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首页> 外文期刊>International Journal of Heat and Mass Transfer >Steam condensation in horizontal and inclined tubes under stratified flow conditions
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Steam condensation in horizontal and inclined tubes under stratified flow conditions

机译：在分层流动条件下水平和倾斜管中的蒸汽冷凝

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摘要

In this study, an experiment on condensation heat transfer was conducted to develop a condensation model considering the structure of separated flow patterns. Multidimensional local condensation heat transfer parameters were measured in pure saturated steam at pressures of 1-5 bar and mass fluxes of 10-50 kg/m(2) sin an inclinable tube with an inner diameter of 40 mm and a length of 3 m. A heat partition angle, which separated the upper and lower heat transfer areas for film condensation and convective heat transfer in stratified flow, was obtained based on the inflection point of the circumferential distribution function of local heat flux. A new condensation heat transfer model consisting of the heat partition angle and heat transfer coefficient correlations was developed based on the local heat transfer data. The experimental data for model development were obtained using circular tubes with inner diameters of 30-45 mm and inclination angles of 0-10 degrees under pure saturated steam conditions at pressures of 1-67 bar and mass fluxes of 10-329 kg/m(2) s. The model predicted the average heat transfer coefficient with an average deviation of 6.2% against the present experimental data. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在该研究中，考虑到分离的流动模式的结构，进行了对冷凝传热的实验以开发冷凝模型。在1-5巴的压力下在纯饱和蒸汽中测量多维局部缩合传热参数，并为10-50kg / m（2）锡的质量助熔剂，其内径为40mm，长度为3μm。基于局部热通量的圆周分布函数的拐点，获得分离用于膜凝结和对流传热的上部和下部传热区域的热分隔角。基于局部传热数据开发了一种由热分区角度和传热系数相关性组成的新的冷凝传热模型。使用30-45mm的内径为30-45mm的圆形管获得模型开发的实验数据，并且在纯饱和蒸汽条件下在1-67巴的压力下倾斜角度为0-10度，并为10-329kg / m的质量助熔剂（ 2）s。该模型预测平均传热系数，其平均偏差为6.2％，与本实验数据相比。 （c）2019 Elsevier Ltd.保留所有权利。

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