Dissipative structures in shear-thickening complex fluids

Complex flows are described, including shear thinning, shear thickening, and yield-stress. Mechanisms of changing viscosity in dense suspensions are explored, including the relevance of the lubrication approximation, dilatency, and the spaghetti model of polymers. Liquid crystal alignment is discussed, and model equations are introduced for flows in packed beds. The viscosity of synovial fluid is described, and equations to combine viscous and elastic behaviors are obtained.

Download Full-text

Rheological modelling of complex fluids: II. Shear thickening behavior due to shear induced flocculation

The European Physical Journal Applied Physics ◽

10.1051/epjap:1998170 ◽

1998 ◽

Vol 2 (2) ◽

pp. 175-181 ◽

Cited By ~ 8

Author(s):

D. Quemada

Keyword(s):

Complex Fluids ◽

Shear Thickening ◽

Rheological Modelling ◽

Thickening Behavior

Download Full-text

Scattering Methods in Complex Fluids

10.1017/cbo9781139034241 ◽

2015 ◽

Cited By ~ 5

Author(s):

Sow-Hsin Chen ◽

Piero Tartaglia

Keyword(s):

Complex Fluids

Download Full-text

Structure of a shear-thickening polysaccharide extracted from the New Zealand black tree fern, Cyathea medullaris

10.26686/wgtn.12597809.v1 ◽

2020 ◽

Author(s):

M Wee ◽

M Mastrangelo ◽

Susan Carnachan ◽

Ian Sims ◽

K Goh

Keyword(s):

New Zealand ◽

Uronic Acid ◽

Average Molecular Weight ◽

Shear Thickening ◽

Water Soluble ◽

Size Exclusion ◽

Resonance Spectroscopy ◽

Tree Fern ◽

13C Nuclear Magnetic Resonance ◽

Exclusion Chromatography

A shear-thickening water-soluble polysaccharide was purified from mucilage extracted from the fronds of the New Zealand black tree fern (Cyathea medullaris or 'mamaku' in Māori) and its structure characterised. Constituent sugar analysis by three complementary methods, combined with linkage analysis (of carboxyl reduced samples) and 1H and 13C nuclear magnetic resonance spectroscopy (NMR) revealed a glucuronomannan comprising a backbone of 4-linked methylesterified glucopyranosyl uronic acid and 2-linked mannopyranosyl residues, branched at O-3 of 45% and at both O-3 and O-4 of 53% of the mannopyranosyl residues with side chains likely comprising terminal xylopyranosyl, terminal galactopyranosyl, non-methylesterified terminal glucopyranosyl uronic acid and 3-linked glucopyranosyl uronic acid residues. The weight-average molecular weight of the purified polysaccharide was ~1.9×106Da as determined by size-exclusion chromatography coupled with multi-angle laser light scattering (SEC-MALLS). The distinctive rheological properties of this polysaccharide are discussed in relation to its structure. © 2014 Elsevier B.V.

Download Full-text