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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study of condensation heat transfer for R141b in intermittent flow regime within a smooth horizontal tube
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Experimental study of condensation heat transfer for R141b in intermittent flow regime within a smooth horizontal tube

机译:平滑水平管内间歇流动状态下R141B冷凝热传递的实验研究

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摘要

This study investigates condensation of R141b in an 8 mm ID horizontal smooth tube. Condensation of R141b is conducted at an average saturation temperature of 40 degrees C with mass fluxes ranging from 40 to 400 kg m(-2)s(-1). The plant runs with low vapor quality of refrigerant where intermittent flow is expected to be the dominant flow regime. Visualization images presented for intermittent flow regime. Observation results compared with four types of flow regime map and a modified version of El Hajal-Thome map is presented. Condensation heat transfer coefficient in intermittent zone is evaluated. Comparison between the available experimental data and the values predicted by the most popular and current correlations for condensation heat transfer in horizontal tubes are reported. Finally, a new correlation is proposed to predict condensation heat transfer coefficient within intermittent region.
机译:本研究研究了R141b在8 mm ID水平光滑管中的冷凝。 R141b的缩合在40℃的平均饱和温度下进行,质量助量范围为40-400kg m(-2)s(-1)。 该植物以低蒸气质量的制冷剂延伸,其中间歇流量预计将成为主要的流动状态。 为间歇流状态提供的可视化图像。 观察结果与四种类型的流动制度图和EL Hajal-Thome Map的修改版本相比。 评估间歇区中的冷凝传热系数。 报告了可用实验数据与最流行的净化热传递的最流行和电流相关性的值之间的比较。 最后,提出了一种新的相关性来预测间歇区域内的凝结传热系数。

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