Rheology studies of coal/oil slurries related to spray formation and slurry stability. Final report

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5315758

Carmi, S; Kline, K A

Samples of stable coal-oil slurries have been prepared with coal concentrations ranging from 30% to 50% by weight. Extensive rheological data were obtained using capillary and cone and plate viscometers for all five samples of the coal-oil slurry and No. 6 fuel oil which served as a reference fluid. The temperature range was 130/sup 0/F to 180/sup 0/F and we covered a wide range of shear rates 2 to 2500 sec/sup -1/. Viscosity measurements show coal-oil slurries to be shear thinning suspensions, i.e., the viscosity decreases moderately with increasing shear rates. In the concentration range of 30% to 40% coal, the slurry shows a predominantly Newtonian behavior. For slurries with concentrations higher than 40% coal we observe a yield point ranging from 5 to 20 dyne/cm/sup 2/ depending upon the sample and test conditions. Shear thinning effects also start to be evident. In addition, rheological properties were studied using a rotating rod viscometer. The study of these samples of coal-oil slurries with the rotating rod viscometer indicates migration of coal particles away from the rotating rod with no noticeable rod climbing, thus no evidence of normal stress effects.

• Research Organization: Wayne State Univ., Detroit, MI (USA). Dept. of Mechanical Engineering
• DOE Contract Number: FG22-77ET10658
• OSTI ID: 5315758
• Report Number(s): DOE/ET/10658-T1; ON: DE82009281
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
014000 -- Coal
Lignite
& Peat-- Combustion
02 PETROLEUM
025000 -- Petroleum-- Combustion
ATOMIZATION
CARBONACEOUS MATERIALS
COAL
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUEL OILS
FUEL SLURRIES
FUELS
LIQUID FUELS
MATERIALS
MEASURING INSTRUMENTS
MECHANICAL PROPERTIES
MIXTURES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
RHEOLOGY
SHEAR PROPERTIES
SLURRIES
STABILITY
SUSPENSIONS
VISCOSIMETERS
VISCOSITY