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Effect of near-wall lift on frictional characteristics of sand slurries
GIW Industries Inc..
Queen's University.
2004 (English)In: Papers presented at Hydrotransport, 16th international conference / [ed] Nígel Heywood, Cranfield, UK: BHR Group Limited , 2004, p. 443-454Conference paper, Published paper (Refereed)
Abstract [en]

The frictional characteristics of a fine-sand and medium-sand slurry were evaluated experimentally in a 0.1 m diameter pipeline loop system at the GIW Hydraulic Test Laboratory. The median particle sizes were 85 and 400 μm. For velocities of practical interest in the interval 1.5 to 3 m/s, and volumetric concentrations of solids from 12 to 34%, the fine-sand slurry behaved essentially as an equivalent fluid. With the medium sand at 17% concentration, the excess losses over those of water were high at low velocities, decreased with increasing velocity and dropped below the equivalent-fluid curve at about 4.2 m/s. This behaviour was related to an inertial hydrodynamic lift force that is effective in driving particles in the medium-sand size range away from the wall. A lift coefficient is defined for the inertial lift force associated with the log-law turbulent velocity profile. In the buffer zone nearer the pipe wall, it is proposed that this lift diminishes in a way that depends on a dimensionless ratio that includes the particle radius and the shear velocity. This trend is seen to be in general agreement with both the medium-sand and the fine-sand data.

Place, publisher, year, edition, pages
Cranfield, UK: BHR Group Limited , 2004. p. 443-454
National Category
Water Engineering
Research subject
Water Resources Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-38595Local ID: d0a51f60-070b-11dd-97e0-000ea68e967bISBN: 1-85598-054-1 (print)OAI: oai:DiVA.org:ltu-38595DiVA, id: diva2:1012095
Conference
International Conference on Hydrotransport : 26/04/2004 - 28/04/2004
Note
Godkänd; 2004; 20080410 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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Sellgren, Anders

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