Title of article :
Experimental Investigations of the Spherical Taylor- Couette Flow
Author/Authors :
Mahloul, M Faculty of Physics - University of Sciences and Technology “Houari Boumedienne”, Algiers, Algeria , Mahamdia, A Faculty of Physics - University of Sciences and Technology “Houari Boumedienne”, Algiers, Algeria , Kristiawan, M INRA, UR Biopolymers Interactions and Assemblies, Nantes, France
Abstract :
Transition to turbulence of a viscous incompressible fluid flow between two concentric spheres with the inner
one rotating and the outer stationary was investigated experimentally. The flow modes were studied using the
flow visualization and electrochemical technique. Different flow states were obtained for the gap/radius ratio
0.107 in function of the Taylor number in the interval (22 - 1500) and aspect ratio (17 - 21). Observed states
were classified into: Taylor Vortex Flow (TVF), Spiral Mode (SM), Spiral Mode Wavy Mode (SM+WM),
Spiral Wavy Mode (SWM), Wavy Mode (WM) and Chaos. The variations of the flow patterns were reflected
by the wall velocity gradient, its fluctuation and spectral analysis. Fast Fourier transform applied on the time
series of the wall velocity gradient allowed for the analysis and identification of the fundamental frequencies
and their evolutions associated with each flow state.
Keywords :
Electrochemical method , Visualization , Instability , Mode , Spherical taylor-couette
Journal title :
Astroparticle Physics
