Electroosmotic flow of non-Newtonian fluid in microchannels

Tang, G.H.; Li, X.F.; He, Yingli; Tao, Wen‐Quan

doi:10.1016/j.jnnfm.2008.11.002

Cited by 203 publications

(104 citation statements)

References 24 publications

(27 reference statements)

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“…27 Various studies involving power law and viscoelastic fluid models are available to characterize the flow behavior 28,29 and heat transfer to quantify the Nusselt number [30][31][32][33] in impervious conduits. An excellent example of microfluidic technique for molecular sensing has been described by Chang and Yossifon.…”

Section: Introductionmentioning

confidence: 99%

Effects of non-Newtonian power law rheology on mass transport of a neutral solute for electro-osmotic flow in a porous microtube

Mondal

2013

Biomicrofluidics

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Mass transport of a neutral solute for a power law fluid in a porous microtube under electro-osmotic flow regime is characterized in this study. Combined electroosmotic and pressure driven flow is conducted herein. An analytical solution of concentration profile within mass transfer boundary layer is derived from the first principle. The solute transport through the porous wall is also coupled with the electro-osmotic flow to predict the solute concentration in the permeate stream. The effects of non-Newtonian rheology and the operating conditions on the permeation rate and permeate solute concentration are analyzed in detail. Both cases of assisting (electro-osmotic and poiseulle flow are in same direction) and opposing flow (the individual flows are in opposite direction) cases are taken care of. Enhancement of Sherwood due to electro-osmotic flow for a non-porous conduit is also quantified. Effects if non-Newtonian rheology on Sherwood number enhancement are observed. V C 2013 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Effects of non-Newtonian power law rheology on mass transport of a neutral solute for electro-osmotic flow in a porous microtube

Mondal

2013

Biomicrofluidics

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“…Electro-osmotic flows of non-Newtonian fluids in the microchannels were also addressed theoretically. [16][17][18][19][20][21][22][23] Recently, experimental investigations 24,25 were performed for the electro-osmotic flow of a typical polymer solution in microchannels. In addition, the generalized Helmholtz-Smoluchowski velocity derived in Ref.…”

Section: Introductionmentioning

confidence: 99%

Electro-osmotic mobility of non-Newtonian fluids

Zhao

Yang

2011

Biomicrofluidics

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Electrokinetically driven microfluidic devices are usually used to analyze and process biofluids which can be classified as non-Newtonian fluids. Conventional electrokinetic theories resulting from Newtonian hydrodynamics then fail to describe the behaviors of these fluids. In this study, a theoretical analysis of electro-osmotic mobility of non-Newtonian fluids is reported. The general Cauchy momentum equation is simplified by incorporation of the Gouy-Chapman solution to the Poisson-Boltzmann equation and the Carreau fluid constitutive model. Then a nonlinear ordinary differential equation governing the electro-osmotic velocity of Carreau fluids is obtained and solved numerically. The effects of the Weissenberg number ͑Wi͒, the surface zeta potential ͑ s ͒, the power-law exponent ͑n͒, and the transitional parameter ͑␤͒ on electro-osmotic mobility are examined. It is shown that the results presented in this study for the electro-osmotic mobility of Carreau fluids are quite general so that the electro-osmotic mobility for the Newtonian fluids and the power-law fluids can be obtained as two limiting cases.

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“…Most of the available research on non-Newtonian liquid flow in microchannels with consideration of electroosmotic forces is devoted to pure EOFs (e.g., see Zhao et al 2008;Tang et al 2009;Vasu and De 2010;Zhao and Yang 2011;Ng and Qi 2013;Huang and Yao 2014), and there are only a handful number of studies targeting hydrodynamic aspects of the PDEOF counterparts in the literature. Berli and Olivares (2008), for example, theoretically obtained solutions for predicting the flow rate and electric current of non-Newtonian fluids as functions of simultaneously applied electric potential and pressure gradients in slit and cylindrical microchannels.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Nonlinear Electrokinetic and Rheological Behaviors of Typical Non-Newtonian Biofluids through Annular Microchannels

Hamedi¹,

Shamshiri

Charmiyan³

et al. 2016

JAFM

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Electroosmosis is the predominant mechanism for flow generation in lab-on-chip devices. Since most biofluids encountered in these devices reveal non-Newtonian behavior, a special understanding of the fundamental physics of the relevant transport phenomena seems vital for an accurate design of such miniaturized devices. In this study, a numerical analysis is presented to explore transport characteristics of typical non-Newtonian biofluids through annular microchannels under combined action of pressure and electrokinetic forces. The flow is considered steady and hydrodynamically fully developed. A finite difference method is used to solve the Poisson-Boltzmann and Cauchy momentum equations, while the classical boundary condition of no velocity-slip for the flow field is applied. The Poisson-Boltzmann equation is solved in the exact form without using the Debye-Hückel approximation. After numerically solving the governing equations, role of the key parameters in hydrodynamic behavior of the flow is analyzed and discussed. Keywords

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Electroosmotic flow of non-Newtonian fluid in microchannels

Cited by 203 publications

References 24 publications

Effects of non-Newtonian power law rheology on mass transport of a neutral solute for electro-osmotic flow in a porous microtube

Effects of non-Newtonian power law rheology on mass transport of a neutral solute for electro-osmotic flow in a porous microtube

Electro-osmotic mobility of non-Newtonian fluids

Investigation of Nonlinear Electrokinetic and Rheological Behaviors of Typical Non-Newtonian Biofluids through Annular Microchannels

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