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

TL;DR

This paper introduces a linearised model to efficiently predict inertial forces on particles in porous channels with permeate flow, validated through experiments, simplifying complex flow interactions for practical applications.

Contribution

The paper presents a novel linearised model that accurately captures the interplay of inertial and permeate forces on particles, reducing computational complexity.

Findings

Linearised model accurately predicts lateral forces across flow conditions

Model validated experimentally for various flow rates and particle sizes

Simplifies prediction of particle migration in permeate channels

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 focussing positions of finite sized particles (Garcia & Pennathur 2017) . 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 (Re). Interestingly, we show that the lateral forces on the particle is well represented using a linearised model across a range of permeate-to-axial flow rate ratios, $\gamma$. 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.