Application of "Vapor-phase Resistance Method"to the Study of Condensation inHorizontal Tubes

Huang Hongding and Lu Wei(Chemical Engineering Department; Tianjin University)

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Application of "Vapor-phase Resistance Method"to the Study of Condensation inHorizontal Tubes

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- Application of "Vapor-phase Resistance Method"to the Study of Condensation inHorizontal Tubes
- CIESC Journal Issue 2, (1987)
- 作者机构：
  
  天津大学化工系,天津大学化工系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 June 1987，
  
  Published：25 June 1987
- 稿件说明：
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Huang Hongding and Lu Wei(Chemical Engineering Department, Tianjin University). Application of "Vapor-phase Resistance Method"to the Study of Condensation inHorizontal Tubes[J]. CIESC Journal, 1987, (2).
DOI：

Huang Hongding and Lu Wei(Chemical Engineering Department, Tianjin University). Application of "Vapor-phase Resistance Method"to the Study of Condensation inHorizontal Tubes[J]. CIESC Journal, 1987, (2). DOI：

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%.

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%.

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