A new equivalent Reynolds number model for condensation in smooth tubes

被引:166
作者
Moser, KW [1 ]
Webb, RL
Na, B
机构
[1] Penn State Univ, Dept Mech Engn, University Pk, PA 16802 USA
[2] LG Elect Inc, Changwon, South Korea
来源
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME | 1998年 / 120卷 / 02期
关键词
condensation;
D O I
10.1115/1.2824265
中图分类号
O414.1 [热力学];
学科分类号
摘要
In 1959, Akers et al. developed an in-tube condensation model, which defines the all-liquid flow rate that provides the same heat transfer coefficient as an annular condensing flow. This liquid flow rate was expressed by an "equivalent" Reynolds number and used in a single-phase, turbulent flow equation to predict the condensation coefficient. However, the assumptions on which the equivalent Reynolds number is based are shown in the present work to be faulty. This results in the underprediction of many researchers' data. A new equivalent Reynolds number model, based on the heat-momentum analogy, is developed in this study. This model is then shown to predict the experimental Nusselt number of 1197 data points from 18 sources with an average deviation of 13.64 percent. The data are for tube internal diameters between 3.14 and 20 m.m.
引用
收藏
页码:410 / 417
页数:8
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