复合粒子的动力学和稳定性--理论研究
Dynamics and stability of a compound particle -- a theoretical study
摘要：
被限制在液滴中的粒子称为复合粒子。它们存在于各种生物和软物质系统中。流体动力学可以在确定这些多相结构的构造和稳定性方面发挥决定性作用。因此，我们研究了同心复合颗粒在外力和外加流作用下的动力学和稳定性。控制方程解析求解的惯性限制使用的标准技术叠加的矢量谐波和获得的解决方案的稳定状态的流场，粘性阻力的颗粒和时间演化的限制液滴形状的报告。分析了每种情况下复合颗粒作为薄膜包覆刚性颗粒的极限形式。我们发现，同心配置的旋转复合粒子是一个稳定的状态下的解决方案，我们计算所需的额外的力，以稳定同心配置的平移复合粒子。还提供了各种线性环境流中的液滴变形的全面比较。基于这些发现，我们提出脉动流作为一种可靠的方法来输送化合物颗粒，而不会使限制液滴破裂。因此，我们的分析提供了有用的指导方针，在有核细胞，气溶胶，液滴为基础的封装运动生物体和聚合物微胶囊的背景下，稳定的化合物颗粒的制备和运输。
英文摘要：
Particles confined in droplets are called compound particles. They are encountered in various biological and soft matter systems. Hydrodynamics can play a decisive role in determining the configuration and stability of these multiphase structures during their preparation and use. Therefore, we investigate the dynamics and stability of a concentric compound particle under external forces and imposed flows. Governing equations are solved analytically in the inertia-less limit using the standard technique of superposition of vector harmonics and the solutions obtained are reported in terms of steady state flow fields, viscous drag on the particle and the time evolution of the confining drop shape. The limiting form of compound particle as a thin film coated rigid particle is analyzed in each case. We find that concentric configuration of a rotating compound particle is a steady state solution, and we calculate the extra force required to stabilize the concentric configuration of a translating compound particle. A comprehensive comparison of drop deformations in various linear ambient flows is also provided. Based on the findings, we propose pulsatile flow as a reliable method to transport compound particles without breakup of the confining drop. Thus, our analysis provides useful guidelines in preparation and transportation of stable compound particles in the context of nucleated cells, aerosols, droplet-based encapsulation of motile organisms and polymer microcapsules.
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