水平光滑细管内R32的冷凝换热特性  

CONDENSATION HEAT TRANSFER CHARACTERISTICS OF R32 IN A HORIZONTAL MINI-CHANNEL

作　　者：王欢[1] 李敏霞[1] 杨英英 马一太[1] 

机构地区：[1]中低温热能高效利用教育部重点实验室,天津大学机械工程学院,天津300072

出　　处：《太阳能学报》2015年第11期2597-2604,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51176133)

摘　　要：对流体R32在内径2mm的水平光滑圆管内的冷凝换热特性进行实验研究。实验设定的流体饱和温度为35、40和45℃，质量流量为100－500kg／（m2·S），热流密度7～28kW／m2。实验获得R32在不同工况下的冷凝换热系数和摩擦压降梯度。发现其换热系数随质量流量增加而增大，随饱和温度提高而减小。入口干度和热流密度对其影响不大。摩擦压降梯度随质量流量增加而增加，相同质量流量下，随饱和温度升高而降低。并将该次实验值与其他经典换热模型和压降模型进行对比分析，发现Baird模型对该次实验的换热系数预测较好，MUller—Heck模型和Chisholm模型对R32的摩擦压降预测较好。The condensation heat transfer coefficients and frictional pressure drops of R32 in a single circular minitube of 2 mm inner diameter were investigated experimentally. The experiment was conducted at saturation temperature of 35, 40 and 45 ℃, mass flux of 100-500 kg/（m2 s） and heat flux of 7-28 kW/m2. The test results showed that the heat transfer coefficients of R32 increase with increasing the mass flux, and decrease with increasing the saturation temperature, and are little influenced by heat flux and inlet vapor quality. Frictional pressure drops of R32 increases with increasing the mass flux, and decreases with increases the saturation temperature. Compared the results with several typical predicted correlations, Baird model can predict the experimental heat transfer coefficients well and Mtiller-Heck model can predict the experimental frictional pressure drop well relatively.

关 键 词：R32 小通道 冷凝换热系数 摩擦压降 水平光滑管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]