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Continuous and oscillatory flow properties of concentrated coal/water suspensions
Author(s) -
Lapasin Romano,
Pricl Sabrina
Publication year - 1992
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.5450700104
Subject(s) - limiting , viscoelasticity , coal , flow (mathematics) , shear (geology) , mechanics , water flow , particle (ecology) , shear stress , shear flow , volumetric flow rate , materials science , shear rate , thermodynamics , geotechnical engineering , chemistry , rheology , geology , composite material , physics , engineering , mechanical engineering , oceanography , organic chemistry
A Theological characterization of coal/water suspensions has been carried out under continuous and oscillatory flow conditions. Shear stress ‐ shear rate data were correlated with the Shangraw‐Grim‐Mattocks (SGM) equation. The analysis of the SGM parameters indicated that a limiting concentration ϕ 0 exists above which the suspensions exhibit plastic behavior and suggested that a strong particle aggregation still occurs at high rates of shear. Oscillatory flow tests revealed marked non‐linear viscoelastic properties and analogies were found between the continuous and oscillatory flow behaviors of the coal/water suspensions, particularly under limiting flow conditions.