Rheology of coal slurries. Final report
Experimental investigations of suspensions of three size distributions of glass spheres in a solution of tetralin and tetrabromoethane were made using a Haake viscometer. The values of viscosity were determined over a range of shear rates from 1 to 1000 sec/sup -1/. The suspending medium is Newtonian with a viscosity of about 9.66 centipoise at 25 +- 1/sup 0/C. At phi less than or equal to 20%, the suspension exhibited Newtonian behavior but at phi greater than or equal to 30%, the suspension exhibited pronounced non-Newtonian behavior. Experimental studies of these three size distributions were also conducted in aqueous solutions of polyvinylpyrrolidone using a pipe loop apparatus. Viscosity was measured over the shear rate range from 600 to 6000 sec./sup -1/. These suspensions having non-Newtonian suspending media, exhibit non-Newtonian behavior at all concentration levels of the solid particles. In the limit of very high shear rates, the suspension viscosity was found to be independent of tube diameter over the range of shear rates and concentrations studied. The rheological behavior of slurries of irregularly-shaped anthracite coal particles was also systematically investigated. The suspending medium consisted of a mixture of anthracene oil and tetrabromoethane. The shear rate was varied from 0.01 to 1000 sec./sup -1/. Volume concentrations range from 0 to 34%. At volume concentrations greater than 29% the slurries exhibited a yield stress and pronounced thixotropic behavior. The relative viscosities of both the model and the coal slurries were found to be dependent on both the shear rate and the particle size. In the case of the coal slurries caution must be exercised with regard to the proper interpretation of the rheological data due to the influences of the measured apparent density of the coal particles, viscometric flow geometry, and time dependent effects.
- Research Organization:
- State Univ. of New York, Buffalo (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- AC22-80PC30028
- OSTI ID:
- 6231658
- Report Number(s):
- DOE/PC/30028-T1; ON: DE83009868
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FUEL SLURRIES
RHEOLOGY
VISCOSITY
ANTHRACENE
ANTHRACITE
BROMINATED ALIPHATIC HYDROCARBONS
EXPERIMENTAL DATA
GLASS
MEDIUM TEMPERATURE
MIXTURES
PARTICLE SIZE
PYRROLIDONES
SHEAR
SPHERES
TETRALIN
AMIDES
AROMATICS
AZOLES
BLACK COAL
CARBONACEOUS MATERIALS
COAL
CONDENSED AROMATICS
DATA
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
LACTAMS
MATERIALS
NUMERICAL DATA
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRROLES
SIZE
SLURRIES
SUSPENSIONS
010600* - Coal
Lignite
& Peat- Properties & Composition
013000 - Coal
Lignite
& Peat- Transport
Handling
& Storage