Modelling bubbly flow and its transitions in vertical annuli using population balance technique

A.K. Das; P.K. Das

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Modelling bubbly flow and its transitions in vertical annuli using population balance technique

机译：使用人口平衡技术模拟垂直环空中的气泡流动及其过渡

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Bubbly flow and its transitions in vertical annuli is studied using population balance technique. Bubble breakup and coalescence is accounted separately to track the evolution of the bubble size during the simultaneous flow of gas and liquid. The conventional two-fluid model is used to simulate the hydrodynamics. The model enables the prediction of voidage profile at any axial location. Presence of peak in the void distribution at the walls of the annulus, center of the annulus and both at walls and centers is observed depending on the phase superficial velocities. Further, transition from bubbly to slug and bubbly to dispersed bubbly is predicted based on the evolved bubble size. The model prediction gives a good match with the experimental data and existing theory. A shift in the transition boundary is noted due to the variation in inlet bubble size and the dimension of the annulus.

机译：利用人口平衡技术研究了气泡在垂直环空中的流动及其过渡过程。气泡破裂和聚结被分开考虑，以跟踪气体和液体同时流动期间气泡尺寸的变化。常规的双流体模型用于模拟流体动力学。该模型可以预测任何轴向位置的空隙轮廓。取决于相表面速度，在环的壁，环的中心以及在壁和中心的空隙分布中都存在峰值。此外，基于气泡尺寸的演变，预测从气泡到块状以及从气泡到分散气泡的过渡。该模型预测与实验数据和现有理论非常吻合。由于入口气泡尺寸和环面尺寸的变化，注意到过渡边界发生了变化。

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来源
《International Journal of Heat and Fluid Flow》 |2010年第1期|101-114|共14页
作者
A.K. Das; P.K. Das;
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作者单位

Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India;

Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
annuli; bubbly flow; slug flow; population balance; wall peaking; core peaking;

机译：环形气泡流团流人口平衡;壁峰;核心峰值;

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Modelling bubbly flow and its transitions in vertical annuli using population balance technique

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