矩形微槽道饱和沸腾临界热流密度特性  

Properties of saturated flow boiling critical heat flux through rectangular micro-channel

作　　者：罗小平[1] 唐杨[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640

出　　处：《低温与超导》2010年第6期66-70,共5页Cryogenics and Superconductivity

基　　金：国家自然基金项目(20676039)资助

摘　　要：对矩形微槽中的流动沸腾临界热流密度进行了实验研究。研究CHF随质量流速、进口过冷度和出口干度的增加而出现的变化趋势,以及槽道尺寸对CHF的影响。搭建试验平台,在不同槽道当量直径、较大范围的质量流速和不同进口过冷度条件下,获得以去离子水为工质两相沸腾传热的实验数据。由于常规尺寸槽道CHF预测关联式并不具有普遍性,所以提出了一个适用于微槽道饱和沸腾CHF的预测模型。并通过与该文以及参考文献中实验数据进行对比,验证了该模型的适用性。Extensive experimentation was performed in rectangular microchannels to obtain the flow boiling critical heat flux （CHF）. Two - phase boiling heat transfer was in microchannels ranging from three kinds of diameters over a wide range of mass fluxes and inlet subcoolings, for detain - water as working fluids. The effect of different operating parameters - mass flux, inlet subcoolings, exit quality and diameter were assessed in detail and compared with other mierochannels data from literature. There was a characteristic sharp rise in wall temperature at the point of CHF. CHF generally refered to the outcome of events that cause a sudden, appreciable decrease in the heat transfer coefficient for a surface on which boiling was occurring. The results was analysed for reseaching CHF increases monotonically with increasing G, inlet temperature, exit quality and diameters. A new model to predict saturated CHFconditions in microchannels was introduced. The experimental data in literature and this study obtained from miniehannels and mierochannels were used to test the model.

关 键 词：矩形微槽道 临界热流密度 去离子水 饱和沸腾 预测模型 

分 类 号：TK124[动力工程及工程热物理—工程热物理]