Transitional flow of a non-newtonian fluid in a pipe: Experimental evidence of weak turbulence induced by shear thinning behavior
Résumé
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.
Domaines
Science non linéaire [physics]
Origine : Fichiers produits par l'(les) auteur(s)