Abstract
Since many years static mixers find usage in chemical, food, cosmetic and pharmaceutical industry. One of the most commonly used is the Kenics type static mixer. In a framework of the current work the CFD simulation for Kenics static mixer were performed. In food or cosmetic industry one must deal very often with non-Newtonian fluids. Therefore this work concerns the numerical study of non-Newtonian fluid flux in a kenics km static mixer with laminar flow using the Navier-Stocks equation governing the phenomenon and the pressure loss equation. This simulation was made using the computational fluid dynamic software (CFX 12.0). In this paper we studied the influence of the Reynolds number, the viscosity of the fluid, aspect ratio and the number of helical elements fixed on the pressure drop. It was found that the CFD results of pressure drop for non-Newtonian power law was similar to literature data (the correlation of C.D.GRACE 1971 and the numerical simulation of E.SAATDJIAN 2012).
Highlights
The static mixers (KENICS series) are used in the chemical, pharmaceutical and food industry
After the validation our some predicted results, we studied the influence of several parameters on the flow structure and the pressure drop ΔP in this type of static mixer, namely: Reynolds number, fluid viscosity, aspect ratio P* and the number of fixed helical elements)
The study of viscous Newtonian fluids through a Kenics static mixer was performed via numerical simulation
Summary
The static mixers (KENICS series) are used in the chemical, pharmaceutical and food industry They contain helical elements that allow all mixing applications (turbulent, laminar, liquid-liquid dispersion, gas-liquid dispersion, extrusion, etc.), and characterized by the (lengthdiameter) ratio. Meng et al [12] simulated numerically the chaotic laminar flow in a modified Kenics mixer and they explored the effect of the aspect ratio, Reynolds number as well as the perforations design (diameter and spacing) on the friction coefficients, shear rates and the stretching rates. Mahammedi et al [13] investigated numerically the performance of Kenics static mixer for stirring shear-thinning fluids They focused on the effect of Reynolds number, fluid properties, twist angle and blade pitch on the hydrodynamics and pressure drop. We investigate the effect of Reynolds number, fluid viscosity, aspect ratio P* and the number of mixing elements on the flow patterns and pressure drop
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