A study of the bubble-to-slug transition in vertical gas-liquid flow in columns of different diameter
A study of the bubble-to-slug transition in vertical gas-liquid flow in columns of different diameter
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DOI：
10.1016/s0301-9322(97)00067-0
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发表时间：
1998-04-01
影响因子：
3.8
通讯作者：
Azzorpardi, BJ
中科院分区：
文献类型：
--
作者：
Cheng, H;Hills, JH;Azzorpardi, BJ
本研究的目的是调查的结构，向上的空气-水的流动和它的变化，接近气泡到段塞过渡，以期了解过渡的机制。气泡尺寸随柱高度的发展用双针电阻率探针测量，空隙率波用在150 mm直径柱中具有象限电极的阻抗空隙率计（IVFM）测量。结果进行了比较与一些实验数据收集在一个28.9 mm的列。在150 mm直径的塔中不存在传统的弹状流，而是逐渐过渡到搅动流。空泡率波的可能的不稳定性检测过程中从气泡到搅拌在恒定的液体流量，但不是在恒定的气体流量。在28.9 mm的柱中，在恒定的液体速率下，发生从气泡到段塞流的突然转变，强烈指示相关的空隙率波不稳定性。(C)1998爱思唯尔科技有限公司版权所有。
The aim of this study is to investigate the structure of upwards air-water flow and its variation as the bubble-to-slug transition is approached, with a view to understanding the mechanism of the transition. The development of bubble size with column height is measured with a double needle resistivity probe, and of void fraction waves with an Impedance Void Fraction Meter (IVFM) with quadrant electrodes in a 150 mm diameter column. The results are compared with some experimental data gathered in a 28.9 mm column. Traditional slug flow does not exist in the 150 mm diameter column; instead there is a gradual transition to churn flow. Possible instabilities of void fraction waves are detected during the transition from bubble to churn at constant liquid rate, but not at constant gas rate. In the 28.9 mm column at constant liquid rate, an abrupt transition from bubble-to-slug flow occurs, with strong indications of associated void fraction wave instabilities. (C) 1998 Elsevier Science Ltd. All rights reserved.