摘要
研究了Ｒ１３４ａ、Ｒ１４２ｂ在光滑管和机械加工表面多孔管水平管外的池沸腾换热性能，分析了工质在水平管外的沸腾传热机理，实验的对比压力Ｐ／Ｐｃ＝０．２０。实验结果表明，光滑管外沸腾实验结果与取平均表面粗糙度为２μｍ的Ｇｏｒｅｎｆｌｏ公式预测结果吻合较好，与光滑管相比，机械加工表面多孔管能显著地强化沸腾传热，且随着热流密度的增加，强化倍率减小。通过数据拟合，得到了沸腾换热系数的经验关系式。
An experimental investigation on nucleate pool boiling heat transfer of refrigerants outside horizontal plain and E tube has been carried out and the heat transfer mechanism was discussed.The refrigerants are R134a and R142b at normalized saturation pressure P/P c =0 20.For the plain tube,the present data of R134a and R142b are coincided well with Gorenflo correlation for surface roughness 2μm.Compared with plain tube,the machime processed porous tube shows considerable enhancement effect.And the enhancement rate decreases with increasing heat flux.The correlations of boiling heat transfer coefficients are obtained.
出处
《制冷学报》
CAS
CSCD
北大核心
1997年第3期6-11,共6页
Journal of Refrigeration
基金
广东省自然科学基金
关键词
池沸腾
传热系数
CFCc
替代物
制冷剂
Pool boiling Heat transfer coefficient CFC S Alternatives,Refrigerants.
