Abstract

A mathematical model of film condensation is constructed which is obtained based on the equations for the conservation of mass, momentum, and energy for a heat-transfer fluid in the limited region of the condensate film and gas phase flowing down the surface of the wall of a heat exchanger in a two-dimensional setting. Equations for conserving the momentum of this model take into account the change in the physical properties of the heat-transfer fluid and condensate film depending on temperature. The boundary conditions of coupling are written for the regions on the inner wall of the flow range of the heat-transfer fluid and outer wall along which the condensate film flows, as well as at the film–gas interface. The boundary problem is solved by approximate and numerical methods, together with the condition for determining the unknown thickness of the film for different settings of the thermodynamic problem. Computational and physical experiments are conducted to study the main parameters and regularities of the process.

中文翻译：

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膜冷凝时传热和传质的耦合模型

摘要

构造膜冷凝的数学模型，该模型基于方程式获得，该方程用于在冷凝膜的有限区域内传热流体的质量，动量和能量守恒，并且气相向下流过壁表面。二维设置的热交换器。用于保持该模型的动量的方程式考虑了传热流体和冷凝膜的物理特性随温度的变化。耦合的边界条件写在传热流体的流量范围的内壁和冷凝膜流过的外壁以及膜-气界面的区域上。边界问题通过近似和数值方法解决，以及为热力学问题的不同设置确定薄膜未知厚度的条件。进行计算和物理实验以研究过程的主要参数和规律性。