池式核沸腾中的“界面汽化热阱”效应

采用扩散极限电流技术 ( LDCT)与传热测定同时进行的实验方法分析了池核沸腾中的“界面汽化热阱”效应。传热实验所测定的是池核沸腾的总换热系数 ,由 LDCT测定并以类比原理可以获得对流传热系数 ,两者差值即为“界面汽化热阱”效应。实验结果表明 ,沸腾时 ,“界面汽化热阱”效应随热流率的提高而显著增大。对以 LDCT法测得的对流传热数据进行关联 ,获得了准数式。

The Effect of "Interfacial Vaporization Heat Sink" in Pool Nucleate Boiling Process

The method applying the Limiting Diffusion Current Technique (LDCT) and heat transfer measurement together is used to separate the “effect of interfacial vaporization heat sink” in pool nucleate boiling process.The total heat transfer coefficient is measured by the heat transfer measurement and the convective heat transfer coefficient is obtained by LDCT.The experimental results show that in the pool nucleate boiling process the “effect of interfacial vaporization heat sink” obviously increases with the heat transfer flux.A convective heat transfer correlative equation is obtained with the data measured by LDCT as follow:Nu=5478(P/P c ) 0.67 (Re b ) 0.56 (Pr l ) 0.33 