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| 基于相场格子Boltzmann方法的相间传质模拟 |
| Simulation of interphase mass transfer based on the phase field lattice Boltzmann method |
| 投稿时间：2023-10-26 修订日期：2023-12-09 |
| DOI： |
| 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 |
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| 摘要点击次数: 74 |
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| 中文摘要: |
| 相间传质在科学、工程和技术领域广泛存在。为了研究静态和动态情况下不混溶两相之间的相间传质过程，本文将连续组分传输模型与相场格子玻尔兹曼方法结合，构建了一个适用于模拟具有大密度比两相流系统相间传质过程的格子Boltzmann多相模型。该模型通过在碰撞过程引入源项和相界面处引入传质通量，保证相界面上的通量连续性。随后通过模拟静止相界面传质问题和毛细管驱替与传质过程验证了传质模型的正确性。和现有模型相比，本文提出的模型在模拟相间传质过程时可以保证相界面传质通量方面具有较高的精度。在此基础上，本文模拟了多孔介质内的相间传质过程，并对多孔介质内两相传质通量的变化原因和影响因素进行深入研究。研究结果表明相界面传质通量的变化可以将多孔介质中相间传质过程划分为两个阶段，第一阶段相界面总传质通量伴随界面处浓度梯度迅速减小。第二阶段的总传质通量曲线与单位相界面速度曲线的变化趋势高度一致。 |
| 英文摘要: |
| 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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