Dynamical role of slip heterogeneities in confined flows

Autor:	Choongyeop Lee, Patrick Tabeling, Anne-Laure Vayssade, Fabrice Monti, Emmanuel Terriac, Michel Cloitre
Rok vydání:	2014
Předmět:	Physics::Fluid Dynamics Length scale Mechanics Slip (materials science) Geology
Zdroj:	Physical Review E. 89
ISSN:	1550-2376 1539-3755
DOI:	10.1103/physreve.89.052309
Popis:	We demonstrate that flows in confined systems are controlled by slip heterogeneities below a certain size. To show this we image the motion of soft glassy suspensions in microchannels whose inner walls impose different slip velocities. As the channel height decreases, the flow ceases to have the symmetric shape expected for yield-stress fluids. A theoretical model accounts for the role of slip heterogeneities and captures the velocity profiles. We generalize these results by introducing a length scale, valid for all fluids, below which slip heterogeneities dominate the flow in confined systems. General implications of this notion, concerning the interplay between slip and confinement, are presented.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::404343d0da9aa61358a268cd612d2e85 https://doi.org/10.1103/physreve.89.052309 Zobrazit plný text záznamu