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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：气泡流状态下多分散气液系统的经验阻力闭合：气泡群和微尺度湍流

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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：考虑到气泡是多分散的，即以不同大小和速度为特征的大量气泡，可以成功地模拟气泡流动状态下的气液系统。通过考虑这种分布在空间和时间上的演变，可以适当地克服相位耦合问题，这由所谓的广义人口平衡方程（GPBE）决定。因此，开发可靠的中尺度模型对其解决方案至关重要。这项工作集中于动量耦合的中尺度模型，即阻力系数，特别关注湍流气泡流状态中存在的所谓的气泡群和微观尺度湍流效应。本文采用拟议的经验方法对非常不同的气液系统（例如矩形和圆形鼓泡塔以及充气搅拌釜反应器）进行仿真，最终将仿真结果与可用的实验数据进行比较，从而获得了非常好的结果协议。 （C）2016年化学工程师学会。由Elsevier B.V.发布。保留所有权利。

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