Rheological aspects of dense lignite-water suspensions; structure development on consecutive flow loops

Aspects of dense lignite–water slurries (LWS) rheology were investigated using controlled stress and controlled strain rheometers with parallel disks and Couette geometries. During the preparation of the slurries, the achieved solids volume fractions were up to 0.425 and the particle size distributi...

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Bibliographic Details
Published in:Rheologica acta 2007-01, Vol.46 (3), p.357-367
Main Authors: GOUDOULAS, Thomas B, KASTRINAKIS, Eleftherios G, NYCHAS, Stavros G
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Disks
Earth sciences
Earth, ocean, space
Exact sciences and technology
Lignite
Physical properties of sedimentary rocks
Rheological properties
Rheology
Rheometers
Sedimentary rocks
Slurries
Yield stress
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Summary:Aspects of dense lignite–water slurries (LWS) rheology were investigated using controlled stress and controlled strain rheometers with parallel disks and Couette geometries. During the preparation of the slurries, the achieved solids volume fractions were up to 0.425 and the particle size distributions were polydispersed with sizes up to 300 μm. In the ascending parts of consecutive flow loops, a slope transition of the flow curve was observed and studied in relation to the solids volume fraction. The obtained results with the different geometries and rheometers were qualitatively the same. By following the model proposed by Cheng (Rheol Acta 42:372–382, 2003) for thixotropic fluids, and taking into account the yield stress appearance, a suitable correlation for LWS is proposed, which is consistent with the experimental flow curves.
ISSN:0035-4511
1435-1528
DOI:10.1007/s00397-006-0127-x