CO2／丙烷混合工质水平管内流动沸腾换热特性研究  

Experimental Studies on Flow Boiling Heat Transfer of R744/R290 Mixtures in a Horizontal Tube

作　　者：吴晓敏[1] 赵然[1] 魏兆福[1] 黄秀杰[1] 王维城[1] 

机构地区：[1]清华大学热能工程系 热科学与动力工程教育部重点实验室 二氧化碳资源化利用与减排技术北京市重点实验室,北京100084

出　　处：《工程热物理学报》2013年第4期706-709,共4页Journal of Engineering Thermophysics

基　　金：国家973计划资助项目(No.2010CB227305)

摘　　要：本文研究了CO_2/丙烷混合工质的流动沸腾换热特性,实验段为内径2mm的水平光管。实验条件为:混合物中丙烷质量分数0%～100%,初始蒸发温度0～10℃,热流密度5～15 kW/m^2,质量流速200～400 kg/(m^2s)。结果表明:CO_2/丙烷混合工质的换热系数,介于两种纯净物即CO_2和丙烷之间,并随着混合物中丙烷含量的增加而减小;初始蒸发温度、热流密度或质量流速的增加均能引起换热系数的增加;对应蒸干现象的临界干度随混合工质中丙烷含量增加而增大,且蒸干会被较低的初始蒸发温度、较低的热流密度和较高的质量流速所抑制。Experimental studies on flow boiling heat transfer performance of R744/R290 mixtures in a 2 mm diameter horizon stainless steel tube, with R744 mass fraction ranging from 0 to 100%, evaporation temperatures from 0 to 10℃, heat fluxes from 5 to 15 kW/m2 and mass fluxes from 200 to 400 kg/m2 s, were conducted in this paper. The results showed that the flow boiling heat transfer coefficients of R744/R290 mixtures are between those of the two pure refrigerants, and gets larger with larger R744 mass fraction, higher evaporation temperatures, larger mass and heat fluxes; drying out is delayed by lower evaporation temperatures, smaller heat fluxes, and larger mass fluxes and mass fraction of R290.

关 键 词：CO2 丙烷 混合工质 水平管 流动沸腾 

分 类 号：TK124[动力工程及工程热物理—工程热物理]