By Hendrikus Egidius Antonia van den Akker; J J Derksen
Routinely, fluid blending and the comparable multiphase contacting methods have continually been considered as an empirical expertise. Many points 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. particularly over the last decade, besides the fact that, plant operation objectives have tightened and product standards became stricter. the general public information as to security and environmental hygiene has elevated. The force in the direction of better levels of sustainability within the procedure industries has prompt for decrease quantities of solvents and for larger 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
D 2 Re I = ~ (2) V The flow is considered fully turbulent in the impeller region of a stirred tank when the power number, [Po=P/(pN3DS)] becomes constant with increasing Rei (Rushton, et al. 1950). This is analogous to pipe flow, in which fully developed turbulent flow occurs when the friction factor becomes constant with increasing Re. For an impeller it is generally accepted that fully developed turbulence exists for all Rei > 2x 104. , 1950). The power number and friction factor are used to define the onset of fully turbulent flow for their respective systems; however, the onset of fully turbulent flow can be more accurately determined using dimensionless velocity profiles.
I I I HFI PBT RT .... 9.... kav .... /~.... FI ! _a Impeller type Figure 2 F1, LTF, kay and kav/Vtip 2 for a Scaba 3HSP1 (HFI), a pitched-blade and a Rushton turbine. Data from [251. 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.
The detailed information on the path of the trailing vortices given in this paper is therefore valuable for locating such insertion points. The turbulence distribution has an impact on the mixing performance of impellers. In a future communication the results will be further evaluated and combined with integral measurements such as power-number and mixing time to lead to a better understanding of how the turbulence distribution around the impeller affects the mixing efficiency in stirred tanks.
10th European Conference on Mixing: proceedings of the 10th European conference, Delft, the Netherlands, July 2-5, 2000 by Hendrikus Egidius Antonia van den Akker; J J Derksen