Drag reduction in electro-osmosis of polymer solutions

Feng Ming Chang; Heng Kwong Tsao

doi:10.1063/1.2735279

Drag reduction in electro-osmosis of polymer solutions

Feng Ming Chang, Heng Kwong Tsao

Department of Chemical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

Electro-osmosis is the preferred transport mechanism in microfluidic systems. Drag reduction in electro-osmosis of polymer solutions is observed due to polymer depletion in the electric double layer (EDL). The well-known Helmholtz-Smoluchowski (HS) equation indicates that the electro-osmosis mobility is inversely proportional to the solution viscosity. For low molecular weight the polymer size (R) is smaller than the EDL thickness (λ) and the HS equation is valid. For high molecular weight (Rλ) the chains in the EDL are partially sheared and the effective viscosity is smaller than the solution viscosity. Salt addition reduces λ and can enhance drag reduction substantially.

Original language	English
Article number	194105
Journal	Applied Physics Letters
Volume	90
Issue number	19
DOIs	https://doi.org/10.1063/1.2735279
State	Published - 2007

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title = "Drag reduction in electro-osmosis of polymer solutions",

abstract = "Electro-osmosis is the preferred transport mechanism in microfluidic systems. Drag reduction in electro-osmosis of polymer solutions is observed due to polymer depletion in the electric double layer (EDL). The well-known Helmholtz-Smoluchowski (HS) equation indicates that the electro-osmosis mobility is inversely proportional to the solution viscosity. For low molecular weight the polymer size (R) is smaller than the EDL thickness (λ) and the HS equation is valid. For high molecular weight (Rλ) the chains in the EDL are partially sheared and the effective viscosity is smaller than the solution viscosity. Salt addition reduces λ and can enhance drag reduction substantially.",

author = "Chang, {Feng Ming} and Tsao, {Heng Kwong}",

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T1 - Drag reduction in electro-osmosis of polymer solutions

AU - Chang, Feng Ming

AU - Tsao, Heng Kwong

N1 - Funding Information: This research work is supported by National Science Council of Taiwan under Grant No. 95-2221-E-008-088.

PY - 2007

Y1 - 2007

N2 - Electro-osmosis is the preferred transport mechanism in microfluidic systems. Drag reduction in electro-osmosis of polymer solutions is observed due to polymer depletion in the electric double layer (EDL). The well-known Helmholtz-Smoluchowski (HS) equation indicates that the electro-osmosis mobility is inversely proportional to the solution viscosity. For low molecular weight the polymer size (R) is smaller than the EDL thickness (λ) and the HS equation is valid. For high molecular weight (Rλ) the chains in the EDL are partially sheared and the effective viscosity is smaller than the solution viscosity. Salt addition reduces λ and can enhance drag reduction substantially.

AB - Electro-osmosis is the preferred transport mechanism in microfluidic systems. Drag reduction in electro-osmosis of polymer solutions is observed due to polymer depletion in the electric double layer (EDL). The well-known Helmholtz-Smoluchowski (HS) equation indicates that the electro-osmosis mobility is inversely proportional to the solution viscosity. For low molecular weight the polymer size (R) is smaller than the EDL thickness (λ) and the HS equation is valid. For high molecular weight (Rλ) the chains in the EDL are partially sheared and the effective viscosity is smaller than the solution viscosity. Salt addition reduces λ and can enhance drag reduction substantially.

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DO - 10.1063/1.2735279

M3 - 期刊論文

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SN - 0003-6951

VL - 90

JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Drag reduction in electro-osmosis of polymer solutions

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