Transition to turbulence in pipe has been extensively studied but is still not completely understood and even more for non-Newtonian fluids. We focus here on yield stress shear-thinning fluids and the mechanism leading to the transition in pipe, the so-called rheo-inertial transition to turbulence. An experimental setup has enabled us to identify flow regimes in a cylindrical pipe, using both flow visualizations and pressure drops measurements for a range of Reynolds numbers. We delimited the non-Newtonian specific regime in the laminar-turbulent transition triggered at a critical Reynolds number below the turbulent puffs onset. This pre-transition regime is associated with a velocity profile asymmetry in which its degree and position evolve as the Reynolds number increases. The origin for the stability of this rheo-inertial regime is discussed, as it could be due to a competition between the nonlinear contributions of rheological behavior and flow inertia. Beyond this regime, we quantified the intermittence of puff transit, revealing the delay to turbulence. We spotted for the first time a different rheo-inertial transitional behavior in the intermittency evolution vs Reynolds number, displaying a smoother transition on a broader range. Finally, the critical Reynolds numbers for different yield stresses are compared with previous works, and the novelty is the linear increase in the delay to turbulent puffs with the yield stress.
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May 2024
Research Article|
May 24 2024
Asymmetry and intermittency in the rheo-inertial transition to turbulence in pipe flow
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Antoine Charles
;
Antoine Charles
(Conceptualization, Data curation, Formal analysis, Methodology, Writing – original draft, Writing – review & editing)
1
IMT Nord Europe, Institut Mines-Télécom, Center for Energy and Environment
, 59000 Lille, France
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Jorge Peixinho
;
Jorge Peixinho
(Formal analysis, Writing – review & editing)
2
Laboratoire PIMM, Arts et Métiers Institute of Technology, CNRS, Cnam, PIMM, HESAM Université
, 75013 Paris, France
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Thierry Ribeiro
;
Thierry Ribeiro
(Project administration)
3
Institut Polytechnique UniLaSalle, Université d'Artois
, ULR 7519, 19 rue Pierre Waguet, 60000 Beauvais, France
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Sam Azimi
;
Sam Azimi
(Funding acquisition, Project administration)
4
SIAAP—Service public pour l'assainissement francilien, Direction Innovation
, 82 Avenue Kléber, 92700 Colombes, France
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Vincent Rocher;
Vincent Rocher
(Funding acquisition, Project administration)
4
SIAAP—Service public pour l'assainissement francilien, Direction Innovation
, 82 Avenue Kléber, 92700 Colombes, France
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Jean-Christophe Baudez
;
Jean-Christophe Baudez
(Project administration)
1
IMT Nord Europe, Institut Mines-Télécom, Center for Energy and Environment
, 59000 Lille, France
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S. Amir Bahrani
S. Amir Bahrani
a)
(Conceptualization, Formal analysis, Methodology, Project administration, Supervision, Writing – review & editing)
1
IMT Nord Europe, Institut Mines-Télécom, Center for Energy and Environment
, 59000 Lille, France
a)Author to whom correspondence should be addressed: [email protected]
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Antoine Charles
1
Jorge Peixinho
2
Thierry Ribeiro
3
Sam Azimi
4
Vincent Rocher
4
Jean-Christophe Baudez
1
S. Amir Bahrani
1,a)
1
IMT Nord Europe, Institut Mines-Télécom, Center for Energy and Environment
, 59000 Lille, France
2
Laboratoire PIMM, Arts et Métiers Institute of Technology, CNRS, Cnam, PIMM, HESAM Université
, 75013 Paris, France
3
Institut Polytechnique UniLaSalle, Université d'Artois
, ULR 7519, 19 rue Pierre Waguet, 60000 Beauvais, France
4
SIAAP—Service public pour l'assainissement francilien, Direction Innovation
, 82 Avenue Kléber, 92700 Colombes, France
a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 36, 054120 (2024)
Article history
Received:
April 02 2024
Accepted:
May 12 2024
Citation
Antoine Charles, Jorge Peixinho, Thierry Ribeiro, Sam Azimi, Vincent Rocher, Jean-Christophe Baudez, S. Amir Bahrani; Asymmetry and intermittency in the rheo-inertial transition to turbulence in pipe flow. Physics of Fluids 1 May 2024; 36 (5): 054120. https://doi.org/10.1063/5.0211807
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