Experiments on densely-loaded non-Newtonian slurries in laminar and turbulent pipe flows: Quarterly technical progress report No. 2. [Silica gel particles suspended in mixtures of: (1) 70. 3% Stoddard solvent and 29. 7% Exxon 150; (2) 55% Stoddard solvent and 45% mineral oil by weight]
An experimental evaluation of the structure of non-Newtonian slurries in laminar, transitional, and turbulent flow regimes in pipes is the primary objective of this research. Experiments are being conducted in a large-scale pipe slurry flow facility with an inside pipe diameter of 51 mm. Detailed flow measurements including turbulence quantities such as Reynolds stress will be taken with a two-component laser-Doppler velocimeter in a transparent test section with a transparent model slurry. Two transparent model slurries have been developed with non-Newtonian rheological properties. Silica gel particles with diameters on the order of one micron were suspended in two different hydrocarbon liquid mixtures with viscosities of 1.19 and 6.39 cS. In rheological measurements with a concentric cylinder viscometer, slurries from both liquid mixtures exhibited slip. From a linear regression analysis with a power-law model, slurries with the higher viscosity fluid had yield values of 80 and 30 dyn/cm/sup 2/ for silica gel concentrations of 5.6 and 4.0% by weight, respectively, and the exponents were 0.584 and 0.763. The measured refractive index for the transparent slurries is 1.454 where the difference in refractive index between the fluid and silica gel is estimated to be less than 0.001. Bench scale tests with large diameter silica gel particles on the order of 100 ..mu..m have produced slurries with excessive turbidity. A silica gel manufactured by a different process which may form a less turbid slurry is currently under investigation. A benchmark pressure-drop experiment was completed in the slurry loop with a glycerine and water mixture. 15 refs., 11 figs., 1 tab.
- Research Organization:
- Southwest Research Inst., San Antonio, TX (USA)
- DOE Contract Number:
- FG22-86PC90962
- OSTI ID:
- 6867099
- Report Number(s):
- DOE/PC/90962-T2; ON: DE87008934
- 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
01 COAL, LIGNITE, AND PEAT
FLUID FLOW
TEST FACILITIES
SLURRIES
RHEOLOGY
BENCH-SCALE EXPERIMENTS
EXPERIMENTAL DATA
LAMINAR FLOW
PARTICLE SIZE
PIPES
REFRACTIVITY
RESEARCH PROGRAMS
SHEAR
SILICA GEL
STRESSES
TURBULENT FLOW
VELOCITY
ADSORBENTS
DATA
DISPERSIONS
INFORMATION
MIXTURES
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SIZE
SUSPENSIONS
420400* - Engineering- Heat Transfer & Fluid Flow
013000 - Coal
Lignite
& Peat- Transport
Handling
& Storage