|Simulation of interphase mass transfer based on the phase field lattice Boltzmann method
|中文关键词: 相间传质 两相流 格子玻尔兹曼方法 相场模型 多孔介质
|英文关键词:Interphase Mass Transfer Two-phase Flow Lattice Boltzmann Method Phase Field Model Porous Media
| Interphase mass transfer is widely prevalent in the fields of science, engineering, and technology. To investigate the interphase mass transfer processes between immiscible phases under both static and dynamic conditions, a lattice Boltzmann multiphase model is constructed in this study by integrating a continuous component transport model with the phase-field lattice Boltzmann method. Specifically designed for simulating interphase mass transfer processes in two-phase flow systems characterized by a large density ratio, the model ensures the continuity of mass transfer flux on the phase interface by introducing source terms in the collision process and incorporating mass transfer flux at the phase interface. The validity of the proposed mass transfer model is subsequently verified through simulations of stationary interphase mass transfer problems and capillary displacement with mass transfer processes. In comparison with existing models, higher accuracy in simulating interphase mass transfer processes, particularly regarding the precision of mass transfer flux on the phase interface, is achieved by the model presented in this paper. Built upon this foundation, the study delves into simulations of interphase mass transfer processes within porous media. A thorough investigation is conducted into the reasons and influencing factors behind the variations in mass transfer flux between the two phases within porous media. The research findings reveal that the variation in mass transfer flux on the phase interface allows for the categorization of the interphase mass transfer process in porous media into two stages. In the first stage, the total mass transfer flux on the phase interface experiences a rapid decrease alongside the concentration gradient near the interface. The trends in the total mass transfer flux curve in the second stage exhibit a high degree of consistency with the curve representing the velocity of the unit phase interface.
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