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- Title
Some Characteristics of Stirred Vessel Flows of Dilute Polymer Solutions Powered by a Hyperboloid Impeller.
- Authors
Cavadas, A. S.; Pinho, F. T.
- Abstract
Measurements of the power consumption and mean and turbulent velocities in the wall jet of a stirred vessel flow, powered by a hyperboloid impeller, were carried out. The fluids were aqueous solutions of tylose, CMC and xanthan gum (XG), at weight concentrations ranging from 0.1% to 0.6%, which exhibited varying degrees of shear-thinning and viscoelasticity. The hyperboloid impeller parameter k of Metzner and Otto (1957) was found to be equal to 27.2 ±4. In the Reynolds number range of 10⊃3 to 3 x 104 the mixing power was reduced for all non-Newtonian fluids, but never by more than 13%. The flows of the 0.2% CMC and 0.2% XG solutions were found to be less turbulent than those of water, especially for the latter fluid where a reduction in axial rms in excess of 50% was found in the wall jet. This was attributed to elasticity effects and especially to the high zero shear viscosity, of the latter fluid.
- Subjects
WALL jets; IMPELLERS; TURBOMACHINES; FLUID dynamics; TURBULENCE
- Publication
Canadian Journal of Chemical Engineering, 2004, Vol 82, Issue 2, p289
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.5450820210