Baseline closure model for dispersed bubbly flow: Bubble coalescence and breakup
Baseline closure model for dispersed bubbly flow: Bubble coalescence and breakup
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DOI：
10.1016/j.ces.2014.09.042
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发表时间：
2015-01
影响因子：
4.7
通讯作者：
Y. Liao;R. Rzehak;D. Lucas;E. Krepper
中科院分区：
文献类型：
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作者：
Y. Liao;R. Rzehak;D. Lucas;E. Krepper
定义了一套绝热泡状流的双流体模拟封闭模型作为基线模型，为进一步改进和发展提供了共同的基础。它包括气泡力的闭合、气泡引起的湍流以及气泡的合并和破裂。在本工作中，基线模型在商业程序AnsysCFX14.5中实现，并应用于绝热上升垂直管流的情况。特别注意了新提出的合并和分解模型的性能。与实测值的比较表明，基线模型能够在较大范围的流动条件下捕捉气泡尺寸分布、气体体积分数和速度分布沿管道的演变。
A set of closures for two-fluid modelling of adiabatic bubbly flows has been defined as baseline model, which provides a common basis for further improvement and development. It includes closures for bubble forces, bubble-induced turbulence as well as bubble coalescence and breakup. In this work, the baseline model is implemented in the commercial code ANSYS CFX 14.5 and applied to the case of adiabatic upward vertical pipe flows. Special attention is paid to the performance of the newly proposed coalescence and breakup model. The comparison with measurements shows that the baseline model is able to capture the evolution of bubble size distribution, gas volume fraction and velocity profiles along the pipe over a wide range of flow conditions.