水平管内汽液两相流流型及换热特性数值模拟

Numerical simulation on flow pattern and heat transfer of vapor-liquid two-phase flow in horizontal pipe

为研究水平管内相变汽液两相流动流型变化,使用VOF模型和RSM湍流模型对其进行了数值模拟,分析了水平管内对流换热、压降及流型的变化.模拟结果表明:VOF模型和RSM湍流模型可用于模拟两相流流型中的泡状流、分层流、波状流、弹状流以及环状流;模拟结果与Mandhane流型图基本吻合;对流换热系数及压降与已有关联式吻合较好.

In order to study the evolution of the flow pattern in a phase-transition vapor-liquid two-phase flow in a horizontal pipe,numerical simulation based on volume-of-fluid（ VOF） model and the Reynolds stress turbulence model（ RSM） was performed. The characteristics of convective heat transfer,pressure drop and evolution of flow patterns in the simulated horizontally pipe-flow were analyzed. It was obtained that the VOF model and RSM model can be used to simulate bubble flow,stratified flow,wavy flow,slug flow and annular flow. The simulated two-phase flow patterns are in agreement with the Mandhane flow pattern map. Furthermore,the simulated heat transfer coefficient and pressure drop are also in good agreements with the existing correlations.