Local Heat Transfer Coefficients for Condensation in Stratified Countercurrent Steam-Water Flows
Local Heat Transfer Coefficients for Condensation in Stratified Countercurrent Steam-Water Flows
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DOI：
10.1115/1.3245652
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发表时间：
1983-11
影响因子：
--
通讯作者：
Hyo Kim;S. Bankoff
中科院分区：
文献类型：
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作者：
Hyo Kim;S. Bankoff
在与水平面成33 °角的矩形通道内，对蒸汽和过冷水逆流分层流动中的蒸汽凝结进行了研究。该实验中的变量是入口水和蒸汽流速以及入口水温度。冷凝传热系数被确定为当地蒸汽和水的流量，和过冷度的函数。相关性给出了当地努塞尔数的光滑和粗糙的界面制度，也为无量纲波的振幅。还开发了一个以服从性为中心的模型。结果表明，可以得到更好的协议与数据，如果在湍流努塞尔数和雷诺数的特征尺度与测得的界面参数，而不是整体流动参数。界面剪切的重要影响，失踪在以前的涡输运模型，因此隐含。
A study of steam condensation in countercurrent stratified flow of steam and subcooled water has been carried out in a rectangular channel inclined 33 deg to the horizontal. The variables in this experiment were the inlet water and steam flow rates, and the inlet water temperature. Condensation heat transfer coefficients were determined as functions of local steam and water flow rates, and the degree of subcooling. Correlations are given for the local Nusselt number for the smooth and for the rough interface regimes, and also for the dimensionless wave amplitude. A turbulence-centered model is also developed. It is shown that better agreement with the data can be obtained if the characteristic scales in the turbulent Nusselt number and Reynolds numbers are related to measured interfacial parameters rather than the bulk flow parameters. The important effect of interfacial shear, missing in previous eddy-transport models, is thus implicitly included.