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

Gravity Effect on Taylor-Dean Flow in Conical System
Y. Hamnoune, F. Yahi, A. Bouabdallah
Abstract:
The Taylor-Dean flow is a combination of two movements: a Taylor-Couette flow [1] and Dean flow [2]. This type of flow is largely studied theoretically and experimentally [3]. This work dealt with an experimental study about the gravity effect on the onset of the Taylor-Dean instabilities. The experimental setup consists of two horizontal coaxial truncated cones. The inner cone is rotated and the outer one is at rest. The cones have the same apex angle, giving a constant radial gap. According to the variation quasi-static of the angular velocity and the aspect ratio is fixed H/d, one observes by visualization techniques of the flow the effects of the variation of the system inclination angle in the range 0 ≤ α ≤ 90°. Therefore, the gravity effect is evaluated on the appearance of Taylor-Dean instabilities in laminar-turbulent transition regime: primary mode and secondary mode. For a given angular rotation speed, one measures the different characteristics of the movement such that the cell number, the wave number and the phase velocity versus the modified Taylor number.
Keywords:
Taylor-Dean flow, gravity effect, primary mode, horizontal coaxial cones

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2019.014

In Proceedings Topical Problems of Fluid Mechanics 2019, Prague, 2019 Edited by David Šimurda and Tomáš Bodnár, pp. 95-100 ISBN 978-80-87012-69-7 (Print) ISSN 2336-5781 (Print)