低压下水欠热流动沸腾的两相CFD数值模拟研究

采用两流体(汽相和液相)基本数学模型，结合汽相和液相之间的界面传热、传质和动量交换封闭模型、汽泡平均直径模型、汽泡脱离直径模型、汽泡成核模型、汽泡脱离频率模型、欠热沸腾起始点模型和壁面热流密度分配模型，在CFD软件CFX4.4中采用用户自定义函数将相变引起的传热、传质和动量交换作为源项分别添加到汽相和液相的能量、质量和动量守恒方程中，对低压下内管加热外管绝热的环形通道内的欠热沸腾进行了数值研究，得到了欠热流动沸腾下汽相体积份额、液相速度、汽相速度分布等。采用Lee等的环形通道内低压下欠热沸腾体积份额实验数据对计算结果进行了验证，吻合良好。

CFD Investigation of Subcooled Flow Boiling Model Under Low Pressure

Two fluid model integrating a set of closure relationships(such as inter-phase heat transfer model,inter-phase mass transfer model,inter-phase momentum transfer model,mean bubble diameter model,bubble departure diameter model,bubble departure frequency model,onset of nucleate boiling model,wall heat flux partition model) was applied to solve the local flow and heat transfer of subcooled flow boiling under low pressure.The inter-phase mass and momentum energy transfer due to the phase change were added to th...