Rotating electroosmotic flow of two-layer fluids through a microparallel channel

Zheng, Jiaxuan; Jian, Yongjun

doi:10.1016/j.ijmecsci.2017.12.039

Cited by 28 publications

(10 citation statements)

References 45 publications

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“…Two-layer EOF assisted by peristalsis force was proposed by Ranjit et al, who analyzed entropy generation and heat transfer in such cases [ 57 ]. External factors such as a rotating environment [ 58 ] or varying wall shapes together with zeta potential [ 59 ] have been considered in two-layer electroosmotic systems, and the resulting influence on hydrodynamic behavior has been discussed. Furthermore, because of its desirable thermal conductivity properties, nanofluids can be applied in two-layer mixed convection flows, which are characterized by the power-law nanofluid model; the outcomes can help with the promotion of heat transfer performance [ 60 ].…”

Section: Introductionmentioning

confidence: 99%

Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel

Deng

Tan

2022

Micromachines

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To achieve the optimum use and efficient thermal management of two-layer electroosmosis pumping systems in microdevices, this paper studies the transient hydrodynamical features in two-layer electroosmotic flow of power-law nanofluids in a slit microchannel and the corresponding heat transfer characteristics in the presence of viscous dissipation. The governing equations are established based on the Cauchy momentum equation, continuity equation, energy equation, and power-law nanofluid model, which are analytically solved in the limiting case of two-layer Newtonian fluid flow by means of Laplace transform and numerically solved for two-layer power-law nanofluid fluid flow. The transient mechanism of adopting conducting power-law nanofluid as a pumping force and that of pumping nonconducting power-law nanofluid are both discussed by presenting the two-layer velocity, flow rates, temperature, and Nusselt number at different power-law rheology, nanoparticle volume fraction, electrokinetic width and Brinkman number. The results demonstrate that shear thinning conducting nanofluid represents a promising tool to drive nonconducting samples, especially samples with shear thickening features. The increase in nanoparticle volume fraction promotes heat transfer performance, and the shear thickening feature of conducting nanofluid tends to suppress the effects of viscous dissipation and electrokinetic width on heat transfer.

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Section: Introductionmentioning

confidence: 99%

Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel

Deng

Tan

2022

Micromachines

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“…The study [34] focused on the combined pressure driven and electroosmotic flow of two layer power-law fluids by evaluating velocity and flow rate at different electroosmotic characters where the coupling effect of electroosmotic characters and fluid permittivity on EOF has not been covered. In addition, according to the electrostatic theory, as two fluids interact with each other, an electric double layer and zeta potential difference occur near the two-fluid interface, which play important role on the two-fluid velocity due to the existence of both shear stress and the Maxwell stress at the two-fluid interface based on the studies [24] [35]. Therefore, in this context, the present paper aims to develop a model for two-fluid EOF of power-law fluids through a microtube in the presence of excess ions and zeta potential difference near the two-liquid interface.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study of the Electroosmotic Flow of Two Immiscible Power-Law Fluids in a Microchannel

Deng¹

2022

OJFD

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The multilayer microchannel flow is a promising tool in microchannel-based systems such as hybrid microfluidics. To assist in the efficient design of twoliquid pumping system, a two-fluid electroosmotic flow of immiscible powerlaw fluids through a microtube is studied with consideration of zeta potential difference near the two-liquid interface. The modified Cauchy momentum equation in cylindrical coordinate governing the two-liquid velocity distributions is solved where both peripheral and inner liquids are represented by power-law model. The two-fluid velocity distribution under the combined interaction of power-law rheological effect and circular wall effect is evaluated at different viscosities and different electroosmotic characters of inner and peripheral power-law fluids. The velocity of inner flow is a function of the viscosities, electric properties and electroosmotic characters of two power-law fluids, while the peripheral flow is majorly influenced by the viscosity, electric property and electroosmotic characters of peripheral fluid. Irrespective of the configuration manner of power-law fluids, the shear thinning fluid is more sensitive to the change of other parameters.

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“…In recent years, microfluidics systems have begun to receive more attention from scholars due to the lab-on-a-chip concept [1][2][3][4][5]. This is a new research direction that involves biomedicine, chemistry and fluid physics [6][7][8][9]. The driving forms of this new type of technology include the pressure gradient, electric field, magnetic field and surface tension.…”

Section: Introductionmentioning

confidence: 99%

The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces

Bian

Jian

2021

Micromachines

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In this paper, the effects of asymmetrically modulated charged surfaces on streaming potential, velocity field and flow rate are investigated under the axial pressure gradient and vertical magnetic field. In a parallel-plate microchannel, modulated charged potentials on the walls are depicted by the cosine function. The flow of incompressible Newtonian fluid is two-dimensional due to the modulated charged surfaces. Considering the Debye–Hückel approximation, the Poisson–Boltzmann (PB) equation and the modified Navier–Stokes (N-S) equation are established. The analytical solutions of the potential and velocities (u and v) are obtained by means of the superposition principle and stream function. The unknown streaming potential is determined by the condition that the net ionic current is zero. Finally, the influences of pertinent dimensionless parameters (modulated potential parameters, Hartmann number and slip length) on the flow field, streaming potential, velocity field and flow rate are discussed graphically. During the flow process and under the impact of the charge-modulated potentials, the velocity profiles present an oscillating characteristic, and vortexes are generated. The results show that the charge-modulated potentials are beneficial for the enhancement of the streaming potential, velocity and flow rate, which also facilitate the mixing of fluids. Meanwhile, the flow rate can be controlled through the use of a low-amplitude magnetic field.

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Rotating electroosmotic flow of two-layer fluids through a microparallel channel

Cited by 28 publications

References 45 publications

Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel

Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel

Analytical Study of the Electroosmotic Flow of Two Immiscible Power-Law Fluids in a Microchannel

The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces

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