复合液滴通过多孔介质的耦合运动和动力学过程研究

The phenomenon of compound droplet motion through porous media exists widely in nature, chemical industry, petroleum and environment. This phenomenon is very complex because of the multiple surface, moving contact line and complex geometry boundary included, and need to be studied urgently. The researchers have done many works about the processes of the single-phase droplet through porous media, but for the compound droplet, people still do not figure out the phenomenon and mechanism in it. About the compound droplet motion through porous media, this project will carry out the following researches: Firstly, we will establish the moving contact line model in three phase fluid flow on substrates with complex geometry, and develop the related direct numerical method and codes; Secondly, the simulations of the compound droplet motion through porous media will be performed, and the phenomena of droplet trapped, squeezing and breakup are studied quantitatively by considering the effects of the factors such as droplet size, moving contact line behavior, shape of porous media and wettability of the substrates. Finally, we will reveal the fluid mechanism and sum up the scaling law in the process. The researches are expected not only to understand this dynamic process deeply, but also to provide theoretical and technical support for relevant engineering application.

复合液滴通过多孔介质的现象广泛存在于自然、化工、医药和环境等领域，其流动机理由于多重界面、移动接触线及复杂壁面等因素变得十分复杂，需要深入研究。学者们对于单相液滴通过多孔介质的流动研究已开展了大量工作，然而对于复合液滴通过多孔介质的现象与机理尚不清楚。针对复合液滴通过多孔介质的耦合运动和动力学过程，本项目将开展以下研究内容：首先，建立三相流体在复杂壁面上的移动接触线模型，发展相应的数值计算方法及程序；其次，开展直接数值模拟，定量考察液滴特性、移动接触线、多孔介质特性和多重界面等因素对于液滴堵塞、挤压通过及剪切破碎等过程的影响；最后，揭示其中的流动机理并建立有效的尺度律关系，使得本项目的研究不仅能够深入理解其中的蕴含的科学问题，也能为工程应用的合理分析和优化调控提供指导。

复合液滴与固体壁面的相互作用广泛存在于自然、化工、医药和环境等领域，其流动机理由于多重界面、移动接触线及复杂壁面等因素变得十分复杂，需要深入研究。学者们对于单相液滴与固体壁面相互作用下的流动研究已开展了大量工作，然而对于复合液滴与固体壁面相互作用的现象与机理尚不清楚。针对复合液滴与固体壁面的相互作用下的耦合运动和动力学过程，本项目开展了以下研究内容：首先，发展涉及三相流体、复杂壁面上、移动接触线的流动数值计算方法及程序；其次，开展了复合液滴撞击平板固体壁面后铺展行为的研究，重点关注内相液滴的存在对最大铺展比的影响，并提出了统一的理论预测公式，可以同时考虑不同的雷诺数、韦伯数、内相液滴体积比、表面张力比、壁面浸润性等因素；最后，开展了气泡通过圆弧形收缩孔隙的研究，展示了堵塞与通过两种模态，并对其临界条件进行了理论分析，得到了简洁有效对尺度率关系。本项目的研究不仅能够深入理解复合液滴与固体壁面相互作用中蕴含的科学问题，也能为相关工程应用的合理分析和优化调控提供指导。