基于格子Boltzmann大密度比模型的多孔介质内气泡动力学行为数值模拟

基于格子Boltzmann两相流大密度模型,研究气泡穿过多孔介质的动力学行为.研究发现:当孔隙率较大时,气泡只变形不破裂,能完整地通过多孔介质;而孔隙率较小时,气泡变形更加剧烈且发生破裂,穿过多孔介质所需的时间更长.另外,当障碍物表面接触角(θ)较小时,气泡均能完整地通过多孔介质,随着接触角的增大,气泡开始发生破裂,且...

Numerical Simulation of Bubble Dynamics in Porous Media with a Lattice Boltzmann Large Density Ratio Model

With a lattice Boltzmann two-phase flow model with large density ratio, we study dynamic behavior of a bubble as it passes through a porous media. It was found that as the porosity is large, the bubble deforms without breaking, and it passes completely through the porous medium; As the porosity is small, the bubble deforms violently and ruptures, and it takes more time to pass through the porous medium. In addition, as the contact angle of the porous medium is small, the bubble passes completely through the porous medium; As the contact angle increases, the bubble begins to rupture; The larger the contact angle is, the more seriously the bubble ruptures. The residual mass of the bubble decreases with the increasing of the contact angle. Moreover, it shows that as Eotvos number (Eo) increases, the proportion of surface tension decreases; The bubble ruptures more seriously; And the residual mass of the bubble passing through the porous media is smaller. It is found that the influence of wettability on residual mass of the bubble is the most obvious, and the influence of Eo is the minimum.