中文摘要：

本文研究了CO2／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—15kW／m2，质量流速200-400kg／（m2s）。结果表明；CO2／丙烷混合工质的换热系数，介于两种纯净物即CO2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。

英文摘要：

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.