A Review on the Some Issues of Multiphase Flow with Self-Driven Particles

Abstract

Multiphase flow with self-driven particles is ubiquitous and complex. Exploring the flow properties has both important academic meaning and engineering value. This review emphasizes some recent studies on multiphase flow with self-driven particles: the hydrodynamic interactions between self-propelled/self-rotary particles and passive particles; the aggregation, phase separation and sedimentation of squirmers; the influence of rheological properties on its motion; and the kinematic characteristics of axisymmetric squirmers. Finally, some open problems, challenges, and future directions are highlighted.

Special Issue on Multiphase Flows in Microfluidics: Fundamentals and Applications

“…Chen et al [15] numerically simulated the motion and distribution of bi-disperse particles in Poiseuille flow and showed that the particle spacing would increase and could not remain stable when the smaller particle was downstream; the particle spacing first increased and then decreased, and finally tended to be stable when the larger particle was downstream. Liu and Lin [16] reviewed multiphase flow with self-driven particles and focused on the interactions between selfpropelled/self-rotary particles and passive particles, the aggregation, phase separation, and sedimentation of squirmers, the effect of rheological properties on its motion, and the kinematic characteristics of axisymmetric squirmers. Yang et al [17] studied the trajectories and velocities of two side-by-side particles of different densities settling in a shear-thinning fluid with viscoelastic properties.…”

Hydrodynamics of an Elliptical Squirmer

“…They gather in a place full of nutrients, breed and build territory. On the other hand, synthesized self-driven particles (e.g., artificial cell, Janus, biomarkers, miniature swimming devices) are designed for targeted drug delivery, precise surgery and so on [1]. The swimming mode of the self-driven particles can mostly be described by the squirmer model which was initially proposed by Lighthill [2] based on the Opalina propulsion mode in the three-dimensional (3D) status.…”