Simulating Gas鈥揕iquid Flows by Means of a Pseudopotential Lattice Boltzmann Method

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• 作者：M. R. Kamali ; H. E. A. Van den Akker
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：August 21, 2013
• 年：2013
• 卷：52
• 期：33
• 页码：11365-11377
• 全文大小：625K
• 年卷期：v.52,no.33(August 21, 2013)
• ISSN：1520-5045

文摘

Dispersed gas (vapor)鈥搇iquid flow through an inclined microchannel with bends has successfully been simulated, that is, without numerical difficulties, by means of a two-phase Lattice Boltzmann method. Combining in this method the Shan-Chen1 pseudopotential interaction model with the Yuan and Schaefer2 proposal for dealing with nonideal equations of state makes high density ratios achievable. This approach also allows simulation of gas鈥搇iquid flows without explicitly having to track the phase interfaces. Rather, a potential function related to the equation of state for vapor鈥搇iquid equilibrium, a coupling strength representing attraction or repulsion between species, and a relaxation time scale take care of microscale and mesoscale phenomena such as phase separation and interfacial tension as well as interphase transport and multiphase flow. In addition, fluid鈥搘all interaction (contact angle) is taken into account by selecting proper potential functions and coupling strengths. As far as the phase behavior is concerned, we assessed our method by studying the phase separation process and by validating against Maxwell鈥檚 equilibrium rule. Qualitative validation of our approach of gas鈥搇iquid flow has been done with a comparison against experimental data on a single bubble rise. Detailed simulations were carried out for an individual Taylor bubble in a channel, the results of which compared favorably to literature data.