Magneto-hydrodynamics based microfluidics

Qian, Shizhi; Bau, Haim H.

doi:10.1016/j.mechrescom.2008.06.013

Cited by 182 publications

(86 citation statements)

References 43 publications

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“…Qian and Bau gave a comprehensive review on MHD-based microfluidics (Qian 2009). In addition to Maxwell's equation and continuity equation, the flow of a conducting fluid in a magnetic field is governed by NavierStokes equation with the additional term of Lorentz force:…”

Section: Electrically Conducting Fluidsmentioning

confidence: 99%

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Nguyen

2011

Microfluid Nanofluid

336

169

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Micro-magnetofluidics refers to the science and technology that combines magnetism with microfluidics to gain new functionalities. Magnetism has been used for actuation, manipulation and detection in microfluidics. In turn, microfluidic phenomena can be used for making tunable magnetic devices. This paper presents a systematic review on the interactions between magnetism and fluid flow on the microscale. The review rather focuses on physical and engineering aspects of micro-magnetofluidics, than on the biological applications which have been addressed in a number of previous excellent reviews. The field of micromagnetofluidics can be categorized according to the type of the working fluids and the associated microscale phenomena of established research fields such as magnetohydrodynamics, ferrohydrodynamics, magnetorheology and magnetophoresis. Furthermore, similar to microfluidics the field can also be categorized as continuous and digital micro-magnetofluidics. Starting with the analysis of possible magnetic forces in microscale and the impact of miniaturization on these forces, the paper revisits the use of magnetism for controlling fluidic functions such as pumping, mixing, magnetowetting as well as magnetic manipulation of particles. Based on the observations made with the state of the art of the field micro-magnetofluidics, the paper presents some perspectives on the possible future development of this field. While the use of magnetism in microfluidics is relatively established, possible new phenomena and applications can be explored by utilizing flow of magnetic and electrically conducting fluids.

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Section: Electrically Conducting Fluidsmentioning

confidence: 99%

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Nguyen

2011

Microfluid Nanofluid

336

169

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“…This phenomenon is commonly referred to as magneto-hydrodynamics and has been utilized, among other things, to pump fluids in microfluidic conduits (Qian and Bau 2005; Jang and Lee 2000; Lemoff and Lee 2000; Leventis and Gao 2001;West et al 2002 and2003;Zhong et al 2002;Eijkel et al 2003;Harrison 2003a and2003b;Arumugam et al 2005 and2006;Aguilar et al 2006;Nguyen and Kassegne 2008), control fluid flow in microfluidic networks without a need for mechanical pumps and valves (Bau et al 2003); stir and mix fluids (Bau et al 2001;Yi et al 2002;Xiang and Bau 2003;Qian and Bau 2005;Gleeson and West 2002;West et al 2003;Gleeson et al 2004); and enhance mass transfer next to electrodes' surfaces (Boum and Alemany 1999;Lioubashevski et al 2004;Alemany and Chopart 2007). For a recent review of a few applications of MHD in microfluidics, see Qian and Bau (2009)…”

Section: Introductionmentioning

confidence: 99%

When MHD-based microfluidics is equivalent to pressure-driven flow

Qin

Bau

2010

Microfluid Nanofluid

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Magnetohydrodynamics (MHD) provides a convenient, programmable means for propelling liquids and controlling fluid flow in microfluidic devices without a need for mechanical pumps and valves. When the magnetic field is uniform and the electric field in the electrolyte solution is confined to a plane that is perpendicular to the direction of the magnetic field, the Lorentz body force is irrotational and one can define a "Lorentz" potential. Since the MHD-induced flow field under these circumstances is identical to that of pressure-driven flow, one can utilize the large available body of knowledge about pressure-driven flows to predict MHD flows and infer MHD flow patterns. In this note, we prove the equivalence between MHD flows and pressure-driven flows under certain conditions other than flow in straight conduits with rectangular crosssections. We determine the velocity profile and the efficiency of MHD pumps, accounting for current transport in the electrolyte solutions. Then, we demonstrate how data available for pressure driven flow can be utilized to study various MHD flows, in particular, in a conduit patterned with pillars such as may be useful for liquid chromatography and chemical reactors. Additionally, we examine the effect of interior obstacles on the electric current flow in the conduit and show the existence of a particular pillar geometry that maximizes the current. solution is confined to a plane that is perpendicular to the direction of the magnetic field, the Lorentz body force is irrotational and one can define a "Lorentz" potential. Since the MHDinduced flow field under these circumstances is identical to that of pressure-driven flow, one can utilize the large available body of knowledge about pressure-driven flows to predict MHD flows and infer MHD flow patterns. In this note, we prove the equivalence between MHD flows and pressure-driven flows under certain conditions other than flow in straight conduits with rectangular cross-sections. We determine the velocity profile and the efficiency of MHD pumps, accounting for current transport in the electrolyte solutions. Then, we demonstrate how data available for pressure driven flow can be utilized to study various MHD flows, in particular, in a conduit patterned with pillars such as may be useful for liquid chromatography and chemical reactors. Additionally, we examine the effect of interior obstacles on the electric current flow in the conduit and show the existence of a particular pillar geometry that maximizes the current.

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“…In addition, the MHD flows of electrically conducting fluid through porous media have wide range of applications, for example, geothermal energy technology, petroleum drillings (Mishra et al 2013). In microfluidics, MHD is studied for designing micropumps for precisely producing a continuous, nonpulsating flow in complex microchannels (Qian and Bau 1998). Furthermore the magnetic field has been utilized to confine plasma within the shape of a torus in a tokamak which is a magnetic confinement device for  producing controlled thermonuclear fusion power.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Two-Dimensional Unsteady Magnetohydrodynamic Compressible Flow through a Porous Medium

Pakdee

Yuvakanit

Hussein

2017

JAFM

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In the present study, the unsteady magnetrohydrodynamic (MHD) flow of compressible fluid with variable thermal properties has been numerically investigated. The electrically conducting fluid flows through a porous media channel. The uniform magnetic field is applied perpendicular to the direction of the flow. The wall is assumed to be non-conducting and maintained at two different temperatures. The thermal conductivity and viscosity of the fluid change with temperature. Sixth -Order Accurate Compact Finite Difference scheme together with the Third-order Runge-Kutta method is used to solve a set of non-linear equations. The results of the calculation are expressed in the form of the velocity and temperature at different values of the magnetic field and porosity. The proposed mathematical model and numerical methods have been validated by comparing with the results of previously published studies that the compared results reveal the same trends. The difference is due to the compressibility and property variation effects. The results showed that the magnetic field and variable properties considerably influences the flows that is compressible thereby affecting the heat transfer as well as the wall shear stress.

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Magneto-hydrodynamics based microfluidics

Cited by 182 publications

References 43 publications

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

When MHD-based microfluidics is equivalent to pressure-driven flow

Numerical Analysis on the Two-Dimensional Unsteady Magnetohydrodynamic Compressible Flow through a Porous Medium

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