载气汽油在水平螺旋扁管管束外的沸腾换热

Boiling heat transfer of gasoline-air mixtures outside horizontal spiral-flat tubes

以汽油-空气为介质,在不凝性气体质量含量不超过5%时,分别对导程为200mm、300mm和400mm的螺旋扁管管束外的沸腾换热进行了实验研究,分析了沸腾换热系数随两相质量流量和导程的变化规律。结果表明在一定的汽油质量流量下,沸腾换热系数随质量含气率的增大而降低,而随汽油质量流量的不同,沸腾换热系数的主要影响因素有所不同。并且拟合得到了相关条件下,载气汽油在3种不同导程的螺旋扁管管束外的沸腾强化换热实验关联式。

An experimental investigation for boiling heat transfer of gasoline-air mixtures outside horizontal spiral-flat tubes of different pitch was carried out with incondensable gas content of less than 5%. Results showed that the boiling heat transfer coefficient decreases as the increase in incondensable gas content,and the main factors differs as the gasoline mass flow changes. Finally,an experimental correlation for boiling heat transfer coefficient was established.