Coquand, O. and Sperl, M. (2021). Rheology of granular liquids in extensional flows: Beyond the mu(I)-law. Phys. Rev. E, 104 (1). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2470-0053

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Abstract

The Granular Integration Through Transients (GITT) formalism gives a theoretical description of the rheology of moderately dense granular flows and suspensions. In this work, we extend the GITT equations beyond the case of simple shear flows studied before. Applying this to the particular example of extensional flows, we show that the predicted behavior is somewhat different from that of the more frequently studied simple shear case, as illustrated by the possibility of nonmonotonous evolution of the effective friction coefficient mu with the inertial number Z. By the reduction of the GITT equations to simple toy models, we provide a generalization of the mu(Z)-law true for any type of flow deformation. Our analysis also includes a study of the Trouton ratio, which is shown to behave quite similarly to that of dense colloidal suspensions.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Coquand, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sperl, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-576147
DOI: 10.1103/PhysRevE.104.014604
Journal or Publication Title: Phys. Rev. E
Volume: 104
Number: 1
Date: 2021
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2470-0053
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MODE-COUPLING THEORY; SUSPENSIONS; MOTION; FLUIDS; MASS; LAWMultiple languages
Physics, Fluids & Plasmas; Physics, MathematicalMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/57614

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