Advanced study in solid transport: Rheological behavior of dense suspension

Technical Report · Tue Oct 23 04:00:00 EDT 1990

OSTI ID:5992648

Kim, H J; Chen, J L.S. ^[1]; Roidt, R M; Burgman, H A ^[2]

---

1. Pittsburgh Univ., PA (USA). Dept. of Mechanical Engineering
2. Westinghouse Electric Corp., Pittsburgh, PA (USA). Science and Technology Center

The objective of the present research is to develop a basic understanding of the fundamental rheological properties of high solids concentration slurries or wet cake. A dynamic shear cell test device has been constructed and operated to measure dynamic shear stress and determine the effects of experimental parameters upon the dynamic shear stress of the materials. The solids used are glass beads and coal powders. The experimental parameters investigated are: water fraction, normal stress, speed, gap height, size, and size distribution. A statistical method is adapted to evaluate the effects of the experimental parameters. The experiments with glass beads show that the dynamic shear stress is independent of shear rate, providing the gap height is larger than about 27 times the bead diameter, but is a functional of normal stress and water fraction. The dynamic friction coefficient increases sharply as the water fraction increases up to 10%, and decreases gradually for water fractions greater than 10%. Dynamic experiments with coal-water mixtures show that the coal-water mixtures behave like the glass beads when water fraction is lower than a certain value. However, as the water fraction increases beyond that value, the coal-water mixtures display the characteristics of thixotropic fluids with shear thinning. The flow index of the coal-water mixtures is independent of normal stress, but decreases as the water fraction decreases. 66 figs., 15 tabs.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (USA). Science and Technology Center
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC22-88PC88949
• OSTI ID: 5992648
• Report Number(s): DOE/PC/88949-T8; ON: DE91009428
• 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
CARBONACEOUS MATERIALS
COAL
DATA ANALYSIS
DIMENSIONS
DISPERSIONS
DISTRIBUTION
DOCUMENT TYPES
DOPPLER EFFECT
ENERGY SOURCES
FLOW RATE
FOSSIL FUELS
FRICTION FACTOR
FUEL SLURRIES
FUELS
GLASS
HEIGHT
HYDRAULIC TRANSPORT
HYDROGEN COMPOUNDS
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
MIXTURES
OXYGEN COMPOUNDS
PARTICLE SIZE
PROGRESS REPORT
QUANTITY RATIO
RHEOLOGY
SHEAR
SIZE
SLURRIES
STRESSES
SUSPENSIONS
TEST FACILITIES
THIXOTROPY
TRANSPORT
VELOCIMETERS
WATER