矩形通道干涸后膜态沸腾传热试验研究

Experimental Study on Post-dryout Film Boiling Heat Transfer in Rectangular Channel

在流动传热基础试验平台上进行了矩形通道干涸后膜态沸腾的传热试验,研究了各种热工水力参数对膜态沸腾传热的影响特性.结果表明:干涸后膜态沸腾是一个相对稳定的传热过程,其壁面温度不会出现明显的脉动;随着进口含汽率的增加,膜态沸腾热流密度减小,壁面温度升高,传热系数减小;随着质量流速的增大或系统压力的升高,膜态沸腾热流密度增大,壁面温度降低,传热系数增大.

Heat transfer experiments of post-dryout film boiling in rectangular channel were carried out on the basic test rig of flow ＆ heat transfer. The effects of various thermodynamic and hydraulic parameters on film boiling heat transfer were studied. Results show that the post-dryout film boiling is a relatively stable heat transfer process, and the wall temperature doesn＇t fluctuate obviously. With the increase of inlet fraction dryness, the post-dryout film boiling heat flux density decreases, the wall temperature increases, the heat transfer coefficient decreases. And with the increase of mass flow velocity and system pressure, the film boiling heat flux density increases, the wall temperature decreases, the heat transfer coefficient increases.