竖直矩形窄通道内水流动沸腾起始点及壁面温度实验研究  

Experiment study on water flow boiling heat transfer characteristics in vertical narrow rectangular channel

作　　者：郑志皋[1] 陶乐仁[1] 黄理浩[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《低温工程》2013年第6期1-4,20,共5页Cryogenics

基　　金：国家高科技研究发展计划项目(2008AA05Z204)

摘　　要：建立单面加热垂直矩形窄通道流动沸腾换热实验装置,针对截面250 mm×3.5 mm的窄缝通道,对水流动沸腾换热特性进行实验研究。通过实验分析可知:(1)饱和沸腾起始点是核态沸腾的开始,以此为分界,窄通道内的换热特性截然不同。影响沸腾起始点的因素主要有3种:热流密度、质量流量及入口温度。(2)流体从单相流、过冷沸腾和饱和沸腾转变,其壁面温度变化也各不相同。流体处于单相流时,壁面温度沿流动方向呈线性增加;流体处于过冷沸腾阶段时,过冷沸腾对壁面温度的影响不大,壁面温差很小,可近似认为此阶段为等壁温换热过程。流体进入饱和沸腾(饱和核态沸腾和流动沸腾),壁温存在最大值。A single-side heating apparatus was set up to study the flow boiling and heat transfer in verti- cal narrow rectangular channel. Experiment research on flow boiling and heat transfer characteristics in a vertical narrow rectangular channel with the section of 250mm x 5mm was carried out. Experimental analysis indicate that saturated boiling starting point is the start of the nucleate boiling, and before and after this point, the heat transfer characteristics is very different in narrow channel. The main factors which influence boiling starting point are heat flux, mass flow rate and inlet temperature. Fluid experiences from single- phase flow, sub-cooled boiling and saturated boiling, the wall temperatures are different. In single phase flow, the wall temperature increases linearly along the flow direction. In sub-cooled boiling, flow has little influence on wall temperature, the wall temperature difference is small. This stage can be thought as heat transfer process at the same wall temperature. When in saturated boiling（ saturated nucleate boiling and flow boiling） , the wall temperature exists a maximum value.

关 键 词：窄通道 流动沸腾 沸腾起始点 壁面温度 

分 类 号：TB663[一般工业技术—制冷工程]