By Hendrikus Egidius Antonia van den Akker; J J Derksen
Commonly, fluid blending and the similar multiphase contacting tactics have constantly been considered as an empirical know-how. Many elements of combining, dispersing and contacting have been concerning energy draw, yet figuring out of the phenomena used to be constrained or qualitative on the such a lot. specifically over the past decade, in spite of the fact that, plant operation objectives have tightened and product standards became stricter. the general public expertise as to safeguard and environmental hygiene has elevated. The force in the direction of higher levels of sustainability within the method industries has prompt for decrease quantities of solvents and for larger yields and better selectivities in chemical reactors. All this has ended in a
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Extra info for 10th European Conference on Mixing: proceedings of the 10th European conference, Delft, the Netherlands, July 2-5, 2000
92, the wall jet is about to impinge on the top of the tank. 0. The Rei required to attain fully turbulent flow clearly increases with z/T. There is some effect of C/D, but this is difficult to define with the limited data reported here. 92 22 4. CONCLUSIONS The objective of this work was to carefully examine the limits of fully developed turbulence in the bulk of a stirred tank. 5, the upper third of the tank drops into the transitional flow regime at Rex=2xl 04. 667. This result has implications for many industrial applications with surface feed, or with dip pipes in the top third of the tank.
Syrup. Series 136 (1994) 283. 5. W. Nienow, Chem. Eng. , 52 (1997) 2557. 6. H. Fruman, P. Cerrutti, T. Pichon and P. Dupont, J Fluids Engng, 117 (1995), 162. 7. R. J. L. Billet, J Fluids Engng, 113 (1991) 496. 8. K. F. Reeder, A. S. Dickey, Recents Progres en Genie des Procedes, 11 (1997) 115. 9. K. van't Riet, W. Bruijn W. M. Smith, Chem. Eng. , 31 (1976) 407. 10. M. Yianneskis, Z. H. Whitelaw, J. , 175 (1987) 537. 11. M. H. Whitelaw, Trans. E. Part A, 71 (1993) 543. 12. C. Lee and M. E. Journal, 44 (1998) 13.
IMPELLER EFFICIENCY & SCALING One of the most important criteria in impeller selection is the power consumption (energy expenditure) required for a particular mixing performance. Consideration will be restricted here to blending of water-like 'thin' miscible fluids only. 33 [4,27]. This is well established and supported by the findings of most if not all investigators. It has also been reported that at equal D / T and power draw blend or mixing time is only a function of the power input and is independent of impeller type [4,28].
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