Transitional flow of a non-newtonian fluid in a pipe: Experimental evidence of weak turbulence induced by shear thinning behavior - Archive ouverte HAL Access content directly
Journal Articles Physics of Fluids Year : 2010

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

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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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Dates and versions

hal-03767280 , version 1 (01-09-2022)

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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, 2010, ⟨10.1063/1.3491511⟩. ⟨hal-03767280⟩
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