Electrothermally Modulated Dispersion in Viscoelastic Fluids on Patterned Surfaces

Abstract

Augmenting the dispersion of a solute species remains a challenging topic in electroosmotically-actuated flows due to the inherent plug-like feature of its velocity profile. In this study, we improvise on electrothermal flow of viscoelastic fluids through a parallel-plate microchannel with patterned surface charge to depict augmented dispersion coefficient of a solute. Here we consider the physical properties of the fluid to be temperature-dependent, thus, bringing out the combinatorial effect of both the thermal perturbation as well as the surface modulation on the resulting dynamics. This analysis unveils that by making a judicious choice of pertinent parameters one can control the flow rate with the desired account of dispersion. We envisage that the intricate coupling between the electrothermal perturbation and surface charge modulation combined with the fluid rheology may have tremendous implications towards the efficient designing of microfluidic devices.

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• Diffuse-Charge Dynamics in Electrochemical Systems
• Induced-Charge Electro-Osmosis
• Rheology of human blood plasma: Viscoelastic versus Newtonian behavior
• Electrohydrodynamics within electrical double layer in a pressure-driven flow in presence of finite temperature gradients
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Cited by in corpus (3)

• Temperature-gradient induced massive augmentation of solute dispersion in viscoelastic micro-flows
• An electrokinetic route to giant augmentation in load bearing capacity of compliant microfluidic channels
• Electroosmotic flow of viscoelastic fluids in deformable microchannels