)β which corrects the influence of the liquid pool along the bottom of the horizontal tube on the liquid-phase heat transfer coefficient was derived and therelationship of θ and β was correlated. A fully established method for calculating the convective condensation heat transfer coefficient was proposed. The heat transfer coefficients predicted by Bells method are approximately 10-15% lower than experimental values as the effect of ripples on vapor-phase resistance was not taken into account. Comparison of the predicted values of he from the modified vapor-phase resistance method with experimental data showed a deviation of ±10%.

摘要： 建立了一个简明的物理模型及数学模型;对Bell和Ghaly的汽相热阻法作了一些补充和阐述.提出界面波纹对汽相热阻影响的修正因子V_r;推导出水平管内液池覆盖面积对液相传热系数影响的修正因子(θ/π)β,并拟合出β—θ的关联式.提出一个完整的对流冷凝传热系数h_c的计算方法.实验数据表明Bell法偏低约10—15%,其原因是未考虑波纹对汽相热阻的影响.修正后的汽相热阻法计算的h_c值与实验结果相差±10%.