流体惯性对弹性界面液滴吸附行为的影响

Effects of Fluid Inertia on Adhesion Behaviors of Elastic Capsules

弹性膜包裹黏性流体组成的液滴(弹性界面液滴)可与功能性壁面形成化学吸附键,产生吸附力,与黏性力和惯性力共同控制流场中液滴的吸附动力学行为。本文基于前期发展的界面追踪(Front tracking method)-界面有限元方法,结合吸附反应动力学模型,发展了可同时考虑流体惯性、界面弹性和流体黏性的弹性界面液滴吸附动力学三维模拟方法。重点分析了流体惯性对弹性界面液滴吸附行为的影响规律。结果表明:雷诺数增大导致流场作用于弹性界面液滴的阻力和升力都增大,因此流体惯性作用导致弹性界面液滴更容易从壁面脱附。

Elastic capsules（consisting of viscous fluid enclosed by elastic membranes） can form specific adhesion bonds with functionalized surface.Adhesion force in these bonds and viscous and inertial force in fluids determine adhesive dynamics of capsules under flow.In this paper,based on the front-tracking finite-element method we developed previously,we further combine the kinetic adhesion dynamics model and develop a three-dimensional model for adhesive dynamics of capsules,in which membrane elasticity,fluid inertia and viscosity can be considered simultaneously.The effects of fluid inertia on adhesive characteristics of capsules are investigated systematically.Results show that fluid inertia induces the increase of both drag and lift forces from the surrounding fluid.As a consequent,the detachment of the elastic capsule is promoted by fluid inertia.