(Roles of additives and surface control in slurry atomization)

Technical Report · Wed Jan 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/7205199· OSTI ID:7205199

Our experimental results clearly demonstrate that the shape of particles with aspect ratio close to unity dictates the relative suspension viscosity. Suspensions of irregularly shaped particles have higher relative viscosities than suspensions of spherical particles at same volume fractions, in agreement with the reported results at high shear conditions. The relative viscosity of a Newtonian suspension is in excellent agreement with that predicted by the Krieger/Dougherty rigid sphere model using the maximum packing fraction determined from sedimentation as the sole parameter. The relative viscosity of a pseudoplastic suspension is independent of the particle density. It correlates well with the particle Peclet number. The extent of particle diffusion at high shear rates decreases considerably as the particle size increases, and less energy is dissipated as a result. The interparticle electrostatic repulsion plays no significant role in the rheology of pseudoplastic nonaqueous and aqueous glycerol suspensions of noncolloidal particles.

• Research Organization: California State Univ., Long Beach, CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-88PC88912
• OSTI ID: 7205199
• Report Number(s): DOE/PC/88912-T16; ON: DE92017308
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
FUEL SLURRIES
ATOMIZATION
SUSPENSIONS
VISCOSITY
ADDITIVES
BITUMINOUS COAL
MATHEMATICAL MODELS
PARTICLE SIZE
PROGRESS REPORT
SHEAR
SURFACE PROPERTIES
BLACK COAL
CARBONACEOUS MATERIALS
COAL
DISPERSIONS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
MIXTURES
SIZE
SLURRIES
014000* - Coal
Lignite
& Peat- Combustion