Interfacial area concentration in annular two-phase flow
Interfacial area concentration in annular two-phase flow
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DOI：
10.1016/j.ijheatmasstransfer.2007.01.017
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发表时间：
2007-07-01
影响因子：
5.2
通讯作者：
Ishii, Mamoru
中科院分区：
文献类型：
--
作者：
Hazuku, Tatsuya;Takamasa, Tomoji;Ishii, Mamoru
准确预测界面面积浓度是成功开发的界面传递项在双流体模型是必不可少的。环状流和环状雾流的界面浓度与液膜干涸的过渡过程密切相关，这可能会对沸腾传热系统的安全和高效运行造成严重影响。然而，很少有实验和理论研究集中在环空流区的界面浓度。从这一点来看，环状流参数，如一维的液膜的界面面积浓度和局部界面面积浓度分布的测量进行了21个轴向位置的激光焦点位移计在垂直向上的环状两相流中，使用3米长，11毫米直径的管道。由管道直径（D）归一化的距入口的轴向距离（z）在z/D = 50-250范围内变化。收集了预设气体和液体流动条件下的数据，气相雷诺数范围为31，800至98，300，液相雷诺数范围为1050至9430。利用实验数据考察了液膜一维界面浓度的轴向发展和无量纲局部界面浓度分布。利用已有的漂移通量模型、雾沫夹带关联式和液滴粒径关联式，讨论了包括液膜和液滴在内的总界面浓度。(C)2007爱思唯尔有限公司保留所有权利。
Accurate prediction of the interfacial area concentration is essential to successful development of the interfacial transfer terms in the two-fluid model. The interfacial area concentration in annular flow and annular-mist flow is especially relevant to the transition process to the liquid film dryout, which might lead to fatal problem in the safety and efficient operation of boiling heat transfer system. However, very few experimental and theoretical studies focusing on the interfacial area concentration in annular flow region have been conducted. From this point of view, measurements of annular flow parameters such as one-dimensional interfacial area concentration of liquid film and local interfacial area concentration profile of liquid film were performed by a laser focus displacement meter at 21 axial locations in vertical upward annular two-phase flow using a 3-m-long and 11-mm-diameter pipe. The axial distances from the inlet (z) normalized by the pipe diameter (D) varied over z/D = 50-250. Data were collected for preset gas and liquid flow conditions and for Reynolds numbers ranging from 31,800 to 98,300 for the gas phase and 1050 to 9430 for the liquid phase. Axial development of the one-dimensional interfacial area concentration and the non-dimensional local interfacial area concentration profile of liquid film were examined with the data obtained in the experiment. Total interfacial area concentration including liquid film and droplets was also discussed with help of the existing drift-flux model, entrainment correlation, and droplet size correlation. (C) 2007 Elsevier Ltd. All rights reserved.