水平微肋管内R245fa沸腾换热及压降的实验研究(英文)

被引:3
|
作者
王志奇 [1 ]
贺妮 [1 ]
夏小霞 [1 ,2 ]
刘力文 [1 ]
机构
[1] School of Mechanical Engineering Xiangtan University
[2] School of Energy Science and Engineering Central South University
基金
中国国家自然科学基金;
关键词
沸腾传热; 摩擦压降:预测关联式; 微肋管; R245fa流体;
D O I
暂无
中图分类号
TK172.4 [热管];
学科分类号
080702 ;
摘要
本文对R245fa在7 mm水平微肋管内的沸腾传热特性和摩擦压降特性进行了实验研究。结果表明,在流动沸腾传热特性方面,沸腾传热系数(HTC)随着R245fa质量速度的增加而增大,随着饱和温度和热流密度的增加而减小。随着干度的增加,HTC存在最大值,对应的干度约为0.4,其值随工作条件的变化而变化。当干度大于过渡点时,较高的质量速度或较低的饱和温度下可以显著增加HTC。在所选四个关联式中,KANDLIKAR的预测值与91.6%实验值的偏差在±25%以内,绝对平均误差为11.2%。此外,关于流动沸腾的摩擦压降特性,本研究结果表明,摩擦压降随着R245fa的质量速度和热流密度的增加而增加,随着饱和温度的升高而减小。在四种常用的关联式中,MULLERSTEINHAGEN-HECK对R245fa摩擦压降值的预测最准确,预测值与84.1%的实验值偏差在±20%以内,绝对平均误差为10.1%。
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页码:3200 / 3212
页数:13
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