A note on the screening of hydrodynamic interactions, in electrophoresis, and in porous media

Authors
Long, D Ajdari, A
Citation
D. Long et A. Ajdari, A note on the screening of hydrodynamic interactions, in electrophoresis, and in porous media, EUR PHY J E, 4(1), 2001, pp. 29-32
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
EUROPEAN PHYSICAL JOURNAL E
ISSN journal
12928941 → ACNP
Volume
4
Issue
1
Year of publication
2001
Pages
29 - 32
Database
ISI
SICI code
1292-8941(200101)4:1<29:ANOTSO>2.0.ZU;2-Z
Abstract
We consider two situations where hydrodynamic interactions are said to be " screened": hydrodynamics in a gel or in a porous medium, and electrophoresi s in an electrolyte. We focus on the corresponding Green functions, and sho w that the flow fields are similar in the two cases. Contrarily to statemen ts often made, the fluid velocity decays algebraically with distance (simil ar or equal to 1/r(3)), i.e. not exponentially. We point out that the press ure fields are different in the two cases.