Title
Proposed lower bound for the shear viscosity to entropy density ratio in some dense liquids
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Physics letters: A. - Amsterdam, 1967, currens
Volume/pages
373(2009) :10 , p. 992-998
ISSN
0375-9601
ISI
000264424200018
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Starting from relativistic quantum field theories, Kovtun et al. (2005) have quite recently proposed a lower bound ç/s/(4ðkB), where ç is the shear viscosity and s the volume density of entropy for dense liquids. If their proposal can eventually be proved, then this would provide key theoretical underpinning to earlier semiempirical proposals on the relation between a transport coefficient ç and a thermodynamic quantity s. Here, we examine largely experimental data on some dense liquids, the insulators nitrogen, water, and ammonia, plus the alkali metals, where the shear viscosity ç(T) for the four heaviest alkalis is known to scale onto an almost universal curve, following the work of Tankeshwar and March a decade ago. So far, all known results for both insulating and metallic dense liquids correctly exceed the lower bound prediction of Kovtun et al.
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