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Heat transfer coefficient and cross-sectional flow structure in condensation of steam in an inclined tube at a low mass flux
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2021-04-05 , DOI: 10.1016/j.expthermflusci.2021.110414
Andree Pusey , Dahui Kwack , Hyungdae Kim

Condensation of steam at a low mass flux inside an inclined tube was experimentally investigated to aid the optimal design of air-cooled passive heat exchangers for advanced LWRs. While varying downward inclination angle from 0 to 90°, the heat transfer coefficient monotonically improved by more than 15% while previous studies that have used refrigerants have reported that the optimal angle is between 15 and 30°. To interpret the conflicting trends observed, the cross-sectional structures of the condensing flow were visualized. Stratified flow was the only type of flow noted; there was no transition to the annular flow typically observed during two-phase flow of refrigerants in a vertical tube. The observed variation in the condensation heat transfer of steam at low mass flux, with respect to the extent of downward inclination, was well predicted by a mechanistic condensation model for stratified flow that incorporates the cross-sectional stratification angles of condensates.



中文翻译:

低质量通量下倾斜管中蒸汽凝结的传热系数和截面流动结构

实验研究了低质量通量下的蒸汽在倾斜管内的冷凝,以帮助优化用于高级轻水堆的空冷无源热交换器的设计。在向下倾斜角度从0到90°变化的同时,传热系数单调提高了15%以上,而以前使用制冷剂的研究报告说,最佳角度在15和30°之间。为了解释观察到的冲突趋势,将冷凝流的横截面结构可视化。分层流是唯一注意到的流类型。在垂直管中制冷剂的两相流动期间,通常没有观察到向环形流动的过渡。相对于向下倾斜的程度,在低质量通量下观察到的蒸汽冷凝水传热的变化,

更新日期:2021-05-02
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