竖直环形通道内液氮自然循环沸腾可视化实验研究  

Visual experimental investigation of natural circulation boiling of nitrogen in a vertical annular

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：《低温与超导》2007年第4期286-289,354,共5页Cryogenics and Superconductivity

摘　　要：采用基于高速摄像手段的可视化方法研究了竖直环形通道内的液氮自然循环沸腾过程,建立了汽泡脱离直径及汽泡脱离频率的实验关联式,以新建方程结合双流体模型进行了数值计算。与实验数据的对比表明,建立的实验关联式对于液氮自然循环沸腾过程中的汽泡脱离直径及汽泡脱离频率具有很好的预测精度。Natural circulation boiling of nitrogen in a vertical annular is visually investigated using a high - speed CCD camera. Correlations of the bubble detachment diameter and the bubble detachment frequency are proposed and numerical simulations are conducted using the two - fluid model with the newly proposed correlations as the closure correlations. The predicted bubble detachment diameter and the bubble detachment frequency are in good agreement with experimental data.

关 键 词：液氮 自然循环 可视化 汽泡脱离直径 汽泡脱离频率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]