Electroviscous effects in charge-dependent slip flow of liquid electrolytes through a charged microfluidic device

Jitendra, Dhakar,; Bharti, Ram P.

doi:10.1016/j.cep.2022.109041

Cited by 9 publications

(22 citation statements)

References 49 publications

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“…Most recently, Banerjee et al [38] analyzed the influence of surface charge-dependent slip and electroviscous effect on pressure-driven flow and heat transfer of non-Newtonian fluids in microchannels. Dhakar and Bharti [39] investigated the pressure-driven flow through a charged microfluidic device with charge-dependent slip.…”

Section: Introductionmentioning

confidence: 99%

Combined electromagnetohydrodynamic flow in microchannels with consideration of the surface charge-dependent slip

Xing¹,

Liu²

2023

Phys. Scr.

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In microscale systems, hydrodynamic slip is considered to significantly influence the fluid flow field. Existing theories of electromagnetohydrodynamic flow in hydrophobic microchannels have postulated a constant slip length and ignored the effect of the surface charge on slip. In this study, we extended prior models by considering a combined pressure-driven and electromagnetohydrodynamic flow in microchannels with consideration of surface charge-dependent slip. An analytical solution for this simple model was derived. After a detailed discussion of the obtained results, we demonstrate that the more realistic surface-charge-dependent case has smaller velocities and flow rates than the surface-charge-independent slip case. Considering the effect of the surface charge on slip, the flow rate can be reduced by up to 7% in the currently selected parameter range. Our results are useful for optimizing electromagnetohydrodynamic flow models in microchannels.

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Section: Introductionmentioning

confidence: 99%

Combined electromagnetohydrodynamic flow in microchannels with consideration of the surface charge-dependent slip

Xing¹,

Liu²

2023

Phys. Scr.

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“…Charged surfaces of device attract counter-ions, thus, rearrangement of the ions close to the solid-liquid interface forms an 'electrical double layer' (EDL) which consists of Stern and diffuse layers (refer Fig. 1) [8][9][10][11]. The flow of mobile ions in diffuse layer due to imposed PDF on the liquid, generates a convection current which is known as 'streaming current' (I s ) (refer Fig.…”

Section: Introductionmentioning

confidence: 99%

“…It drives liquid with them in the opposite direction of the primary flow and reduces the net flow of electrolyte liquid. This phenomena is commonly known as the 'electroviscous effect' [7,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Over the years, electroviscous effects have studied broadly in the microfluidic devices and detailed literature is summarized by Dhakar and Bharti [10,11]. Experimental and numerical investigations are carried out to explore the electroviscous effects in pressure-driven liquid flow through symmetrically charged (S r = 1) microfluidic devices with uniform cross-sections such as cylinder [13][14][15][16][17][18], slit , rectangular [8,41,42], and elliptical [43] as well as non-uniform cross-sections such as contraction-expansion cylinder [44,45], slit [9,46], and rectangular [47].…”

Section: Introductionmentioning

confidence: 99%

“…The influence of contraction ratio and electroviscous effects on the electrolyte 2 liquid flow through symmetrically charged microchannel are analyzed recently [48]. However, Dhakar and Bharti [11] have analyzed electroviscous flow in the asymmetrically charged (S r ̸ = 1) contraction-expansion microfluidic device. These studies [9-11, 17, 44, 45, 47-49] concluded that the dimensionless parameters such as surface charge density (4 ≤ S ≤ 16), inverse Debye length (2 ≤ K ≤ 20), surface charge ratio (0 ≤ S r ≤ 2), contraction ratio (0.25 ≤ d c ≤ 1) and slip length (0 ≤ B 0 ≤ 0.20) strongly influence the flow characteristics, i.e., total potential (U ), induced electric field strength (E x ), excess charge (n * ), and pressure (P ) fields in the microfluidic devices.…”

Section: Introductionmentioning

confidence: 99%

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Electroviscous effects in pressure-driven flow of electrolyte liquid through an asymmetrically charged non-uniform microfluidic device

Dhakar,

Bharti

2023

Journal of the Taiwan Institute of Chemical Engineers

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Electromagnetohydrodynamic (EMHD) flow of Jeffrey fluid through a rough circular microchannel with surface charge–dependent slip

Li,

Dong,

2024

Electrophoresis

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This research examines the electromagnetohydrodynamic (EMHD) flow of Jeffrey fluid in a rough circular microchannel while considering the effect of surface charge on slip. The channel wall corrugations are described as periodic sinusoidal waves with small amplitudes. The perturbation method is employed to derive solutions for velocity and volumetric flow rate, and a combination of three‐dimensional (3D) and two‐dimensional (2D) graphical representations is utilized to effectively illustrate the impacts of relevant parameters on them. The significance of the Reynolds number in investigations of EMHD flow is particularly emphasized. Furthermore, the effect of wall roughness and wave number on velocity and the influence of wall roughness and surface charge density on volumetric flow rate are primarily focused on, respectively, at various Reynolds numbers. The results suggest that increasing the wall roughness leads to a reduction in velocity at low Reynolds numbers () and an increment at high Reynolds numbers (). For any Reynolds number, a roughness with an odd multiple of wave number () will result in a more stable velocity profile compared to one with an even multiple of wave number (). Decreasing the relaxation time while increasing the retardation time and Hartmann number can diminish the impact of wall roughness and surface charge density on volumetric flow rate, independent of the Reynolds number. Interestingly, in the existence of wall roughness, further consideration of the effect of surface charge on slip leads to a 15% drop in volumetric flow rate at and a 32% slippage at . However, in the condition where the effect of surface charge on slip is considered, further examination of the presence of wall roughness only results in a 1.4% decline in volumetric flow rate at and a 1.6% rise at . These findings are crucial for optimizing the EMHD flow models in microchannels.

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Electroviscous effects in charge-dependent slip flow of liquid electrolytes through a charged microfluidic device

Cited by 9 publications

References 49 publications

Combined electromagnetohydrodynamic flow in microchannels with consideration of the surface charge-dependent slip

Combined electromagnetohydrodynamic flow in microchannels with consideration of the surface charge-dependent slip

Electroviscous effects in pressure-driven flow of electrolyte liquid through an asymmetrically charged non-uniform microfluidic device

Electromagnetohydrodynamic (EMHD) flow of Jeffrey fluid through a rough circular microchannel with surface charge–dependent slip

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