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The effect of particle shape on pipeline friction for newtonian slurries of fine particles
Author(s) -
Schaan Jason,
Sumner Robert J.,
Gillies Randall G.,
Shook Clifton A.
Publication year - 2000
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450780414
Subject(s) - slurry , laminar flow , turbulence , viscosity , mechanics , particle (ecology) , materials science , reynolds number , newtonian fluid , apparent viscosity , particle size , friction loss , thermodynamics , composite material , chemistry , physics , geology , oceanography
Abstract Experiments have been conducted to assess the effect of particle shape on pipeline friction in turbulent flow, using laboratory pipelines of nominal diameter 50 mm and 150 mm. The experiments were intended to examine the extent to which a fluid model is appropriate for slurries of this type, especially at high solids concentrations. The experiments confirm that fluid friction at low and moderate solids concentrations is proportional to slurry density, with particle shape being of minor importance. At high solids concentrations, additional increases in friction are observed and these depend upon the ratio of the solids concentration to the maximum settled concentration. Although this friction increase is qualitatively similar to that which would result from increased slurry viscosity, the evidence suggests that particle‐wall contact is the mechanism. However, the transition from turbulent to laminar flow indicates that an effective viscosity should be used in calculating critical Reynolds numbers.