Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Concentration and Gravity Effect on the Taylor - Dean Flow Between Two Horizontal Rotating Coaxial Cones
Y. Hamnoune, F.Yahi, A. Bouabdallah
Abstract:
This work dealt with an experimental study about the gravity and concentration effect on the onset of the Taylor-Dean instabilities. The experimental set up consists of two horizontal coaxial truncated cones, the inner cone is rotating and the outer one is at rest. The cones have the same apex angle in such a way we proceed with a constant radial gap of the flow according to quasi-static increasing of the angular rotation speed rate. Under these conditions, one observes by visualization techniques of the flow, the inclination effect of the flow system in the range 0 ? ? ?90°. While the, aspect ratio H/d is fixed. Therefore, the gravity and concentration effect is evaluated on the appearance of Taylor-Dean instabilities in the laminar-turbulent transition. For a given angular rotation speed, one measures the different movement characteristic, such that the cells number, the wave number and the phase velocity versus modified Taylor number.
Keywords:
Taylor-Dean instability, gravity and concentration effect, rotating coaxial cones

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2018.017

In Proceedings Topical Problems of Fluid Mechanics 2018, Prague, 2018 Edited by David Šimurda and Tomáš Bodnár, pp. 131-136 ISBN 978-80-87012-65-9 (Print) ISSN 2336-5781 (Print)