对不同质量分数下非共沸混合工质(R134a/R32)在微尺度管道内的流动沸腾换热特性进行了比较和分析,阐述了热流密度、质量流量和质量干度对换热的影响。结果表明:热流密度对换热的影响随着质量流量的增加而愈加明显;在质量分数为75%/25%和65%/35%时,换热系数随着质量流量的增大而增大;而质量分数为85%/15%时,换热系数随质量流量的变化先增加后减小;随着质量干度的增加,换热系数在各质量分数下基本上都呈上升趋势。 The flow boiling heat transfer characteristics of non-azeotropic mixtures (R134a / R32) with different mass fractions in micro-scale pipes were compared and analyzed. The effects of heat flux, mass flow rate and mass dryness on heat transfer were discussed. The results show that the effect of heat flux on heat transfer is more obvious with the increase of mass flow rate. When the mass fraction is 75% / 25% and 65% / 35%, the heat transfer coefficient increases with mass flow rate ; While the mass fraction of 85% / 15%, the heat transfer coefficient first increases and then decreases with the change of mass flow rate; with the increase of the quality dryness, the heat transfer coefficient basically shows an upward trend under each mass fraction.