MEASUREMENT OF THE TURBULENT VELOCITY PROFILE OF THORIA SUSPENSIONS IN PIPE FLOW
Technical Report
·
OSTI ID:4161916
Inter-particle forces present in thoria suspensions, which cause a shear dependent (non-Newtonian) viscosity, were found to affect the turbulent behavior of such a suspension in pipe flow as measured by a decrease in Fanning friction factor below that predicted for a Newtonian fluid. Turbulent velocity profiles of two concentrations of a shear-thinning aqueous suspension of thoria in a 1.60 in. brass pipe test section were obtained by means of Pitot tube traverses. Friction pressure drops across the test section were measured using static pressure taps. The test section was mounted in a circulating slurry loop, which had a maximum flow rate of 85 gpm. A vertical capillary tube viscometer was used to obtain laminar shear diagrams of the suspension from which to calculate the appropriate viscosity to use in correlation. The resulting velocity profiles and friction factor-Reynolds number plots for the dilute suspension were found to show no turbulence effects. However, the concentrated suspension friction factors were lower and the velocity profiles steeper than predicted from Newtonian fluid correlations. In addition the effective laminar sublayer thickness for the concentrated suspension was greater than Newtonian. The high concentration suspension profiles coincide with those obtalned for several widely differing non-Newtonian fluids (including a visco-elastic fluid) whose friction factors also fall the sanne distance below the Newtonian smooth tube line. A generalized method of predicting the friction factor plot from the u/sup +/ - y/ sup +/ plot for shear thinning non-Newtonian is presented. (P.C.H.)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-18-000402
- OSTI ID:
- 4161916
- Report Number(s):
- ORNL-TM-701
- Country of Publication:
- United States
- Language:
- English
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