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A linearised model for calculating inertial forces on a particle in the presence of a permeate flow

Published online by Cambridge University Press:  20 December 2018

Mike Garcia ,
B. Ganapathysubramanian  and
S. Pennathur Open the ORCID record for S. Pennathur [Opens in a new window]
Mike Garcia
Affiliation:
Department of Mechanical Engineering, University of California Santa Barbara, Engineering II, Room 2355 University of California, Santa Barbara, CA 93106, USA
B. Ganapathysubramanian
Affiliation:
Department of Mechanical Engineering, Iowa State University, 306 Lab of Mechanics, Ames, IA 50011, USA
S. Pennathur*
Affiliation:
Department of Mechanical Engineering, University of California Santa Barbara, Engineering II, Room 2355 University of California, Santa Barbara, CA 93106, USA
*
†Email address for correspondence: sumita@ucsb.edu
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Abstract

Understanding particle transport and localisation in porous channels, especially at moderate Reynolds numbers, is relevant for many applications ranging from water reclamation to biological studies. Recently, researchers experimentally demonstrated that the interplay between axial and permeate flow in a porous microchannel results in a wide range of focusing positions of finite-sized particles (Garcia & Pennathur, Phys. Rev. Fluids, vol. 2 (4), 2017, 042201). We numerically explore this interplay by computing the lateral forces on a neutrally buoyant spherical particle that is subject to both inertial and permeate forces over a range of experimentally relevant particle sizes and channel Reynolds numbers. Interestingly, we show that the lateral forces on the particle are well represented using a linearised model across a range of permeate-to-axial flow rate ratios. Specifically, our model linearises the effects of the permeate flow, which suggests that the interplay between axial and permeate flow on the lateral force on a particle can be represented as a superposition between the lateral (inertial) forces in pure axial flow and the viscous forces in pure permeate flow. We experimentally validate this observation for a range of flow conditions. The linearised behaviour observed significantly reduces the complexity and time required to predict the migration of inertial particles in permeate channels.

JFM classification

Micro-/Nano-fluid dynamics: Microfluidics Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Multiphase and Particle-laden Flows: Particle/fluid flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 861 , 25 February 2019 , pp. 253 - 274
Copyright
© 2018 Cambridge University Press 

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