摘要
采用直流电源加热不锈钢管的方式,设置热流密度为31~73 kW/m^(2),质量流速为248~460 kg/(m^(2)·s),研究工质R152a于高蒸发温度为60~80℃时在水平管内的流动沸腾传热特性,并将实验结果与文献报道的3个传热关联式的预测值进行比较。结果表明:工质R152a的流动沸腾传热系数随着蒸发温度的升高而减小,随着干度的变化呈现先减小后增大再减小的趋势,质量流速的变化对流动沸腾传热系数的影响较小;3个传热关联式的预测值与实验值的平均绝对偏差均偏大。
Flow boiling heat transfer characteristics of working medium R152a in a horizontal tube at high evaporation temperature of 60-80 ℃ were studied by the way of heating stainless steel tubes with a direct current source and setting heat flux of 31-73 kW/m^(2) and mass velocity of 248-460 kg/(m^(2)·s). The experimental results were compared with the predicted values of three heat transfer correlations reported in literature. The results show that the flow boiling heat transfer coefficient of working medium R152a decreases with the increase of evaporation temperature, which decreases first, then increases, and then decreases with the change of dryness. The change of mass velocity has little influence on the flow boiling heat transfer coefficient. The average absolute deviations between predicted values of three heat transfer correlations and experimental values are large.
作者
黄计康
罗向龙
夏扬凯
HUANG Jikang;LUO Xianglong;XIA Yangkai(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China)
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2023年第2期207-214,共8页
Journal of University of Jinan(Science and Technology)
基金
国家自然科学基金项目(51736005,51876043)。
关键词
工质
沸腾传热
蒸发温度
传热关联式
working medium
boiling heat transfer
evaporation temperature
heat transfer correlation
