By Hendrikus Egidius Antonia van den Akker; J J Derksen
Usually, fluid blending and the comparable multiphase contacting techniques have regularly been considered as an empirical know-how. Many elements of combining, dispersing and contacting have been with regards to energy draw, yet realizing of the phenomena was once constrained or qualitative on the so much. particularly over the last decade, even if, plant operation pursuits have tightened and product requirements became stricter. the general public know-how as to defense 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 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
71. In this case, 2 traverses must be discarded, and similarity is obeyed for Rei>3xl 04, as shown in Figure 4b. 83, as shown in Figures 5a and b. 6xl 04. 71, the same range identified as the limit of the active zone for mean circulation (Bittorf and Kresta, 1999). This analysis was repeated for several other geometries with similar results. Table 2 gives the limiting z/T as a function of Re~ for both clearances and all 7 runs (runs for the D=T/2 PBT, the A310 and the HE3 (Bittorf, 2000)). 92, the wall jet is about to impinge on the top of the tank.
1. Criteria for Assessing Fully Developed Turbulence Figure 2 shows the dimensionless similarity profile for the three-dimensional wail jet in a stirred tank. In this figure, the x-axis is the dimensionless distance from the wall (rl=y/bl/2) and the y-axis is the axial velocity made dimensionless with the local maximum velocity in the wall jet (u/urn). The classical exponential profile (Glauert 1956) could not be used here because the velocity in this wall jet passes through zero, whereas the classical profile, developed for a stagnant surrounding fluid, asymptotically approaches zero.
18. J. C. R. Paul and M. Yianneskis, Trans. I. Chem. , (1999). 19. W. W. Nienow, S. Chatwin and M. Cooke, Chem. Eng. , 42 (1987) 317. 20. K. S. C. Lee & M. Yianneskis, Trans. , 74 (1996) 369. 21. -M. -S. Yang, Can. J. Chem. Engng. 76 (1998) 556. 22. B. S. S. Brodkey, Chem. Eng. Sci, 35 (1980) 1369. 23. P. Plion, J. P. Couderc, 5th Europ. Conf. Mixing, Wurzburg, (1985) 341. 24. V. P. S. B. B. Joshi, Ind. Eng. Chem. , 31 (1992) 2370. 25. P. Tiljander, B. R6nmnmark & H. Theliander, Can. J. Chem. Engng.
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