An active particle in a complex fluid

Abstract

In this work, we study active particles with prescribed surface velocities in non-Newtonian fluids. We employ the reciprocal theorem to obtain the velocity of an active spherical particle with an arbitrary axisymmetric slip-velocity in an otherwise quiescent second-order fluid. We then determine how the motion of a diffusiophoretic Janus particle is affected by complex fluid rheology, namely viscoelasticity and shear-thinning viscosity, compared to a Newtonian fluid, assuming a fixed slip-velocity. We find that a Janus particle may go faster or slower in a viscoelastic fluid, but is always slower in a shear-thinning fluid as compared to a Newtonian fluid.

9 pages, 3 figures

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• Memory-based mediated interactions between rigid particulate inclusions in viscoelastic environments
• Non-Newtonian effects on the slip and mobility of a self-propelling active particle
• Squirmer locomotion in a yield stress fluid
• Self-diffusiophoretic propulsion of a spheroidal particle in a shear-thinning fluid
• Diffusiophoretic propulsion of an isotropic active colloidal particle near a finite-sized disk embedded in a planar fluid-fluid interface
• Comment on "Migration of an electrophoretic particle in a weakly inertial or viscoelastic shear flow"
• Micro-swimmer collective dynamics in Brinkman flows
• Micro-swimmer locomotion and hydrodynamics in Brinkman Flows
• Microswimming in viscoelastic fluids