内外螺旋三角翅片管管外冷凝传热建模与优化(Ⅰ)——物理数学模型及数学处理方法

THE MODELING AND OPTIMIZATION OF CONDENSATION HEAT TRANSFER ON THE OUTER SURFACE OF IOSF TUBE (Ⅰ) PHYSICO_MATHEMATICAL MODEL AND MATHEMATICAL SOLUTION METHOD

将内外螺旋三角翅片管（简称ＩＯＳＦ管）管外冷凝换热表面分成表面张力起主导作用的膜状流冷凝区和重力分量为主导的沟槽内的溪状流排液区，由此建立了这两个区域相应的数学方程，并进一步导出了联立求解两个区域流动与传热的耦合方程，实现了对ＩＯＳＦ管管外冷凝和流动过程的准三维数值模拟．其数值计算结果具有较高的工程计算精度，为ＩＯＳＦ管及纵槽管的冷凝换热器的工程设计及结构参数优化提供了设计计算条件．

The heat transfer surface of the outer side of the IOSF tube is divided into the film condensation zone where the surface tensile force is the main effect and the drainage zone where gravitation is the main effect. The equations describing these two zones are formulated respectively. Besides, equation based on the equilibrium between the amount of the condensate and the drainage is induced to solve these equations and to set up a three_dimension simulation model. The model has high accuracy, and can be widely used to design and optimize the condenser with IOSF tubes and vertical grooved tubes.