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A NUMERICAL STUDY OF HEAT CONVECTION IN A THERMAL CHAOTIC MIXER WITH TWO RODS

DOI: 10.1615/ICHMT.2008.CHT.1320
14 pages

Kamal El Omari
Laboratoire des sciences de l’ingénieur Appliquées a la Mécanique et au génie Electrique (SIAME), Université de Pau et des Pays de l’Adour (UPPA), IFR, rue Jules Ferry, BP 7511, 64075 Pau Cedex, France

Yves Le Guer
Laboratoire des sciences de l’ingénieur Appliquées a la Mécanique et au génie Electrique (SIAME), Université de Pau et des Pays de l’Adour (UPPA), IFR, rue Jules Ferry, BP 7511, 64075 Pau Cedex, France

Abstrakt

In this paper, a numerical study of a chaotic mixing process that involves a highly viscous fluid is presented. The investigated mixer is composed of two circular rods maintained vertically inside a cylindrical tank. The tank and the rods are heated and can rotate around their revolution axis. Chaotic flows are obtained by imposing a temporal modulation of the rotational velocity. Unsteady equations for the conservation of momentum and energy are solved by using a pressure-based code. This code has a finite volume formulation applied to unstructured hybrid grids. The efficiency of the mixer is analyzed by focusing on the quantity of thermal energy supplied to the fluid and on the quality of the temperature homogenization. The influence of different parameters is analyzed: the type of modulation, the range of its period, the direction of rotations and the rods' eccentricity.

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