Microfluidic rotational flow generated by redox-magnetohydrodynamics (MHD) under laminar conditions using concentric disk and ring microelectrodes

Sahore, Vishal; Fritsch, Ingrid

doi:10.1007/s10404-014-1427-6

Cited by 13 publications

(13 citation statements)

References 27 publications

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“…Similar to the process of solving Eq. (17), based on the boundary conditions (23)- (26) and solutions (27) and (29), the solution to the second-order problem (18) can be assumed to take the form of (see Supporting Information)…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Compared to other types of nonmechanical micropumps, the EMHD micropumps have several advantages, namely simple fabrication process, continuous flow force, and bidirectional pumping capability [4]. Recently, analytical [5][6][7][8][9][10][11][12][13], numerical [14][15][16][17], and experimental [4,[18][19][20][21][22][23][24][25][26] studies on EMHD flow in microchannels were widely investigated. EMHD can be used not only for the purpose of propelling fluids but also for generating secondary complex flow that may be beneficial for mixing and stirring [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetohydrodynamic (EMHD) flow between two transversely wavy microparallel plates

Buren

Jian

2015

Electrophoresis

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In this paper, 2D electromagnetohydrodynamic (EMHD) flow in a microparallel channel with slightly transverse corrugated walls is investigated using perturbation method. The corrugations of the two walls are presented by periodic sinusoidal waves with small amplitudes. The perturbation solutions of the stream function and a relation between flow rate and roughness are obtained. It is shown that the flow rate always decreases due to the wall corrugations irrespective of the phase difference. For prescribed Hartmann number and wave number of the wavy walls, the flow resistance increases as the phase difference between the wall corrugations increases. The effect of corrugation on the flow rate decreases with Hartmann number. With the increase of wave number, the effects of corrugations on the flow rate increase. The phase difference of wall corrugations becomes unimportant when the wave number is greater than 4. The obtained results for the flow rates as a function of the applied current are in qualitative agreement with the existing experimental results.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electromagnetohydrodynamic (EMHD) flow between two transversely wavy microparallel plates

Buren

Jian

2015

Electrophoresis

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“…The question addressed here is whether, in addition to the well-studied Lorentz force, the magnetic gradient force can be used to control and manipulate the flow and possibly influence the mass transfer. This is a departure from our previous work using this same microfluidic chamber 17 , 22 , which focused on manipulation of flow by changing the ionic current density by varying electronic activation of the electrodes, instead of modifying the magnetic field.…”

Section: Introductionmentioning

confidence: 80%

“…One uses an AC electric field which requires electromagnets and synchronized operation conditions to obtain unidirectional flow 16 . A second way involves reversible redox couples to enable sufficient ionic currents with low overpotential which also prevents electrode degradation and heat generation, called redox - MHD 17 – 22 . Many studies dealing with redox-MHD have shown that a small fluid volume can be driven in confined spaces.…”

Section: Introductionmentioning

confidence: 99%

Combining magnetic forces for contactless manipulation of fluids in microelectrode-microfluidic systems

Haehnel

Khan

Mutschke

et al. 2019

Sci Rep

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A novel method to drive and manipulate fluid in a contactless way in a microelectrode-microfluidic system is demonstrated by combining the Lorentz and magnetic field gradient forces. The method is based on the redox-reaction [Fe(CN)6]3−/[Fe(CN)6]4− performed in a magnetic field oriented perpendicular to the ionic current that crosses the gap between two arrays of oppositely polarized microelectrodes, generating a magnetohydrodynamic flow. Additionally, a movable magnetized CoFe micro-strip is placed at different positions beneath the gap. In this region, the magnetic flux density is changed locally and a strong magnetic field gradient is formed. The redox-reaction changes the magnetic susceptibility of the electrolyte near the electrodes, and the resulting magnetic field gradient exerts a force on the fluid, which leads to a deflection of the Lorentz force-driven main flow. Particle Image Velocity measurements and numerical simulations demonstrate that by combining the two magnetic forces, the flow is not only redirected, but also a local change of concentration of paramagnetic species is realized.

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“…A relatively easy-to-use fluid pumping technique of redox MHD has been demonstrated by Zahore, that induces localized fluid circulation [124]. Microfluidic rotational flow was obtained under laminar conditions (Reynolds number <1) between concentric disk-ring microelectrodes), when a constant potential was applied across the electrodes in the presence of an external magnetic field.…”

Section: Microfluidicsmentioning

confidence: 99%

Process intensification: An electrochemical perspective

Scott

2018

Renewable and Sustainable Energy Reviews

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This paper provides a review of a range of process intensification methods which have been applied to electrochemical processes and reactions. The electrochemical reactions include those in electrolysers where gas evolution occurs, in metal deposition reactions and reactions occurring in fuel cells and batteries. The process intensification methods include the use of centrifugal force fields, ultrasonics, rotating electrodes and rotating cells which operate with and without the application of magnetic fields. Such devices can be used in principle to carry out electrolysis without the application of an external potential or current. Other methods considered include the use of light. The area of magnetic field induced fluid flow is also discussed which has applications in lab on a chip technologies. The area of process intensification has largely focused a lot on hydrogen generation as a means of providing a clean, sustainable fuel.

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Microfluidic rotational flow generated by redox-magnetohydrodynamics (MHD) under laminar conditions using concentric disk and ring microelectrodes

Cited by 13 publications

References 27 publications

Electromagnetohydrodynamic (EMHD) flow between two transversely wavy microparallel plates

Electromagnetohydrodynamic (EMHD) flow between two transversely wavy microparallel plates

Combining magnetic forces for contactless manipulation of fluids in microelectrode-microfluidic systems

Process intensification: An electrochemical perspective

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