Rotating electroosmotic flow of power-law fluid through polyelectrolyte grafted microchannel

Patel, Maneesh; Kruthiventi, S S Harish; Kaushik, P.

doi:10.1016/j.colsurfb.2020.111058

Cited by 19 publications

(4 citation statements)

References 30 publications

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“…The effect of fluid rheology on rotating electroosmotic flow was discussed for Jeffrey fluid by Liu and Jian [401]. The power-law fluid was studied by Patel et al [405] in soft (Polyelectrolyte grafted) microchannels. Li et al [406] analyzed Jeffrey fluid's transient AC electroosmotic flow in a soft nanochannel.…”

Section: Effects Of Both Electric and Magnetic Fieldsmentioning

confidence: 99%

Review and Analysis of Electro-Magnetohydrodynamic Flow and Heat Transport in Microchannels

Kundu

Saha

2022

Energies

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This paper aims to develop a review of the electrokinetic flow in microchannels. Thermal characteristics of electrokinetic phenomena in microchannels based on the Poisson–Boltzmann equation are presented rigorously by considering the Debye–Hückel approximation at a low zeta potential. Several researchers developed new mathematical models for high electrical potential with the electrical double layer (EDL). A literature survey was conducted to determine the velocity, temperature, Nusselt number, and volumetric flow rate by several analytical, numerical, and combinations along with different parameters. The momentum and energy equations govern these parameters with the influences of electric, magnetic, or both fields at various preconditions. The primary focus of this study is to summarize the literature rigorously on outcomes of electrokinetically driven flow in microchannels from the beginning to the present. The possible future scope of work highlights developing new mathematical analyses. This study also discusses the heat transport behavior of the electroosmotically driven flow in microchannels in view of no-slip, first-order slip, and second-order slip at the boundaries for the velocity distribution and no-jump, first-order thermal-slip, and second-order thermal-slip for the thermal response under maintaining a uniform wall-heat flux. Appropriate conditions are conferred elaborately to determine the velocity, temperature, and heat transport in the microchannel flow with the imposition of the pressure, electric, and magnetic forces. The effects of heat transfer on viscous dissipation, Joule heating, and thermal radiation envisage an advanced study for the fluid flow in microchannels. Finally, analytical steps highlighting different design aspects would help better understand the microchannel flow’s essential fundamentals in a single document. They enhance the knowledge of forthcoming developmental issues to promote the needed study area.

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Section: Effects Of Both Electric and Magnetic Fieldsmentioning

confidence: 99%

Review and Analysis of Electro-Magnetohydrodynamic Flow and Heat Transport in Microchannels

Kundu

Saha

2022

Energies

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“…Their study revealed that electrokinetic parameters are influenced by the fluid rheology and nanochannel properties, which impact the energy conversion efficiency. Another theoretical study by Patel et al 52 analyzed the impact of Coriolis force on the EOF in a rotating soft nanochannel considering the background electrolyte as a power-law fluid. They observed that the presence of polymer brushes imparts a motion-deterring drag force on the fluid, which, in turn, leads to significantly lower flow rates, especially for shear-thickening fluids compared to shearthinning fluids.…”

Section: ■ Introductionmentioning

confidence: 99%

Electroosmotic Flow Modulation and Enhanced Mixing through a Soft Nanochannel with Patterned Wall Charge and Hydrodynamic Slippage

Pal,

Mahapatra,

Ohshima

et al. 2024

Ind. Eng. Chem. Res.

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The present study deals with the modulation of electroosmotic flow (EOF) through a soft nanochannel filled with a non-Newtonian fluid. The supporting charged hydrophobic walls of the channel are physicochemically patterned, which in turn leads to possibilities of modulated interfacial slip and surface ζ-potential. In addition, the supporting walls are grafted with an ion-and fluid-penetrable polyelectrolyte layer (PEL), which further entraps ionizable functional groups that give rise to immobile volumetric charges across the PEL. The fluid flow across such engineered devices under an applied electric field gives rise to an intricate electrohydrodynamic coupling over small scales. The mathematical model that describes the modulation of EOF across such a soft nanochannel comprises the Poisson equation for electrostatic potential and Nernst−Planck equations for conservation of the mass of mobile electrolyte ions, the flow field within the PEL is governed by a modified Darcy−Brinkman equation, and the Cauchy momentum equation governs the fluid flow outside the PEL. We adopt a radial basis function (RBF)based meshless computation scheme to simulate the set of governing equations. We further deduced analytical expressions for the electrostatic potential and velocity field for a Newtonian electrolyte through a bare channel with patterned surface potential, valid for a low charge limit. The numerical results are, however, obtained for a wide range of pertinent parameters and are further validated with the deduced theoretical results and available mathematical and experimental results from the literature. We observe an array of counter-rotating vortices that form in the flow field of the background non-Newtonian power-law fluid. Such vortices originate due to spatially periodic variations of hydrodynamic slippage as well as surface ζ-potential. The strength of vortices further intensifies due to the presence of the PEL grafted along the supporting rigid walls. The flow modulation across such a channel is illustrated by considering all of the possible sets of pertinent parameters. We further studied the impact of the rotational flow profile on the mixing of injected uncharged solutes. We observed that the formation of vortices in the flow field across the engineered soft nanochannel significantly affects the mixing efficiency, which can further be enhanced by suitably regulating the physicochemical and hydrodynamic parameters that control the flow modulation across the channel.

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“…Because of this, many investigations have been done by many researchers [45][46][47]. Patel et al [48] scrutinized the EO behavior of power-law fluid flow in a rotating microchannel. This research is important in the design of a CD system with delicate channels for handling bio-liquids such as blood, spit/mucus, and so on.…”

Section: Introductionmentioning

confidence: 99%

Electro-Osmotic Flow of MHD Jeffrey Fluid in a Rotating Microchannel by Peristalsis: Thermal Analysis

Venkateswarlu

et al. 2023

Sci. Eng. Technol.

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In this study, we examine the rotating and heat transfer on the peristaltic and electro-osmatic flow of a Jeffery fluid in an asymmetric microchannel with slip impact. A pressure gradient and anal axially imposed electric field work together to impact the electro-osmotic flow (EOF). Mathematical modeling is imported by employing the low Reynolds number and long wavelength approximation. The exact solution has been simplified for the stream function, temperature, and velocity distributions. The effects of diverse egress quantities on the gush virtue are exhibited and discussed with the help of graphs. The shear stress and trapping phenomena have been investigated. The characterization of results has been resolved for the flow governing ingrained appropriate parameters by employing the table. Our findings can be summarized as follows: (i) Debye length has a strong influence on the conducting viscous fluid of EOF in non-uniform micro-channel. (ii) The temperature field is enhanced through the elevated values of the rotation parameter and EOF. (iii) The shear stress has oscillatory behavior and the heat transmission rate increases with the magnitude of larger values of EOF. Finally, there is good agreement between the current results and those that have already been published. This model applies to the study of chemical fraternization/separation procedures and bio-microfluidic devices for the resolution of diagnosis.

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Rotating electroosmotic flow of power-law fluid through polyelectrolyte grafted microchannel

Cited by 19 publications

References 30 publications

Review and Analysis of Electro-Magnetohydrodynamic Flow and Heat Transport in Microchannels

Review and Analysis of Electro-Magnetohydrodynamic Flow and Heat Transport in Microchannels

Electroosmotic Flow Modulation and Enhanced Mixing through a Soft Nanochannel with Patterned Wall Charge and Hydrodynamic Slippage

Electro-Osmotic Flow of MHD Jeffrey Fluid in a Rotating Microchannel by Peristalsis: Thermal Analysis

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