On the behaviour of gelled fibre suspensions in steady shear

Autor:	William J. Frith, Duncan A. White, Bettina Wolf, John R. Melrose
Rok vydání:	2007
Předmět:	Flow visualization Shearing (physics) Materials science business.industry Relative viscosity Condensed Matter Physics Rod law.invention Optics Optical microscope Rheology law Newtonian fluid General Materials Science Composite material business Natural fiber
Zdroj:	Rheologica Acta. 46:531-537
ISSN:	1435-1528 0035-4511
DOI:	10.1007/s00397-006-0143-x
Popis:	The shear rheological properties of suspensions of gelled agar fibres in a low viscosity Newtonian matrix fluid were investigated. Two classes of fibres, low aspect ratio fibres and high aspect ratio fibres with an aspect ratio of the order of 10 and 100 respectively were included in the investigations. For all fibre phase volumes investigated, from as low as 0.01 upwards, the flow curves are characterised by an apparent yield stress followed by shear-thinning which was independent of the fibre aspect ratio. Based on our analysis of the flow curves, we conclude that the high aspect ratio fibres behave like flexible threads in contrast to the low aspect ratio fibres whose high shear relative viscosity is successfully described by a relation for long rigid rods. These findings are supported by flow visualisation using an optical shearing stage coupled to a light microscope.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7c4a9b810fbc9389eacbeaa7b6f3801d https://doi.org/10.1007/s00397-006-0143-x Zobrazit plný text záznamu Full text from SpringerLink