Eulerian–Lagrangian simulations of unsteady gas–liquid flows in bubble columns

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• 作者：Vivek V. Buwa ; Dhanannjay S. Deo and Vivek V. Ranade
• 关键词：Bubble column ; Gas– ; liquid flow ; Dynamics ; Eulerian– ; Lagrangian simulations ; Eulerian– ; Eulerian simulations ; CFD
• 刊名：International Journal of Multiphase Flow
• 出版年：2006
• 出版时间：July 2006
• 年：2006
• 卷：32
• 期：7
• 页码：864-885
• 全文大小：1123 K

文摘

We studied the dynamics of gas–liquid flows in a rectangular bubble column using Eulerian–Lagrangian simulations. Three-dimensional, unsteady simulations were performed to simulate the dynamic characteristics of the oscillating bubble plume. The effect of superficial gas velocity and aerated liquid height-to-column width (H/W) ratio on the dynamic and time-averaged flow properties was studied and the simulated results were validated using wall pressure and voidage fluctuation measurements. The effect of lift force and numerical diffusion on the dynamic and time-averaged properties is discussed in detail. Further, the results obtained using the Eulerian–Lagrangian simulations were compared with the Eulerian–Eulerian simulations. The bubble scale information, which is otherwise lost in the Eulerian–Eulerian simulations, was validated using the voidage fluctuation measurements. Such experimentally validated Eulerian–Lagrangian models will be useful for the simulation of mass transfer and reactions in bubble columns.