Analytical solution of two-fluid electro-osmotic flows of viscoelastic fluids

• Type: Article in International Scientific Journal
• Date: 2013

Authors

A. M. Afonso (Author) FEUP; M. A. Alves (Author) FEUP; F. T. Pinho (Author) FEUP

Journal

Title: Journal of Colloid and Interface Science

Vol. 395

Pages: 277-286

ISSN: 0021-9797

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 30 Citations

ISI Web of Science

Scopus - 42 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Associated Projects

ELECTROELASTIC - ELECTROELASTIC – Escoamento por electro-osmose de fluídos viscoelásticos em microgeometrias

Other information

Authenticus ID: P-001-ZXE

DOI: 10.1016/j.jcis.2012.12.013

Abstract (EN): This paper presents an analytical model that describes a two-fluid electro-osmotic flow of stratified fluids with Newtonian or viscoelastic rheological behavior. This is the principle of operation of an electro-osmotic two-fluid pump as proposed by Brask et al. [Tech. Proc. Nanotech., 1, 190-193,2003], in which an electrically non-conducting fluid is transported by the interfacial dragging viscous force of a conducting fluid that is driven by electro-osmosis. The electric potential in the conducting fluid and the analytical steady flow solution of the two-fluid electro-osmotic stratified flow in a planar microchannel are presented by assuming a planar interface between the two immiscible fluids with Newtonian or viscoelastic rheological behavior. The effects of fluid rheology, shear viscosity ratio, holdup and interfacial zeta potential are analyzed to show the viability of this technique, where an enhancement of the flow rate is observed as the shear-thinning effects are increased.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10