Experiments on densely-loaded non-Newtonian slurries in laminar and turbulent pipe flows: Quarterly technical progress report No. 5
An experimental description of the flow structure of non-Newtonian slurries in the laminar, transitional, and full turbulent pipe flow regimes is the primary objective of this research. Measurements include rheological characterization of the fluid and local fluid velocity measurements with a laser Doppler velocimeter (LDV). Optical access to the flow is gained through a test section and model slurry which are both transparent. The model slurry is formulated from silica gel particles and hydrocarbon liquid mixture whose indices of refraction are matched so that light is not scattered from the particles. Experiments are being conducted in a large-scale pipe slurry flow facility with an inside pipe diameter of 51 mm (2 inches). Detailed flow measurements including turbulence quantities such as Reynolds stress were measured with a two-component two-color LDV. The present research indicates that non-Newtonian slurries are possible with concentrations of a few percent by weight of small particles whose sizes are one micron or less. A non-Newtonian slurry from small particles could maintain large particles (100 micron size) at high concentrations in suspension almost indefinitely. Such a slurry would prevent particle fallout and its associated problems. Velocity profiles were acquired by the LDV in the laminar, transitional, and turbulent flow regimes. The velocity profile for laminar flow was in agreement with theory. The range of the transition region was 21% of the transition velocity in comparison to 50% for a Newtonian fluid. 22 refs., 26 figs., 2 tabs.
- Research Organization:
- Southwest Research Inst., San Antonio, TX (USA)
- DOE Contract Number:
- FG22-86PC90962
- OSTI ID:
- 5494238
- Report Number(s):
- DOE/PC/90962-T5; ON: DE88006209
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FUEL SLURRIES
HYDRAULIC TRANSPORT
LAMINAR FLOW
PRESSURE DROP
TRANSITION FLOW
TURBULENT FLOW
TEST FACILITIES
FRICTION FACTOR
PIPES
PROGRESS REPORT
RHEOLOGY
SIZE
SLIP FLOW
VELOCIMETERS
VELOCITY
DISPERSIONS
DOCUMENT TYPES
FLUID FLOW
FUELS
GAS FLOW
MEASURING INSTRUMENTS
MIXTURES
SLURRIES
SUSPENSIONS
TRANSPORT
013000* - Coal
Lignite
& Peat- Transport
Handling
& Storage