竖壁膜状凝结扩展方程理论研究

Theory Research in Film Condensation on Vertical Plate

在用边界层理论研究竖壁膜状凝结理论时 ,发现中小雷诺数下以及凝结前沿区误差较大 .为了解决这个问题 ,提出了扩展方程理论 ,并用于求解竖壁上的膜状凝结问题 ,得到了相应的控制方程组和换热准则 ,再与实验值和经验公式相比较 ,可见本方程得到的曲线与实验曲线非常吻合 .通过对扩展方程和热边界层方程无因次形式的分析比较 。

When the boundary layer theory is used to study the film condensation on the vertical plate, the error was found much bigger in the case of middle or small figures of Re or on the front of the condensation field.To solve the problem, the theory of expanded equation was put forward to solve the problem of the film condensation on the vertical plate,with the corresponding control equation and heat transfer standard obtained. The comparison between the experimental value and the practical equation was made. By comparison and analysis, the relationship between the expanded equation and the heat boundary equation has been determined.