HC290含油工质在水平微肋管内沸腾换热特性及压降的实验研究  

An Experimental Investigation on Evaporation Heat Transfer and Pressure Drop of

作　　者：严嘉[1] 童明伟[1] 杨鹏[1] 

机构地区：[1]重庆大学动力工程学院,重庆400044

出　　处：《制冷学报》2005年第1期5-10,共6页Journal of Refrigeration

摘　　要：实验测试了HC2 90 -Suniso 3GS混合工质在含油浓度为 0 .4 3%～ 5 .2 8%、质量流率为 4 0kg/m2 ·s～ 2 2 0kg/m2 ·s,蒸发温度分别为 - 5℃、0℃、+5℃时在水平微肋管内的沸腾换热特性及压降。蒸发试验段为一套管蒸发器 ,有效长度为 2 .0m ,内管为内肋强化管 ,其外径为 12 .7mm ,最大内径为 11.4 4mm ,T型肋高 0 .2 5mm ,螺旋角 2 0° ,肋数为 6 0 ;外套管是一光滑铜管 ,其内径为 19mm。实验结果表明含油工质沸腾平均换热系数随工质质量流率、干度的增大而增加 ,随含油率的增大而降低 ,蒸发温度对其影响不大 ;压降随其质量流率的增大而增大 ,与光管相比其压降随质量流率的增大要更快 ,润滑油的加入对压降影响不大。通过测试沸腾换热特性所得的 4 0多个实验数据点 ,回归出了适用于本实验条件的经验关联式。Heat transfer coefficients and pressure drop were experimentally determined for a horizontal micro-fin tube (2m in length, 11.44mm ID) with HC290-oil mixtures. The oil was Suniso 3GS. The oil concentrations ranged from 0.43%-5.28%. The micro-fin tube was a internally enhanced tube, which has 60 T-style fins with a height of 0.25mm and 20° spiral angle. The evaporation temperatures were at -5℃, 0℃, 5℃, respectively, and the refrigerant mass flux was ranged from 40kg/m 2·s to 220kg/m 2·s. The results show that the mean evaporation heat transfer coefficients on the test section increased as the mass flux and quality of vapour-liquid mixture increased, but decreased as the oil concentrations were increased and evaporation temperature had negligible effect on the heat transfer coefficients. Moreover, the pressure drop on the test section increased as the mass flux of mixture increased, and it increased more quickly than that of smooth tube, but the quality of oil had negligible effect on the pressure drop. In addition, a correlation achieved agrees well with the heat transfer coefficient experimental data.

关 键 词：沸腾换热 微肋管 HC 混合工质 压降 换热系数 干度 质量流 蒸发温度 关联式 

分 类 号：TB651[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理]