Electroosmotic flow of viscoelastic fluids in deformable microchannels

TL;DR

This paper presents a theoretical analysis of electroosmotic flow of viscoelastic fluids in deformable microchannels, revealing how parameter optimization can enhance load capacity for bio-mimetic microfluidic device design.

Contribution

It introduces a coupled theoretical framework for electrokinetics, fluid rheology, and substrate deformability, highlighting new ways to improve microchannel performance.

Findings

Enhanced load capacity with polymer concentration and molecular weight adjustments

Significant flow modifications due to substrate compliance and fluid rheology

Potential for improved bio-mimetic microfluidic device performance

Abstract

The electroosmotic flow of non-Newtonian fluids in deformable microchannels is fundamentally important in the understanding of the hydrodynamics in physiological flows. The performance of these microchannels is governed by the load bearing capacity indicating the maximum amount of load that the device can withstand. While significant research efforts are aimed towards the coupling of electrokinetics with substrate deformability, the corresponding enhancement in the performances still remains elusive. Towards this, employing an intricate coupling between substrate compliance, hydrodynamic, and electrokinetic modulations, we have analyzed the possible sources of alterations in the flow physics in a deformable microchannel under the rheological premises of viscoelastic fluids which have a close resemblance with biological fluids typically used in several bio and micro-fluidic applications. The present study reveals that by operating under favorable regimes of parameters like the concentration and molecular weight of the polymer, the quality of the Newtonian solvent, and the concentration of electrolyte, one can achieve substantial augmentation in the load carrying capacity of a deformable microchannel for viscoelastic fluids as compared to its Newtonian counterpart. We believe that the present theoretical framework can be extremely important in the designing of electro-kinetically modulated bio-mimetic microfluidic devices.