Measurement System of Bubbly Flow Using Ultrasonic Velocity Profile Monitor and Video Data Processing Unit, (II) Flow Characteristics of Bubbly Countercurrent Flow
Measurement System of Bubbly Flow Using Ultrasonic Velocity Profile Monitor and Video Data Processing Unit, (II) Flow Characteristics of Bubbly Countercurrent Flow
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采用超声波速度分布监测仪和视频数据处理单元的气泡流测量系统，（二）气泡逆流流动特性
DOI：
10.3327/jnst.34.783
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
M. Mori
中科院分区：
文献类型：
--
作者：
M. Aritomi;Shirong Zhou;M. Nakajima;Y. Takeda;M. Mori
作者开发了一种由超声波速度剖面监测仪和视频数据处理单元组成的测量系统，旨在阐明气泡流中的多维流动特性，并为验证多维两相流的数值代码提供数据库。本文将该测量系统应用于垂直矩形通道内的气泡逆流流动。首先，对通道中的气泡和水的速度分布以及空隙率分布进行了统计研究。接下来，将连续液相中的湍流强度定义为速度波动的标准偏差，并将通道中湍流强度的两相乘子曲线明确为气泡逆流中的流量波动的标准偏差与水单相流中的流量波动的标准偏差之比。最后，根据获得的两相速度分布和空隙率分布计算了气泡逆流漂移通量模型中使用的分布参数和漂移速度，并与针对气泡逆流流动提出的相关性进行了比较。
The authors have developed a measurement system which is composed of an ultrasonic velocity profile monitor and a video data processing unit in order to clarify its multi-dimensional flow characteristics in bubbly flows and to offer a data base to validate numerical codes for multi-dimensional two-phase flow. In this paper, the measurement system was applied for bubbly countercurrent flows in a vertical rectangular channel. At first, both bubble and water velocity profiles and void fraction profiles in the channel were investigated statistically. Next, turbulence intensity in a continuous liquid phase was defined as a standard deviation of velocity fluctuation, and the two-phase multiplier profile of turbulence intensity in the channel was clarified as a ratio of the standard deviation of flow fluctuation in a bubbly countercurrent flow to that in a water single phase flow. Finally, the distribution parameter and drift velocity used in the drift flux model for bubbly countercurrent flows were calculated from the obtained velocity profiles of both phases and void fraction profile, and were compared with the correlation proposed for bubbly countercurrent flows.