ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Viscous fluids are frequently agitated by multiple impellers and in vessels only slightly larger than the impeller. This paper presents data for both Newtonian and non-Newtonian fluids agitated under such conditions. The large decreases in power requirements (at a given level of mixing rate in the non-Newtonian system) which are possible by use of low tank diameter, impeller diameter ratios and/or two impellers, have been quantitatively studied.The types of impellers used in the non-Newtonian work and the ranges of conditions over which power requirement correlations were developed are summarized as follows: TextDT/DnNReMarine propeller0.42-1.01.4 -4.80.16-1.00.67-1320Fan turbine0.33-0.671.3 -3.00.21-1.46.6 -160Flat-Bladed turbine: one impeller0.17-0.671.3 -5.50.20-1.52.0 -1800two impellers per shaft0.33-1.001.023-3.50.14-1.000.15-620The results generally confirm an approach developed earlier, for the broader ranges of variables listed above. For the non-Newtonian fluids of primary interest in this study, that is purely viscous materials having flow behavior indexes of less than unity (pseudoplastics, Bingham plastics), the prediction of power requirements has been developed to nearly the same level of perfection as for Newtonian fluids.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690070103
