非挥发性溶质溶液两相问题的格子Boltzmann方法

Lattice Boltzmann method for a two-phase nonvolatile solution system

溶液的气液两相体系广泛存在于工程问题中。由于其多组分和多相态以及组分之间相互作用的复杂性,用传统数值方法进行研究较为困难。该文提出了一种适用于非挥发性物质稀溶液的气液两相问题的格子Boltzmann方法。在Shan-Chen多组分格子Boltzmann模型的基础上,引入溶质与溶剂粒子间的作用力,建立了合理的作用力模型,完成了对溶液气液两相体系的数值模拟。模拟出了溶质的非挥发性以及表面非活性物质溶液的表面性质。表面吸附及表面张力的计算结果与相应理论公式符合很好。

Two-phase solution systems occur in many engineering problems but they are difficult to simulate with conventional numerical methods because of the complexity caused by multiple components and phases. A lattice Boltzmann method was developed for two-phase dilute solutions based on the Shan-Chen multi-component model with an interparticle force between the solvent and the solute. Simulations show that the method is effective for two-phase nonvolatile solutions. The method can also simulate the surface tension and the surface adsorption of non-surface-active solutions. The numerical results agree well with the corresponding relevant theories.