基于VOF模型的膜状冷凝传热分析  

Numerical study on filmwise condensation heat transfer based on VOF model

作　　者：刘振宇[1] 吴慧英[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《热科学与技术》2014年第2期126-130,共5页Journal of Thermal Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(2012CB720404);国家自然科学基金资助项目(51306119;51376130);上海科委基础研究重点资助项目(12JC1405100)

摘　　要：基于流体体积函数法(volume of fluid,VOF)建立垂直平行平板通道内膜状冷凝传热预测数值模型,膜状冷凝传热传质过程模拟通过在VOF模型守恒方程中施加基于界面能量平衡方法的源项实现。通过数值分析研究发现,在壁面的顶部,冷凝液膜最薄,存在层流区域;冷凝液向下流动,一系列不规则的波纹随之出现;影响冷凝传热的主要因素是蒸汽的流速、液膜厚度及流动状态等。The numerical method was adopted to study the filmwise condensation heat transfer. A computational model was developed to predict condensation heat transfer between vertical parallel plates using a VOF model. The interface energy balance theory was specifically adopted to calculate the source terms associated with phase change. It is found that a laminar regime exists at the top of the wall, where the film is the thinnest. A wavy regime appears as a series of regular ripples/waves of condensate moving downwards under the action of both gravity and shear stress in the interface area. The predictions indicate that the condensation heat transfer is influenced by vapor velocity, film thickness and its flow status.

关 键 词：CFD 膜状冷凝 VOF模型 传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]