水平管内流动沸腾的热进口效应  

Heat entrance effects' of flow boiling in horizontal tube

作　　者：张小力[1] 蔡祖恢[1] 伍贻文[1] 

机构地区：[1]华东工业大学动力工程学院,上海第一冷冻机厂开利空调设备有限公司

出　　处：《华东工业大学学报》1996年第1期17-22,共6页

基　　金：国家自然科学基金

摘　　要：通过实验结果讨论、文献数据分析及实验关联式同实验数据的比较，证实了在水平管内流动沸腾中存在热进口效应．研究表明：水平管内流动沸腾的热进口效应随ｑ、Ｘ、Ｇ的变化而改变，并且热进口段长度要比单相液体在管内流动换热时长．最后，推荐Ｄｅｍｂｉ．关系式作为目前计算水平管内流动沸腾热进口段平均换热系数的关系式．An experimental study is reported on flow boiling heat hansfer of HFC-134a in the entrance section of horizontal smooth tube. The experimental data have been discussed,and a comparison has been made between experimental data obtained and heat transfer correlations. It is found that the heat entrance effects exist in horizontal flow boiling. The analysis shows that heat entrance effect changes with mass rate, quality and heat flux. The heat entrance length is longer than that of single phase flow. The Dembi correlation is proposed to calculatc the average heat transfer coefficient at entrance section.

关 键 词：热进口效应 流动沸腾 水平管 

分 类 号：TB611[一般工业技术—制冷工程]