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对R290制冷剂在微细通道内的流动沸腾换热特性进行了实验研究。研究管径分别为1和2 mm,热流密度为20~65 k W/m~2,质量流率为100~200 kg/m~2·s,饱和温度为15和25℃,干度范围为0.1~0.9。通过实验数据分析管径、热流密度、质量流率、饱和温度对流动沸腾换热的影响。结果表明:随着管径的下降,换热系数呈现出大幅上升的趋势,其平均增幅为31%;随着热流密度的上升,换热系数呈现出大幅上升的趋势,其平均增幅达到了131%;随着质量流率的上升,换热系数呈现出小幅上升的趋势,其平均增幅为14%;随着饱和温度的上升,大部分换热系数呈现出小幅上升的趋势,其平均增幅为12.6%。
The flow boiling heat transfer characteristics of R290 refrigerant in the microchannels were experimentally studied. The study pipe diameters were 1 and 2 mm respectively, the heat flux was 20 ~ 65 k W / m ~ 2, the mass flow rate was 100 ~ 200 kg / m ~ 2 · s, the saturation temperature was 15 and 25 ℃, 0.1 ~ 0.9. The effects of tube diameter, heat flux, mass flow rate and temperature on the flow boiling heat transfer were analyzed by experimental data. The results show that with the decrease of the pipe diameter, the heat transfer coefficient shows a significant increase, with an average increase of 31%. With the increase of heat flux density, the heat transfer coefficient shows a significant increase, with an average increase of 131% %. With the increase of mass flow rate, the heat transfer coefficient showed a slight upward trend, with an average increase of 14%. With the increase of the saturation temperature, most of the heat transfer coefficients showed a slight upward trend with an average increase of 12.6%.