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Title: Asymmetry in transitional pipe flow of drag-reducing polymer solutions
Authors: Escudier, Marcel
Rosa, Sérgio
Poole, Rob
Keywords: Non-Newtonain
Transitional flow
Drag reducing
Issue Date: 2009
Publisher: Elsevier
Citation: Escudier, Marcel; Rosa, Sérgio; Poole, Rob (2009) - Asymmetry in transitional pipe flow of drag-reducing polymer solutions. Journal of Non-Newtonian Fluid Mechanics. ISSN 0377-0257. 161:1-3, p. 19-29
Abstract: New experimental data are presented and discussed for fully developed pipe flow of shear-thinning, viscoelastic polymer solutions in the transitional regime between laminar and turbulent flow. The data confirm that such transitional flows exhibit significant departures from axisymmetry in contrast to the fully developed pipe flow of Newtonian fluids or both laminar and turbulent flows of such drag-reducing liquids. The azimuthal structure of the asymmetry is investigated together with its axial development and also the velocity fluctuation levels. These data do not lead to an explanation for the asymmetry but do suggest that the influence of the flow geometry both upstream and downstream can be ruled out.
ISSN: 0377-0257
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Appears in Collections:DMA - Artigos em Revistas Indexados ao ISI/Scopus

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