Polydisperse coal slurry rheology. Quarterly report

Technical Report · Mon Jul 01 04:00:00 EDT 1985

OSTI ID:5464868

Probstein, R F

The objective of the program is to develop a theory to predict the rheological characteristics (viscosity) of highly loaded, stabilized coal-water slurries over a wide range of shear rates from those typical for pumping (100 sec/sup -1/) to those typical of atomization (20,000 sec/sup -1/) in order to enable the optimum design of systems employing such slurries as alternate fuels. The scope of work is to perform an analysis in which a stabilized polydisperse pulverized coal slurry is modeled as made up of two relatively distinct particle fractions - a coarse fraction and a smaller fine fraction. Accomplishments to date are: Relative bimodal character of dense coal-water slurries is borne out. Simplified purely bimodal model shows that the particle sizes separating coarse and fine volume fractions in six different slurries are between 2 and 8 microns, even though the particle diameters in the slurries range from 0.5 to 300 microns. Large particles govern level of slurry viscosity at low shear rates. If the maximum packing fraction is modified to account for a continuous particle size distribution, indications are that the separating diameter range is likely to be narrower. 4 refs., 2 figs., 2 tabs.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• DOE Contract Number: FG22-84PC70061
• OSTI ID: 5464868
• Report Number(s): DOE/PC/70061-4; ON: DE85014422
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
013000 -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
COAL FINES
DISPERSIONS
DISTRIBUTION
EQUATIONS
FUEL SLURRIES
FUELS
HYDROGEN COMPOUNDS
MIXTURES
OXYGEN COMPOUNDS
PARTICLE SIZE
RESEARCH PROGRAMS
RHEOLOGY
SHEAR
SIZE
SLURRIES
SUSPENSIONS
VISCOSITY
WATER