Electro-elastic instability in electroosmotic flows of viscoelastic fluids through a model porous system

Khan, Mohd Bilal; Sasmal, C.

doi:10.1016/j.euromechflu.2022.10.004

Cited by 8 publications

(7 citation statements)

References 57 publications

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“…According to them, it was attributed to the absence of shear-driven or any other deformations in this particular geometry wherein mostly extensional-dominated elastic instabilities were present. However, a very recent numerical study by Khan and Sasmal 84 found an increase in the mixing efficiency in the same kind of geometry as that used by Bryce and Freeman 83 . They used the Oldroyd-B viscoelastic constitutive equation to mimic the rheological behaviour of a Boger fluid and the Poisson-Boltzmann (PB) equation to calculate the ion distribution in the system for a wide range of electric field strength and viscosity ratio.…”

Section: Applications In Microfluidic Mixingmentioning

confidence: 81%

“…A microchannel with either step expansion and contraction or micro constrictions could also be investigated to see its potential in enhancing the rate of transport processes. This particular geometry has also shown the potential to create elastic instability and turbulence 36,49,53,141 . Moreover, the fabrication of this latter geometry would be relatively easier than that of the curvilinear or serpentine microchannel.…”

Section: Discussionmentioning

confidence: 99%

“…• Most studies related to either the generation of EI and ET phenomena or to demonstrate their potential in heat transfer rate or mixing enhancement applications have been conducted in pressure-driven flows. In comparison, very few studies were conducted for electrokinetically-driven generation and applications of the EI and ET phenomena [83][84][85]176,177 . However, it can be readily acknowledged that electrokinetic-driven flows are often used to transport fluids in micro-scale geometries for the following reasons i) the EK-based microdevices do not have any moving mechanical parts as they rely on the application of an electric field, and hence, they are easy to handle ii) the electrokinetic flows offer less resistance to the flow than pressuredriven flows due to almost plug-like velocity profile in the former flows 178 .…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Applications of elastic instability and elastic turbulence: Review, limitations, and future directions

Sasmal¹

2023

Preprint

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Section: Applications In Microfluidic Mixingmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Applications of elastic instability and elastic turbulence: Review, limitations, and future directions

Sasmal¹

2023

Preprint

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“…Xuan et al 1 have presented a basic model of electroosmotic flow where they have discussed the joule heating effects. Recently, Khan and Sasmal 2 investigated the electroosmotic flow phenomenon for both Newtonian and viscoelastic fluids through a porous environment containing long micropores. An investigation on the coupled impact of pressure-driven flow and electrokinetics is carried out by Yuan et al 3 where they did not ignore the adverse pressure impact on electroosmotic flow.…”

Section: Introductionmentioning

confidence: 99%

Electroosmotically actuated peristaltic-ciliary flow of propylene glycol + water conveying titania nanoparticles

Akram

Akbar

2023

Sci Rep

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The main focus of this article is to mathematically formulate the microfluidics-based mechanical system for nanofluids. A 50:50 mixture of propylene glycol (PG) and water is used as a heat transfer fluid because of its tremendous anti-freezing properties, and nontoxicity and it is safe to be utilized at the domestic level. Titanium dioxide (titania) nanoparticles are suspended in the working fluid to enhance its heat transfer ability. The fluid flow is induced by electroosmosis in a microtube, which is further assisted by cilia beating. The impacts of Joule heating and non-linear thermal radiation are also considered. The simplification of the dimensionless system is done under lubrication theory and the Debye-Hückel linearization principle. The nonlinear system of equations is executed for a numerical solution by adopting the symbolic mathematical software Maple 17 using the command “dsolve” along with the additional command “numeric” to get the numerical solution. This command utilizes a low-ordered method along with accuracy-enhancing schemes such as the deferred correction technique and Richardson extrapolation to get a numerical answer of desired accuracy, where we can choose the accuracy level and mesh points according to our requirements. The detailed analysis of results obtained from the numerical treatment of the considered problem indicates that the efficiency of the PG + water enhances due to the suspension of the nanoparticles and heat is rapidly removed from the system. Further, the velocity of the fluid is augmented by decreasing the thickness of the electric double layer and raising the strength of the electric field in the forwarding direction.

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“…Strong chaotic and unstable flow is made possible by the interaction of elastic stress and streamline curvature. This phenomenon promotes the potentiality of species to mix together. − Additionally, having different electrical conductivities of candidate liquids intended to be mixed leads to electrokinetic instability beyond the critical electric field strength. As witnessed in the referred literature, , this flow feature facilitates to achieving the felicitated mixing quality of the constituent components.…”

Section: Introductionmentioning

confidence: 99%

AC Electrothermal Effect Promotes Enhanced Solute Mixing in a Wavy Microchannel

Mehta,

Mondal

2023

Langmuir

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For liquids used in biological applications, a smaller diffusion coefficient results in a longer mixing time. We discuss, in this endeavor, the promising potential of the AC electrothermal (ACET) effect toward modulating enhanced mixing of electrolytic liquids with higher convective strength in a novel wavy micromixer. To this end, we develop a modeling framework and numerically solve the pertinent transport equations in a three-dimensional (3D) configuration numerically. By benchmarking the developed modeling framework with the experimental results available in this paradigm, we aptly demonstrate the maximum temperature rise, flow topology, species concentration field, and mixing efficiency in the proposed configuration for a set of parameters pertinent to this analysis. We find that the maximum temperature increase in the wavy micromixer, owing to the electrothermal effect, is less than 10 K even for the higher strength of the applied voltage, implying nondegradation of biological substances within the liquid sample. We report that the formation of significant lateral flow closer to the electrodes leads to a highly three-dimensional ACET flow field, which has a significant impact on the mixing efficiency for the range of diffusive Peclet numbers considered. We also report that the wave amplitude of the mixer, when intervening with the diffusive Peclet number, strongly impacts the mixing efficiency. As witnessed in this endeavor, for the smaller diffusive Peclet number, the mixing efficiency increases with amplitude, while the effect becomes the opposite for the higher Peclet number. The results of this study seem to provide an adequate basis for the design of a novel micromixer intended for enhanced solute mixing in realistic microfluidic applications.

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Electro-elastic instability in electroosmotic flows of viscoelastic fluids through a model porous system

Cited by 8 publications

References 57 publications

Applications of elastic instability and elastic turbulence: Review, limitations, and future directions

Applications of elastic instability and elastic turbulence: Review, limitations, and future directions

Electroosmotically actuated peristaltic-ciliary flow of propylene glycol + water conveying titania nanoparticles

AC Electrothermal Effect Promotes Enhanced Solute Mixing in a Wavy Microchannel

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