Numerical simulation of single bubble motion in ionic liquids

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• 作者：Xiaoling Wang ; Haifeng Dong ; Xiangping Zhang ; Liang Yu ; Suojiang Zhang ; Yan Xu
• 关键词：Multiphase flow ; Bubble ; Ionic liquids ; Volume-of-fluid ; Computational fluid dynamic ; Bubble column
• 刊名：Chemical Engineering Science
• 出版年：2010
• 出版时间：15 November 2010
• 年：2010
• 卷：65
• 期：22
• 页码：6036-6047
• 全文大小：1576 K

文摘

In this work a numerical simulation is studied to investigate the motion of single bubble in ionic liquids using an improved volume-of-fluid (VOF) method. In the improved method, besides the gravity and surface tension, a new drag force is added to the momentum equation in order to describe the gas–liquid interaction in the ionic liquids, which possess some special properties compared with the traditional solvents. The deformation, velocity and equivalent diameter of single bubble rising in three ionic liquids, i.e., bmimBF₄, bmimPF₆ and omimBF₄, are simulated and the calculation results agree well with the experimental data. Furthermore, the detailed velocity fields and pressure fields around the bubbles are predicted with the proposed numerical simulation model. This work is important for understanding the fluid dynamic performance of bubbles in ionic liquids, and could provide a useful tool for designing a bubble column with ionic liquids as its solvents.