A technique to obtain the underlying carrier fluid rheology from wide size distribution suspensions using a small pipe viscometer

Pullum, L, Chryss, A, Graham, L and Slatter, P 2008, 'A technique to obtain the underlying carrier fluid rheology from wide size distribution suspensions using a small pipe viscometer', in Jerzy Sobota, Sergei Ivanov, Victor Alexandrov (ed.) 14th International Conference on Transport and Sedimentation of Solid Particles, Russia, 23-27 June 2008, pp. 350-356.


Document type: Conference Paper
Collection: Conference Papers

Title A technique to obtain the underlying carrier fluid rheology from wide size distribution suspensions using a small pipe viscometer
Author(s) Pullum, L
Chryss, A
Graham, L
Slatter, P
Year 2008
Conference name 14th International Conference on Transport and Sedimentation of Solid Particles
Conference location Russia
Conference dates 23-27 June 2008
Proceedings title 14th International Conference on Transport and Sedimentation of Solid Particles
Editor(s) Jerzy Sobota, Sergei Ivanov, Victor Alexandrov
Publisher Saint Petersburg Mining Institute
Place of publication Russia
Start page 350
End page 356
Total pages 7
Abstract There is increasing interest in the hydraulic transport of high concentration, wide size distribution suspensions in laminar flow. Such suspensions generally stratify in pipe flow. The coarse burden, made from the larger particles, is conveyed in a non-Newtonian, visco-plastic carrier fluid made from the finer particles and conveying water. The rheological properties of the carrier fluid only are required for the successful design of such systems, which use a two-layer mechanistic modelling approach. Experimental studies made in Australia and South Africa during the AMIRA P599 projects have shown that surprisingly small particles will stratify under laminar flow conditions, but the exact size of the smallest particle to contribute to the coarse burden is unknown. Similarly, while the rheological behaviour of the carrier fluid is dominated by the influence of the very smallest particles, larger particles also influence the carrier's rheology and this upper bound is similarly unknown. Such limits cannot be theoretically ascertained as the interaction between the phases is rheologically complex. The variability of industrial suspensions makes the situation worse. Screening out of all the coarser particles, so that the rheology of the carrier fluid only can be measured, is a possible approach. However, this is practically very difficult, especially for smaller particles in yield stress fluids. This paper introduces a practical technique for determining the rheology of the carrier fluid only. This is obtained from a sample that has been only cursorily screened from the entire suspension.
Subjects Rheology
Keyword(s) rheology
suspension
hydraulic conveying
visco-plastic
settling
viscometer.
Copyright notice Copyright 2008 Saint Petersburg Mining Institute
ISBN 9785942113506
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