固体溶质溶解过程自然对流非稳态数值模拟

利用多物理场耦合分析软件Comsol Multiphysic 3.5及其动网格技术,结合传质学相关理论对固体溶质溶解过程进行了直接数值模拟.考虑了溶解过程中液相部分的自然对流,溶解引起的其表面形态的变化由溶解质量与相界面处的浓度梯度的关系建立的方程描述.研究结果表明:文中方法可以很好地捕捉由于溶解引起的界面运动和变形的...

Numerical simulation of natural convection in transient solid-liquid unsteady dissolution process

Based on multi-physics software Comsol Multiphysic 3.5,dynamic mesh technique and mass transfer theory,the dissolution process of solid solute was directly numerical simulated.Considering the natural convection in the liquid phase during dissolution process,a solid morphology develops due to the different mass flux around the solid-liquid interface,and the concentration gradient determines the dissolution rate.The results show that the method can well capture the interface motion and position due to dissolution,and obtain the propagations of flow and concentration field.The natural convection can facilitate the renewal of the interface and the mass transfer process.So the influence of natural convection on dissolution should be fully considered in the investigation of solid dissolution.