By Hendrikus Egidius Antonia van den Akker; J J Derksen
Normally, fluid blending and the similar multiphase contacting methods have consistently been considered as an empirical expertise. Many features of combining, dispersing and contacting have been concerning strength draw, yet knowing of the phenomena was once constrained or qualitative on the so much. specifically over the last decade, besides the fact that, plant operation objectives have tightened and product requirements became stricter. the general public know-how as to safeguard and environmental hygiene has elevated. The force in the direction of higher levels of sustainability within the technique industries has recommended 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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Extra info for 10th European Conference on Mixing: proceedings of the 10th European conference, Delft, the Netherlands, July 2-5, 2000
028 for the HI. For the HI a clear second peak of less intensity is evident at the inner edge of the blade. The two peaks are associated with the presence of two vortices, which are comparable to the typical tip-wing vortices of airfoils. These tip-wing vortices of the HI do not produce that much turbulence as the vortex systems generated by PBTs and RTs. In addition, it is interesting to note that the discharge flow of the RT has high values of turbulence kinetic energy over the entire discharge profile, whereas the HI has very low turbulence values between the two peaks.
Therefore, angleresolved LDV measurements are required in which the flow information is assigned to the 11 Fig. 1. Vessel configuration Fig. 2. Geometry of Impellers corresponding angle of the impeller. For this purpose an optical shaft encoder was used providing 1,000 pulses and a marker pulse per revolution. The marker pulse corresponded to the angle ~ = 0 ~ of an impeller blade and was set at the middle of a blade at the radial tip. m. 32 m/s) for the hydrofoil impeller corresponding to a Reynoldsnumber of Re = ND2/v = 7,300 and Re = 13,523, respectively.
INTRODUCTION The various aspects of micro- and macromixing have been addressed by a wealth of scientists. The first suggestion for a differentiation between mixing on the macro- and the microscale came from Danckwerts . He introduced the scale of segregation as a measure of the size of the regions of non-homogeneity. The quality of the non-homogeneity between the regions can be described by the intensity of segregation Is(t) - cr 2 ( t ) , (1) O''0 which is defined as the mean square deviation of the composition from the mean for a given time t compared to the one for t = 0.