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Effect of Geometry Design on Mixing Performance of Newtonian Fluids using helical Overlapped Mixer Elements in Kenics Static Mixer
Author(s): Ahmed TALHAOUI, Belkacem Draoui, Abdelkader YOUCEFI
Keywords: Mixing, Laminar Flow, Static mixer, overlapped mixer, Mixing performance,Mixer efficiency
The laminar flow pattern and mixing behavior of incompressible Newtonian fluids in different modified mixer configurations was numerically investigated using computational fluid dynamic(CFD) simulations in the range of Re=0.15-100. The governing equations were solved by ANSYS Fluent 14 using second order finite volume method (FVM) and the SIMPLE algorithm scheme. The numerical model is validated via comparison of predicted numerical pressure drop results to empirical correlations available in literature. The effects of incorporated helical overlapped mixer elements and the diameter aspect ratio (C) on the mixing efficiency for different static mixer geometries were examined and evaluated by characteristics measures of Intensity of Segregation (IOS), pressure drop, extensional efficiency and G-factor. The performance of new modified mixers is compared with the standards Kenics static mixer, All the static mixers with modified internal geometry achieved fast mixing and better mixing quality than Kenics mixers. In addition, an increase in diameter aspect ratio C benefited a decrease in pressure drop within the static mixer. The modified mixer with C=1.5 was found to have highest mixing efficiency in term of short mixing length compared to the others. In contrast, The mixer with C=2 is the most efficient in term of low pressure drop and energy requirement.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.