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Transitional flow of a non-newtonian fluid in a pipe: Experimental evidence of weak turbulence induced by shear thinning behavior

Abstract : The present paper is a thorough study of the flow regime where an asymmetry of the mean axial velocity profiles is observed for shear-thinning fluids flow in a pipe [? ]. This study is based on statistical analysis of the axial velocity fluctuations. It is shown that this flow regime exhibits features of a weak turbulence: chaotic in time and regular in space. More precisely: (i) power spectra of axial velocity fluctuations decay following a power law with an exponent very close to −3, (ii) large-scale coherent structures are generated and (iii) there is essentially no intermittency in this flow regime.
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https://hal-cnrs.archives-ouvertes.fr/hal-03767280
Contributor : Chérif Nouar Connect in order to contact the contributor
Submitted on : Thursday, September 1, 2022 - 5:36:06 PM
Last modification on : Wednesday, September 21, 2022 - 9:36:28 AM

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A Esmael, C Nouar, A Lefèvre, N Kabouya. Transitional flow of a non-newtonian fluid in a pipe: Experimental evidence of weak turbulence induced by shear thinning behavior. Physics of Fluids, American Institute of Physics, 2010, ⟨10.1063/1.3491511⟩. ⟨hal-03767280⟩

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