液氮过冷流动沸腾数值模拟中的双流体模型  

A TWO-FLUID MODEL FOR NUMERICAL SIMULATION OF SUBCOOLED BOILING FLOW OF LIQUID NITROGEN

作　　者：李祥东[1] 周丽敏[2] 汪荣顺[1] 杨燕华[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]江苏工业学院材料科学与工程系,常州213016

出　　处：《力学进展》2009年第2期203-216,共14页Advances in Mechanics

基　　金：中国博士后科学基金(20070410722);国家自然科学基金(50806042)资助项目~~

摘　　要：液氮过冷流动沸腾广泛见于各种低温换热设备中.采用双流体模型分析液氮过冷流动沸腾,需要为模型提供适当的封闭方程,用于描述汽液两相间质量、动量以及能量的传输过程,封闭方程的合理性直接决定了双流体模型的准确性.将液氮流动沸腾通道划分为近壁区和主流区,分别介绍液氮核态沸腾壁面上的传热传质机理模型,以及两相流程内汽液之间的相互作用的相间传输模型,建立液氮流动沸腾过程适用的双流体模型,并分析了对模型预测能力具有显著影响的因素,指出存在的问题和解决方案.Boiling flow of nitrogen is widely encountered in cryogenic heat exchanger systems. The key issue when formulating a two-fluid model is to complement suitable closure correlations, which are introduced to describe interactions between the liquid phase and the vapor phase and have a strong effect on the accuracy of the model. In the present paper, the boiling flow channel of liquid nitrogen is divided into two sub-regions： the near-wall region and the interior flow region, for which the mechanism model of heat and mass transfer on the nucleate boiling surface and the inter-phase interaction models are proposed, respectively. The key correlations and the problems to be resolved are also presented.

关 键 词：液氮 双流体模型 壁面传热传质模型 相间传榆模型 数值计算 

分 类 号：O359.1[理学—流体力学] TQ051.5[理学—力学]