Variety of flow regimes in Taylor-Couette-Poiseuille flow

Magdalena Kristiawan (1) , A. El Faye (2) , M. Mahloul (3) , A. Mahamdia (3) , V. Sobolik (2)

1 BIA - Unité de recherche sur les Biopolymères, Interactions Assemblages
2 LaSIE - Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356
3 Faculty of Physics

Taylor-Couette-Poiseuille (TCP) flow was studied in a wide range of Taylor numbers and low axial Reynolds numbers. The experimental set-up was characterized by a radius ratio of 0.8 and an aspect ratio of 44. The electrodiffusion method with a three-segment probe and an array of simple probes was used for mapping the components of wall shear rate at the outer fixed cylinder. The filling experiments were carried out consisting in adjusting the rotation rate of the inner cylinder and than filling the annular gap with liquid at the prescribed flow rate. Flow patterns were registered using a movie camera. Taylor vortex flow, wavy vortex flow, helical flow having screw opposite to the basic Couette Poiseuille (CT) flow and moving in the direction of the Poiseuille flow, steady and moving helical flow having screw coinciding with the basic CP flow and wavy helical flow was observed at low Taylor numbers. Laminar wavy vortex flow with 2, 3 and 4 waves was observed at moderate Taylor numbers. Vortices with turbulent flow either with straight or wavy boundaries and turbulent helical flow with screw coinciding with the basic flow and axial movement opposite to the axial basic flow were observed at higher Taylor numbers. Different time histories of axial and azimuthal wall shear rate components correspond to each flow pattern. The axial and azimuthal celerity of flow patterns and their size were evaluated from limiting diffusion currents and movies.

Mots clés: wall shear rate; Taylor numbers; three-segment probe; Taylor-Couette-Poiseuille flow; electrodiffusion method

Domaines: Mécanique des fluides [physics.class-ph]

Magdalena Kristiawan, A. El Faye, M. Mahloul, A. Mahamdia, V. Sobolik. Variety of flow regimes in Taylor-Couette-Poiseuille flow. 18. International Couette-Taylor Workshop - ICTW 2013, Jun 2013, Enschede, Netherlands. ⟨hal-01143526⟩