池沸腾传热的数学分析

Mathematical analysis of pool boiling heat transfer

在统计方法的基础上,对于池沸腾换热的传热机理提出了一个数学模型.在没有增加新的经验常数的条件下,从该模型中可得到池沸腾热流密度是壁面过热度、活化穴最小与最大尺寸、流体的接触角与流体物理特性的函数.该模型可以较好地解释润湿性如何影响沸腾热流密度.对不同的接触角,模型预测的结果与实验相符合.

In this paper for the mechanisms of pool boiling heat transfer a mathematical model is derived based on statistical treatment.No additional new empirical constant is introduced.The proposed model for pool boiling heat flux is found to be a function of wall superheating,minimum and maximum active cavity sizes,the contact angle,and physical properties of fluid.It also turns out that the present model well explains the mechanism of how wettability affects the boiling heat flux.The model predictions are compared with the existing experimental data,and fair agreement is found for different contact angles.