Microfabricated electrohydrodynamic pumps

Bart, Stephen F.; Tavrow, Lee S.; Mehregany, Mehran; Lang, J.

doi:10.1016/0924-4247(90)85037-5

Cited by 170 publications

(73 citation statements)

References 10 publications

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“…Most fluidic devices generate internal flow through microchannels in glass or silicon using electro-osmosis (Stone et al 2004), electrohydrodynamics (Bart et al 1990), magnetohydrodynamics (Jang et al 2000), centrifugation (Duffy et al 1999), or pressure gradients (Pfahler et al 1990). Driving mechanisms based on surface stresses, however, are particularly effective for free surface flows, given the large surface to volume ratio intrinsic to microscale systems.…”

Section: Introductionmentioning

confidence: 99%

Principles of Microfluidic Actuation by Modulation of Surface Stresses

Darhuber

Troian

2005

Annu. Rev. Fluid Mech.

440

340

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Development and optimization of multifunctional devices for fluidic manipulation of films, drops, and bubbles require detailed understanding of interfacial phenomena and microhydrodynamic flows. Systems are distinguished by a large surface to volume ratio and flow at small Reynolds, capillary, and Bond numbers are strongly influenced by boundary effects and therefore amenable to control by a variety of surface treatments and surface forces. We review the principles underlying common techniques for actuation of droplets and films on homogeneous, chemically patterned, and topologically textured surfaces by modulation of normal or shear stresses.

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Section: Introductionmentioning

confidence: 99%

Principles of Microfluidic Actuation by Modulation of Surface Stresses

Darhuber

Troian

2005

Annu. Rev. Fluid Mech.

440

340

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“…Various other pumping ideas were proposed to overcome the valve problem associated with positive displacement pumps. Electrohydrodynamic pumps utilize dielectric fluids, where the induced charges in the fluid will displace due to the moving electric field passing through it [5]. Electrokinetic pumps, similar to electrohydrodynamic pumps, use the moving electric field to displace the ions in the electric double layer of the electrolyte, rather than the charges in a dielectric fluid [6].…”

Section: Introductionmentioning

confidence: 99%

Transient Behavior of the Viscous Micropump

Abdelgawad

Hassan

Esmail

2004

Microscale Thermophysical Engineering

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In the present study, the transient performance of the viscous micropump will be investigated numerically. The viscous micropump's operation depends mainly on viscous forces and can operate in any situation where viscous forces are dominant. All the micropump calculations are reported in nondimensional quantities, which allows for the prediction of the micropump performance, regardless of the dimensions or the fluid that is used. The effect of the microchannel height, rotor eccentricity, Reynolds number, and pump load on the transient performance of the viscous micropump has been studied in detail. The steady state performance was compared with the available experimental data and was found to be in a very good agreement. The rotor eccentricity was determined to be the parameter that affected the transient performance of the micropump the most significantly. This work provides a foundation for future research on the subject of fluid phenomena in viscous micropumps.

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“…Different transport mechanisms have been utilized in microfluidic devices including pressure gradients, 5 electrophoresis and electro-osmosis, 6 electrohydrodynamics, 7 magnetohydrodynamics, 8,9 centrifugation 10 and thermocapillary pumping ͑TCP͒. 11 The TCP technique uses heating elements exterior to a closed channel to modify the surface tension at one end of a liquid plug.…”

Section: Introductionmentioning

confidence: 99%

Thermocapillary actuation of liquid flow on chemically patterned surfaces

et al. 2003

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We have investigated the thermocapillary flow of a Newtonian liquid on hydrophilic microstripes which are lithographically defined on a hydrophobic surface. The speed of the microstreams is studied as a function of the stripe width w, the applied thermal gradient ͉dT/dx͉ and the liquid volume V deposited on a connecting reservoir pad. Numerical solutions of the flow speed as a function of downstream position show excellent agreement with experiment. The only adjustable parameter is the inlet film height, which is controlled by the ratio of the reservoir pressure to the shear stress applied to the liquid stream. In the limiting cases where this ratio is either much smaller or much larger than unity, the rivulet speed shows a power law dependency on w, ͉dT/dx͉ and V.In this study we demonstrate that thermocapillary driven flow on chemically patterned surfaces can provide an elegant and tunable method for the transport of ultrasmall liquid volumes in emerging microfluidic technologies.

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Microfabricated electrohydrodynamic pumps

Cited by 170 publications

References 10 publications

Principles of Microfluidic Actuation by Modulation of Surface Stresses

Principles of Microfluidic Actuation by Modulation of Surface Stresses

Transient Behavior of the Viscous Micropump

Thermocapillary actuation of liquid flow on chemically patterned surfaces

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