Pulsatile electroosmotic flow in a microchannel with asymmetric wall zeta potentials and its effect on mass transport enhancement and mixing

Medina, I.; Toledo-Velázquez, Miguel; Méndez, F.; Bautista, O.

doi:10.1016/j.ces.2018.03.051

Cited by 32 publications

(24 citation statements)

References 25 publications

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“…The density and dynamic viscosity of liquid 2 are 997 kg/m 3 and 900 μPa s , respectively. If the (19) […”

Section: Resultsmentioning

confidence: 99%

“…They also studied the effect of combined pressure gradient (PG) and AC electroosmosis on the flow field of a non-Newtonian fluid [17]. Pulsatile EOF of Newtonian and non-Newtonian fluids in microchannels with various conditions such as slip boundary condition as well as asymmetric wall zeta potentials was conducted [18][19][20] to examine the hydrodynamic characteristics of the flow field under the influence of key parameters such as angular Reynolds number. Electric double layers cannot be formed in nonpolar fluids (with very low electric conductivity) where they are in contact with surfaces; hence, such fluids may not be directly pumped using electroosmosis.…”

Section: Introductionmentioning

confidence: 99%

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AC two-immiscible-fluid EOF in a microcapillary

Akbarzadeh

2019

J Braz. Soc. Mech. Sci. Eng.

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Time-periodic aspects of two-liquid flow in a circular microchannel are numerically studied in which electroosmosis and pressure gradient are directly utilized to drive conducting and non-conducting liquids, respectively. The results reveal that hydrodynamic parameters of the two fluids together with the coupling effects between them affect the flow characteristics. Frequency, electrokinetic radius, surface charges at the interface between the two immiscible fluids, viscosity ratio and body force ratio (or equivalently, the ratio of the reference velocities in the pure pressure-and electroosmosis-driven flows) are key parameters which determine primarily important features of the flow. High-frequency flow leads to comparatively small magnitudes of velocity and Poiseuille number; in fact in this case, a finite time is required for momentum to diffuse far into the bulk fluid depending on the angular frequency. In case of higher dynamic viscosity ratio, the flow resistance of the nonconducting fluid is higher, resulting in a steeper velocity gradient at the interface of the conducting liquid. The existence of the interface zeta potential may result in a broader flow field (i.e., higher extrema values). For nonzero body force ratio, a pressure gradient obviously exists in one direction and the periodic flow field is not completely symmetric; hence, a net flow rate in one direction is preferably attained.

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“…The density and dynamic viscosity of liquid 2 are 997 kg/m 3 and 900 μPa s , respectively. If the (19) […”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

AC two-immiscible-fluid EOF in a microcapillary

Akbarzadeh

2019

J Braz. Soc. Mech. Sci. Eng.

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“…However, its sensitivity to electrochemical properties and Joule heating can limit its applicability to a variety of samples . Oscillatory EOF is still in early development, with numerous theoretical studies emerging . Bengtsson et al recently developed a clip‐on electroosmotic pump with standardized Luer connectors for microfluidic cell culture devices, shown in Figure .…”

Section: Pulsatile Flows In Microfluidic Processesmentioning

confidence: 99%

Pulsatile Flow in Microfluidic Systems

Dincau

Dressaire

Sauret

2019

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This review describes the current knowledge and applications of pulsatile flow in microfluidic systems. Elements of fluid dynamics at low Reynolds number are first described in the context of pulsatile flow. Then the practical applications in microfluidic processes are presented: the methods to generate a pulsatile flow, the generation of emulsion droplets through harmonic flow rate perturbation, the applications in mixing and particle separation, and the benefits of pulsatile flow for clog mitigation. The second part of the review is devoted to pulsatile flow in biological applications. Pulsatile flows can be used for mimicking physiological systems, to alter or enhance cell cultures, and for bioassay automation. Pulsatile flows offer unique advantages over a steady flow, especially in microfluidic systems, but also require some new physical insights and more rigorous investigation to fully benefit future applications.

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“…They established that both heat transfer characteristics and flow formation are significantly affected by the asymmetries in wall boundary conditions for both purely electroosmotic and combined pressure-driven and electroosmotic flows. Peralta et al [28], Medina et al [29], Soong and Wang [23] and Jha and Oni [30] gave a theoretical analysis on the effects of asymmetries in wall conditions and zeta-potential on electrokinetic flows in a microchannel and concluded that the asymmetric conditions have significant effect on flow formation, temperature distribution and heat transfer. Other related reviewed references can be found in [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of transient natural convection flow in a vertical microchannel with electrokinetic effect

Oni

Jha

2019

Journal of Taibah University for Science

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In this article, a theoretical analysis is carried out to understand the role of electrokinetic effect on transient natural convection flow in a vertical microchannel. By incorporating the electrokinetic body force and the natural convection term in the classical Navier-Stokes equations, the governing momentum equation for the current investigation is developed and solved analytically using the classical Laplace transform technique. Due to the complexity of solutions obtained in Laplace domain, the Riemann-sum approximation (RSA) technique is used to transform the solutions from Laplace domain to time domain. For accuracy check, the steady-state solution is also computed and compared with the implicit finite difference method and RSA at large time. Results show that skin-friction at the walls as well as the mass-flux can be optimized by careful selection of flow controlling parameters. In addition, it is found that the time required to attain steadystate skin-friction and mass-flux is weakly dependent on EDL size while strongly dependent on Knudsen number.

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Pulsatile electroosmotic flow in a microchannel with asymmetric wall zeta potentials and its effect on mass transport enhancement and mixing

Cited by 32 publications

References 25 publications

AC two-immiscible-fluid EOF in a microcapillary

AC two-immiscible-fluid EOF in a microcapillary

Pulsatile Flow in Microfluidic Systems

Theoretical analysis of transient natural convection flow in a vertical microchannel with electrokinetic effect

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