Abstract

The present study presents a numerical simulation of the hydrodynamic behavior inside a scraped surface heat exchanger (SSHE) which includes Archimedes’ screw instead of using scrapers. A 3D CFD code is used in order to characterize the flow pattern and the apparent viscosity distribution in the heat exchanger for Bingham fluids. With that purpose, the resolution of the conservation equations of continuity and momentum equations are conducted using the finite volume method. The effect of dimensionless numbers (rotational Reynolds and axial Reynolds) on the hydrodynamic behavior is studied. Numerical investigation shows that the lowest apparent viscosity values are localized close to the stator wall and near the rotor of the exchanger and the highest values are next to the Archimedes’ screw. Studies indicate also that the strongest shear rates values are in the space between the tip of the Archimedes’ screw and the stator wall.

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