By Hendrikus Egidius Antonia van den Akker; J J Derksen
Generally, fluid blending and the comparable multiphase contacting tactics have constantly been considered as an empirical know-how. Many facets of combining, dispersing and contacting have been relating to energy draw, yet realizing of the phenomena was once constrained or qualitative on the such a lot. particularly over the past decade, even though, plant operation objectives have tightened and product standards became stricter. the general public knowledge as to security and environmental hygiene has elevated. The force in the direction of better levels of sustainability within the strategy industries has advised 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
The pitched blade turbine generates one trailing vortex behind each blade. The diameter of the vortex is in maximum about the projected height of the blades. The trailing vortex leaves the impeller region in axial direction and dissipates within two blade heights from the lower tip of the blades. 05T from the lower tip of the blade. 5 times the projected height of the blade. In addition, a smaller tip vortex was obtained at the inner edge of the blade. 2. Vorticity Although the depicted flow fields clearly show the trailing vortices and the vortex centres can be determined accurately due to the high density of the measuring grid, it is more difficult to locate exactly the vortex edges, which are needed to give a full description of the trailing vortices.
Total P const N .... O .... P0 - - - - o .... Total P const P / b l a d e ---O--. kma x constant N .... ~ ... 1 10 N u m b e r of blades Figure I Effect of the number of blades of a disk turbine on P, P0 and turbulence levels in the impeller stream (data from . 25 ----G---- LTF/Vti p 1- ! O........ 25- .... 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.
Fig. 5. Turbulence distribution I 4. Fig. 6. Turbulence distribution II CONCLUDING REMARKS The flow fields, the trailing vortex systems and the turbulence characteristics of three different types of impellers were investigated in detail by means of high resolution LDAmeasurements within and in the vicinity of the impellers. Hydrofoil impellers produce a vortex system which is similar to that of tip wing vortices obtained for airfoils. These vortices 16 contain considerably less turbulence kinetic energy than those generated by Rushton turbines and pitched blade impellers.
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