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An active particle in a complex fluid

Published online by Cambridge University Press:  23 June 2017

Charu Datt Open the ORCID record for Charu Datt [Opens in a new window] ,
Giovanniantonio Natale ,
Savvas G. Hatzikiriakos  and
Gwynn J. Elfring
Charu Datt
Affiliation:
Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
Giovanniantonio Natale
Affiliation:
Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, V6T 1Z3, Canada
Savvas G. Hatzikiriakos
Affiliation:
Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, V6T 1Z3, Canada
Gwynn J. Elfring*
Affiliation:
Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
*
†Email address for correspondence: gelfring@mech.ubc.ca
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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.

JFM classification

Complex Fluids: Complex Fluids Low-Reynolds-number flows: Low-Reynolds-number flows Biological Fluid Dynamics: Micro-organism dynamics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 823 , 25 July 2017 , pp. 675 - 688
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Copyright
© 2017 Cambridge University Press 

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