Viscosity of suspensions of coal in mineral oil

Moreland, C.

doi:10.1002/cjce.5450410110

Cited by 26 publications

(7 citation statements)

References 10 publications

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“…The influence of the particles shape on the bulk viscosity has been studied for low Re number suspensions. [30][31][32] These studies showed that the more the shape of the particle deviated from that of a sphere, the greater was the bulk viscosity. Moreover, aspherical particles demonstrate increased ordering near the walls (an effect which is more pronounced for the smooth walls).…”

Section: -7mentioning

confidence: 99%

Rheological measurements of large particles in high shear rate flows

et al. 2012

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How to impose stick boundary conditions in coarse-grained hydrodynamics of Brownian colloids and semiflexible fiber rheology J. Chem. Phys. 136, 064901 (2012) This paper presents experimental measurements of the rheological behavior of liquid-solid mixtures at moderate Stokes and Reynolds numbers. The experiments were performed in a coaxial rheometer that was designed to minimize the effects of secondary flows. By changing the shear rate, particle size, and liquid viscosity, the Reynolds numbers based on shear rate and particle diameter ranged from 20 to 800 (Stokes numbers from 3 to 90), which is higher than examined in earlier rheometric studies. Prior studies have suggested that as the shear rate is increased, particleparticle collisions also increase resulting in a shear stress that depends non-linearly on the shear rate. However, over the range of conditions that were examined in this study, the shear stress showed a linear dependence on the shear rate. Hence, the effective relative viscosity is independent of the Reynolds and Stokes numbers and a nonlinear function of the solid fraction. The present work also includes a series of roughwall experiments that show the relative effective viscosity is also independent of the shear rate and larger than in the smooth wall experiments. In addition, measurements were made of the near-wall particle velocities, which demonstrate the presence of slip at the wall for the smooth-walled experiments. The depletion layer thickness, a region next to the walls where the solid fraction decreases, was calculated based on these measurements. The relative effective viscosities in the current work are larger than found in low-Reynolds number suspension studies but are comparable with a few granular suspension studies from which the relative effective viscosities can be inferred.

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Section: -7mentioning

confidence: 99%

Rheological measurements of large particles in high shear rate flows

et al. 2012

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“…Moreland [2] studied the viscosity of suspensions of low volatile bituminous coal in mineral oil. For a solid volume fraction below 0.30, the results were well represented by the Einstein equation for reduced viscosity, whereas at higher concentrations the slurries were non-Newtonian and no satisfactory correlation was found.…”

Section: Introductionmentioning

confidence: 99%

Rheological study of black coal-oil suspensions

Ghosh¹,

Bhattacharya²

1984

Rheol Acta

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The rheological study of coal-oil suspensions is very important because of their application in many industries as alternative fuels to petroleum oil. In this work, the flow behaviour of black coal-oil suspension was studied for a range of coal volume fractions from 0.0378 to 0.427. Shear stresses were measured for shear rates up to 200 s -1 using a Weissenberg Rheogoniometer. All the suspensions behaved like non-Newtonian liquids and exhibited significant increases in apparent viscosity on storage. The flow behaviour of both freshly prepared and aged suspensions was able to be described by power-law models. A model similar to that given by Chong was used to establish relation between the relative apparent viscosity and coal volume fraction for freshly prepared as well as all aged suspensions. A correlation was also established between ageing time and maximum coal volume fraction.

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“…Where oil is available near the coal mines, economic advantages are possible because the oil can serve the dual purpose of both fuel and transport medium. Burners using 60 weight % of coal in oil have been developed for blast furnaces (30).…”

Section: By Pipe Linementioning

confidence: 99%

“…In the thirties, several more systems were installed, including a l/i million ton-per-year line to carry rock salt in saturated solution. By 1959, 20 or more pipe lines were carrying 30 million long tons annually of mixtures of phosphate rock, sand, and clay.…”

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confidence: 99%