Axial Flow Effect on the Stability of Circular Couette Flow

Document Type : Regular Article

Authors

1 Laboratory of Modelisation and SImulation in Fluid Mechanics (LAMOSI), University of Sciences and Technology of Oran, USTO-MB, 31000, Oran, Algeria

2 LaSIE, UMR 7356, University of La Rochelle, La Rochelle, France

3 Laboratory of Fluid Mechanics, Ecole Militaire Polytechnique (EMP), Borj El Bahri, 16111 Algiers, Algeria

4 Laboratory of Thermodynamic and Energetical Systems (LTSE), USTHB, Bab Ezzouar, 16032 Algiers, Algeria

Abstract

We investigate the effect of an axial Poiseuille annular flow on the stability of Taylor vortices via numerical simulation using CFD Ansys Fluent software. The working conditions are identical to those of the Taylor-Couette experimental device of the LaSIE laboratory, where the inner cylinder is rotated. An incompressible fluid of density ρ= 998 kg/m3, with a kinematic viscosity m2/s at a temperature T= 19.5 °C is considered. The geometrical parameters of the flow system are characterized by a height H=275 mm, a radius ratio η=0.804, and an axial aspect factor Γ=45.45. The axial Reynolds number and Taylor number are respectively in the ranges of  , and . Flow control is carried out according to two distinct protocols to bring out the effect of axial flow on the evolution of the Taylor vortex Flow (TVF). The first consists of superimposing an azimuthal flow around the critical TVF threshold with increasing axial flow until the Taylor vortices disappear. In the second, an axial field is set and the Taylor number is varied until onset of the TVF mode. It is predicted that in the presence of an axial flow, the critical threshold for first instability triggering (TVF) is delayed. In addition, the ratio of the axial phase velocity to the mean axial velocity of the axial base flow is 1.16. This value agrees well with previous results reported in literature.

Keywords

References

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Journal of Applied Fluid Mechanics
Volume 15, Issue 1 - Serial Number 63
January and February 2022
Pages 271-281

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History

  • Received: 17 June 2021
  • Revised: 05 September 2021
  • Accepted: 11 September 2021
  • Available online: 19 November 2021

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