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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Empirical drag closure for polydisperse gas-liquid systems in bubbly flow regime: Bubble swarm and micro-scale turbulence
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Empirical drag closure for polydisperse gas-liquid systems in bubbly flow regime: Bubble swarm and micro-scale turbulence

机译：经验拖动关闭多分散的气液系统的流态:泡沫群,微尺度湍流

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摘要

Gas-liquid systems in the bubbly flow regime can be successfully simulated by considering that gas bubbles are polydisperse, namely a population of bubbles characterized by different sizes and velocities. Phase coupling issues can be properly overcome by considering the evolution in space and time of such distribution, which is dictated by the so-called Generalized Population Balance Equation (GPBE). Therefore, the development of reliable meso-scale models is crucial for its solution. This work focuses on meso-scale models for momentum coupling, namely the drag force coefficient, with particular attention to the so-called bubble swarm and micro-scale turbulence effects present in the turbulent bubbly flow regime. The proposed empirical methodology is here adopted for the simulation of very different gas-liquid systems, such as rectangular and circular bubble columns, as well as aerated stirred tank reactors, and simulation results are eventually compared with the available experimental data, resulting in very good agreement. (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：气液系统泡沫流态被考虑到成功地模拟了气体泡沫是多分散的,即人口由不同的大小和泡沫特征速度。克服通过考虑空间的进化和时间的分布,这是规定所谓广义人口平衡方程(GPBE)。可靠的数值模型是至关重要的解决方案。动力耦合,即阻力系数,特别注意所谓的泡沫群和微尺度湍流在动荡的泡沫流的影响政权。这里采用不同的模拟气液系统,如矩形和圆水准器列,以及加气搅拌釜反应器和仿真结果最终与可用的实验数据,结果很好协议。工程师。保留。

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