Evaluation of electro-osmotic pumping effect on microporous media flow

Bai, Li; Zhou, Wenning; Yan, Yuying; Tian, Changqing

doi:10.1016/j.applthermaleng.2012.09.014

Cited by 16 publications

(10 citation statements)

References 27 publications

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“…Packed channels, similar to the columns used in electro-chromatography, can be used to pump fluid through porous media (Paul et al, 1998). Li, Zhou, Yan and Tian (2013) examined, experimentally and numerically, the combined effect of gravitational force and electro-osmosis on flow rate in micro-porous media, for filtering applications, demonstrating the effectiveness of electro-osmosis pumping at micro-scale (less than 1 · 10 −4 mm). Experimental results showed that electro-osmosis effect is responsible for around 15-20% of the total flow rate.…”

Section: Microscopic Approachmentioning

confidence: 99%

Modelling electro-osmotic flow in porous media: a review

Fraia

Massarotti

Nithiarasu

2018

HFF

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Purpose This paper aims to provide a comprehensive literature review on modelling electro-osmotic flow in porous media. Design/methodology/approach Modelling electro-osmosis in fluid systems without solid particles has been first introduced. Then, after a brief description of the existing approaches for porous media modelling, electro-osmotic flow in porous media has been considered by analysing the main contributions to the development of this topic. Findings The analysis of literature has highlighted the absence of a universal model to analyse electro-osmosis in porous media, whereas many different methods and assumptions are used. Originality/value For the first time, the existing approaches for modelling electro-osmotic flow in porous have been collected and analysed to provide detailed indications for future works concerning this topic.

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Section: Microscopic Approachmentioning

confidence: 99%

Modelling electro-osmotic flow in porous media: a review

Fraia

Massarotti

Nithiarasu

2018

HFF

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“…Literature review 1.1.1. Electro-osmotic flow history and applications The electrokinetic phenomenon was first observed by Reuss in 1809, when he observed that water moved through soil pores when an electric potential was applied (Li et al, 2013, Wang et al, 2009. In the mid and late 1900 this effect was more widely studied and applied in fields such as drug delivery, chemical analysis (Wang et al, 2009) and soil stabilization (Pillai et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…A variety of numerical methods have been developed to predict electrokinetic and electrohydrodynamic problems. These models are usually based on combinations of the Navier-Stokes equation for fluid flow and the Poisson-Boltzmann equation for electric potential distribution (Li et al, 2013). Amongst the applications of electro-osmotic flow are: electrokinetic treatment of contaminated soil (Cameselle, 2015, Sahoo et al 2009, electro-osmotic pumps (Li et al, 2013, Wang et al, 2009, flow mixing in microchannel (Peng and Li, 2015) and electric field-driven microreactor (Susarrey-Arce et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Electro-osmotic pumping have been found to be more effective and advantageous on micro-porous systems than pressure-driven mechanisms alone (Li et al, 2013). A few of the primary advantages of this application are the absence of mechanical moving parts of the pump, the possibility to instantly switch flow directions and the capability of generating constant pulse free flows (Wang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Simulation of a Perfect Dielectric Drop in Electro-Osmotic Flow of an Electrolyte Through a Microchannel

Felisberto¹,

Teixeira²

2017

jCEC

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This research uses a computational fluid dynamic model to simulate motion and deformation of a dielectric drop in electrolyte solution in a microchannel. Wall charge density, the Debye-Hückel parameter and the Weber number are varied for uncharged, positively and negatively charged drop interfaces. Drop flow and deformation were analysed and the effects of charge distribution, electric field and permittivity jump were discussed. For a positively charged channel wall, negatively charged drops moved faster and positively charged drops moved slower than an uncharged drop. This effect increased for a higher We. Vortex flow was observed inside the drop. For a low surface tension, the drops were elongated due to electric forces acting on its surface with the charged drops deforming more than the uncharged one. When the permittivity component of the force was removed, the drop had a horizontal deformation that was sufficiently high to cause the negatively charged drop to break up.

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“…Microfluidic channels integrated with embedded obstacles offer the following advantages compared to plain microfluidic channels: (i) enhanced heat and mass transfer coefficients [5,6,7,8]; (ii) increased mixing efficiency [9,10,11]; and (iii) they allow chemotaxis gradients [12,13]. Therefore, fluid flow in porous media on the micro-scale has been applied in micro-reactors [14], micro-separators [15], micro-heat exchangers [16], micro-pumps [17], and micro-filters [18]. Despite their widespread applications, increasing the shear force near microstructures in porous media leads to augmented pressure drops [19].…”

Section: Introductionmentioning

confidence: 99%

The Deformation of Polydimethylsiloxane (PDMS) Microfluidic Channels Filled with Embedded Circular Obstacles under Certain Circumstances

Roh

Lee

Jung³

2016

Molecules

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Abstract:Experimental investigations were conducted to determine the influence of polydimethylsiloxane (PDMS) microfluidic channels containing aligned circular obstacles (with diameters of 172 µm and 132 µm) on the flow velocity and pressure drop under steady-state flow conditions. A significant PDMS bulging was observed when the fluid flow initially contacted the obstacles, but this phenomenon decreased in the 1 mm length of the microfluidic channels when the flow reached a steady-state. This implies that a microfluidic device operating with steady-state flows does not provide fully reliable information, even though less PDMS bulging is observed compared to quasi steady-state flow. Numerical analysis of PDMS bulging using ANSYS Workbench showed a relatively good agreement with the measured data. To verify the influence of PDMS bulging on the pressure drop and flow velocity, theoretical analyses were performed and the results were compared with the experimental results. The measured flow velocity and pressure drop data relatively matched well with the classical prediction under certain circumstances. However, discrepancies were generated and became worse as the microfluidic devices were operated under the following conditions: (1) restricted geometry of the microfluidic channels (i.e., shallow channel height, large diameter of obstacles and a short microchannel length); (2) operation in quasi-steady state flow; (3) increasing flow rates; and (4) decreasing amount of curing agent in the PDMS mixture. Therefore, in order to obtain reliable data a microfluidic device must be operated under appropriate conditions.

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Evaluation of electro-osmotic pumping effect on microporous media flow

Cited by 16 publications

References 27 publications

Modelling electro-osmotic flow in porous media: a review

Modelling electro-osmotic flow in porous media: a review

Simulation of a Perfect Dielectric Drop in Electro-Osmotic Flow of an Electrolyte Through a Microchannel

The Deformation of Polydimethylsiloxane (PDMS) Microfluidic Channels Filled with Embedded Circular Obstacles under Certain Circumstances

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