期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 344, 期 2, 页码 513-520出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.01.025
关键词
Electro-osmotic flow; Parallel plates; PTT model; Viscoelastic fluid; Analytical study; Constitutive flow instability
资金
- Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/EME-MFE/70186/2006, PTDC/EQU-FTT/71800/2006]
- FCT [SFRH/BD/28828/2006]
- Fundação para a Ciência e a Tecnologia [PTDC/EME-MFE/70186/2006, PTDC/EQU-FTT/71800/2006, SFRH/BD/28828/2006] Funding Source: FCT
The electro-osmotic flow of a viscoelastic fluid between parallel plates is investigated analytically. The rheology of the fluid is described by the Phan-Thien-Tanner model. This model uses the Gordon-Schowalter convected derivative, which leads to a non-zero second normal stress difference in pure shear flow. A nonlinear Poisson-Boltzmann equation governing the electrical double-layer field and a body force generated by the applied electrical potential field are included in the analysis. Results are presented for the velocity and stress component profiles in the microchannel for different parametric values that characterize this flow. Equations for the critical shear rates and maximum electrical potential that can be applied to maintain a steady fully developed flow are derived and discussed. (C) 2010 Elsevier Inc. All rights reserved.
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