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化工学报  2014 

水平光滑细管内R32冷凝换热的流型特性

DOI: 10.3969/j.issn.0438-1157.2014.02.011, PP. 445-452

Keywords: R32,流动,凝结,传热,小通道,水平光滑管

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Abstract:

采用可视化的方法,对流体R32在内径2mm的水平光滑圆管内冷凝换热的流型进行了观测实验,实验设定的流体饱和温度为40℃,质量流量分别为100、200、400kg·m-2·s-1。观测到的主要流型为塞状流、弹状流、环波状流和环状流。通过实验观察,发现随着流量的增加环状流的流型区域增加,流型由环波状流转换成间歇流的干度推迟,其分界线为一条斜线,主要是由于随着流量的增大,气液表面剪切力增大促进了环波状流的形成。借鉴量纲1准则数提出间歇流与环波状流分界线公式。将实验值与其他5种流型模型进行了对比分析,发现只有与Yang-Shieh模型比较吻合。

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