Modelling and Simulation of Gas–Liquid Hydrodynamics in Mechanically Stirred Tanks
Modelling and Simulation of Gas–Liquid Hydrodynamics in Mechanically Stirred Tanks
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DOI：
10.1205/cherd06243
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发表时间：
2007
影响因子：
3.9
通讯作者：
F. Scargiali;A. D'Orazio;F. Grisafi;A. Brucato
中科院分区：
文献类型：
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作者：
F. Scargiali;A. D'Orazio;F. Grisafi;A. Brucato
计算流体动力学（CFD）是实现过程设备仿真的重要工具。在多相系统的情况下，CFD模型的发展不如单相系统先进。本文报道了气液搅拌槽的CFD模拟。欧拉-欧拉多流体方法与k-s湍流模型最简单的两相扩展相结合使用。假设所有气泡的大小相同。另外考虑了相间力对模拟结果的影响。至于阻力，研究表明，表征分散相行为所需的唯一参数是气泡终端速度，这一考虑可以简化动量方程中相关项的估计，并有助于理解系统物理。尽管采用了许多简化方法，但结果与实验结果一致。
Computational fuid dynamics (CFD) is an increasingly important tool for carrying out realistic simulations of process equipment. In the case of multiphase systems the development of CFD models is less advanced than for single-phase systems. In the present work CFD simulations of gas-liquid stirred tanks are reported. An Eulerian-Eulerian multi-fluid approach is used in conjunction with the simplest two-phase extension of the k-s turbulence model. All bubbles are assumed to share the same size. The effect of inter-phase forces on simulation results is separately considered. As concerns drag, it is shown that the sole parameter needed to characterize the dispersed phase behaviour is bubble terminal velocity, a consideration that eases the estimation of the relevant term in the momentum equations and helps understanding the system physics. Despite the many simplifications adopted, results are found to be in satisfactory agreement with experiment.