Skip to Main content Skip to Navigation
New interface
Journal articles

Transitional flow of a yield stress fluid in a pipe: Evidence of a robust coherent structure

Abstract : In two independent articles, Escudier and Presti [1] and Peixinho et al. [2] studied experimentally the flow structure of a yield stress fluid in a cylindrical pipe. It was observed that the mean velocity profiles were axisymmetric in the laminar and turbulent regimes, and presented an increasing asymmetry with increasing Reynolds number in the transitional regime. The present paper provides a three-dimensional description of this asymmetry from axial velocity profiles measurements at three axial positions and different azimuthal positions. The observed transitional flow suggests the existence of a robust non-linear coherent state characterized by two weakly modulated counterrotating longitudinal vortices. This new state mediates the transition between laminar and turbulent flow and is qualitatively similar to the edge-states recently computed in the newtonian case [3-5].
Complete list of metadata
Contributor : Chérif Nouar Connect in order to contact the contributor
Submitted on : Monday, October 17, 2022 - 4:13:28 PM
Last modification on : Tuesday, November 22, 2022 - 10:54:21 AM


Files produced by the author(s)


Distributed under a Creative Commons Attribution 4.0 International License




Ahmed Esmael, Chérif Nouar. Transitional flow of a yield stress fluid in a pipe: Evidence of a robust coherent structure. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2008, 77 (5), pp.057302. ⟨10.1103/PhysRevE.77.057302⟩. ⟨hal-03818115⟩



Record views


Files downloads