水平细圆管内非共沸混合工质的流动沸腾  

Flow boiling heat transfer of non-azeotropic refrigerant mixtures in horizontal mini-scale tube

作　　者：胡自成[1] 马虎根[2] 宋新南[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]上海理工大学动力工程学院,上海200093

出　　处：《化工学报》2006年第11期2577-2581,共5页CIESC Journal

基　　金：上海市高等学校科学技术发展基金项目(01F09);上海市市重点学科资助项目.~~

摘　　要：以非共沸混合工质R32/R134a为实验工质,进行了水平细圆管内流动沸腾换热实验.在获取大量实验数据的基础上,分析了质量干度、热通量和质量通量密度对沸腾换热的影响,讨论了各种工况下的换热机理,比较分析了细圆管和常规管道内流动沸腾换热性能.实验结果表明:在本实验范围内,水平细圆管内流动沸腾换热主要受热通量的影响,绝大部分实验工况下核态沸腾占主导地位.尺度效应是引起微细通道内流动沸腾换热特性不同于常规管道的主要原因.Experiments were conducted to investigate forced flow boiling heat transfer of non-azeotropic refrigerant mixtures of R32 and R134a in a horizontal mini scale tube. The dependence of heat transfer coefficient on mass quality, heat flux and mass flux was analyzed and the heat transfer mechanism under each working condition was discussed. The forced flow boiling heat transfer in the mini-scale tube and large-scale tube was compared and discussed. The results showed that mass quality and mass flux had nearly no effect on forced flow boiling heat transfer, but heat flux affected heat transfer greatly and nucleation boiling heat transfer played an important role in most of the mass quality range. Only when heat flux was very low, mass flux and mass quality had some effect on forced flow boiling heat transfer and forced convective heat transfer dominated. Compared with the large-scale tube, fully suppressed nucleate boiling was not observed and heat transfer mechanism was dominated by nucleation boiling in the miniscale tube due to size effect.

关 键 词：细圆管 流动沸腾 非共沸混合工质 尺度效应 

分 类 号：TK124[动力工程及工程热物理—工程热物理]