By Hendrikus Egidius Antonia van den Akker; J J Derksen
Generally, fluid blending and the comparable multiphase contacting tactics have continuously been considered as an empirical know-how. Many elements of combining, dispersing and contacting have been relating to strength draw, yet knowing of the phenomena was once restricted or qualitative on the such a lot. specifically over the past decade, despite the fact that, plant operation goals have tightened and product requisites became stricter. the general public know-how as to protection and environmental hygiene has elevated. The force in the direction of better levels of sustainability within the method industries has suggested for reduce quantities of solvents and for greater yields and better selectivities in chemical reactors. All this has led to a
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Additional resources for 10th European Conference on Mixing: proceedings of the 10th European conference, Delft, the Netherlands, July 2-5, 2000
75, Part A, pp. 729 - 736. 7. , W~ichter, P. , 1998, Trailing Vortices around a 45 ~ Pitched-Blade Impeller, AIChE-Journal, Vol. 44, No. 6, pp. 1233-1246. A. van den Akker and s Derksen (editors) 9 2000 Elsevier Science B. V. All rights reserved 17 Limits of Fully T u r b u l e n t Flow in a Stirred T a n k Kevin J. Bittorf and Suzarme M. Kresta Department of Chemical and Materials Engineering, University of Alberta Edmonton, Alberta Canada, T6G 2G6 In a stirred tank, the flow has been considered fully turbulent for all Reynolds numbers greater than 2• 104.
A. ,I. Derksen (editors) 9 2000 Elsevier Science B. K All rights reserved Trailing vortex, mean flow and turbulence modification through impeller blade design in stirred reactors M. K. The effect of the trailing vortices produced around impeller blades on the turbulence, pumping, mixing and power characteristics of stirred vessels is considered. It is suggested that the relation of impeller design and such parameters is more complex than generally thought and its assessment is complicated further by the different methodologies employed for impeller and mixing characterisation.
5 r/R Fl, Flc [-] Figure 3 Po versus F1 (0) and Flc (o) for impellers. 5 30 Figure 4 Variation of F1 with r / R in the i m p e l l e r s t r e a m of a Rushton turbine. Data from . A. ,]. Derksen (editors) 9 2000 Elsevier Science B. V. All rights reserved Turbulence generation by different types of impellers M. Sch~ifer, J. Yu, B. Genenger and F. de The turbulence generation by three different types of impellers, (1) a Rushton turbine, (2) a 4/45 ~ pitched blade impeller and (3) a hydrofoil impeller, was investigated by using a refractive index matched, automated LDA-technique.