ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
A method is presented for determining the flow-rate - pressure-gradient relationship for the streamline flow of the large class of non-Newtonian, nonthixotropic fluids to which the Powell-Eyring equation applies. The general procedure and assumptions required in developing this method are the same as used in deriving the Hagen-Poiseuille equation except that the Powell-Eyring equation is used in place of Newton's equation to relate shear stress to shear rate.The method can be used to predict pipe-flow pressure gradients from both precision viscometer data and pipe-flow data. Its applicability is demonstrated for three typical non-Newtonian fluids, 3% carboxymethylcellulose in water, 15% napalm in kerosene, and 33% hydrated lime in water.When used with pipe-flow data, it resembles the method of Alves and associates, compensating for the inconvenience of an additional step in calculation procedure by providing a means of extrapolating beyond the range of the experimental data.The relationships developed facilitate the application of shear-stress - shear-rate data in the design of conduits for non-Newtonian fluids.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690010427
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