Viscosity of coal/water slurries at high shear rates

Technical Report · Mon Aug 01 04:00:00 EDT 1988

OSTI ID:6791762

Sekar, R R; Wang, C S; Choi, U S

The service life of an injector nozzle in a diesel engine fueled with of coal/water slurry (CWS) is 2-5 h, which limits the continuous running time of the engine. This study of CWS flow and erosion in injector nozzles was initiated to provide an analytical tool, validated by experiment, for designing a durable injector and predicting long-term wear from limited test runs. The two-phase hydrodynamic theory of solid/liquid slurry flow has been extended to incorporate the constitutive relationship for power-law non-Newtonian behavior. A computer model has been developed to predict the spatial and temporal variations in solid and liquid velocities, viscosities, and concentrations under the high shear rates encountered in diesel injection systems. The model has been validated using Newtonian, single phase flow data obtained with water or No. 2 diesel fuel and non-Newtonian, two-phase flow data using a CWS. The computed and measured viscosities and shear rates showed good agreement. Viscosities of four micronized CWS samples were measured at shear rates between 3000 and 30,000 sec/sup /minus/1/ in a high-pressure/high-shear capillary tube system of a rotational viscometer. The complex CWS flow at high shear depended on coal particle size, temperature, coal loading, additives, and the shear rate. 40 refs., 19 figs., 6 tabs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6791762
• Report Number(s): ANL/CNSV-66; ON: DE89001032
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
33 ADVANCED PROPULSION SYSTEMS
330102 -- Internal Combustion Engines-- Diesel
CARBONACEOUS MATERIALS
COAL
DIESEL ENGINES
DISPERSIONS
ENERGY SOURCES
ENGINES
FLOW RATE
FLUID MECHANICS
FOSSIL FUELS
FUEL SLURRIES
FUELS
HEAT ENGINES
HYDRODYNAMICS
HYDROGEN COMPOUNDS
INTERNAL COMBUSTION ENGINES
MATERIALS
MATHEMATICAL MODELS
MECHANICS
MIXTURES
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
PARTICLE SIZE
RHEOLOGY
SHEAR
SIZE
SLURRIES
SUSPENSIONS
VISCOSITY
WATER