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EFFECT OF RADIAL INNER CYLINDER VIBRATION ON TAYLOR-COUETTE FLOW WITH FREE SURFACE

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.450
pages 599-606

Hamid Oualli
Ecole Militaire Polytechnique, Fluid Mechanics Laboratory, BP 17, 16046 Bordj El Bahri, Algiers, Algeria

Mahmoud Mekadem
Ecole Militaire Polytechnique, Fluid Mechanics Laboratory, BP 17, 16046 Bordj El Bahri, Algiers, Algeria

Ali Abdelali
Ecole Militaire Polytechnique, Fluid Mechanics Laboratory, BP 17, 16046 Bordj El Bahri, Algiers, Algeria

Ahcene Bouabdallah
USTHB / Faculty of Physique, LTSE Laboratory, BP 32, Bab Ezzouar, 16111, Algiers, Algeria

Аннотация

The present work deals with a numerical and experimental study of the Taylor-Couette flow controlled using combination of free surface oscillation with the inner cylinder crosssection variation. The numerical results are obtained using FLUENT software package for a 3D unsteady incompressible flow. The basic system geometry has a height H=170mm, a ratio of the inner to the outer cylinders radii η=0.9, an aspect ratio Γ=28.5 and the gap ratio to the inner cylinder radius, δ=0.1, fig. 1. The results show that Taylor and Ekman vortices can be inhibited and/or destroyed in all flow regimes appearing in the Taylor-Couette flow route to turbulence. In addition, the suggested technique yields significant increase in the axial and azimuthal velocity fluctuating field, leading to strongly enhanced flow mixing. It is found that the rms of the velocity fluctuations can increase by a rate as high as 900% for the radial and azimuthal directions and 2500% for the axial direction. This is promising for various industrial processes where mixing enhancement is required.

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