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Drag increase at the very start of drag reducing flows in a rotating cylindrical double gap device

type de publication      article dans une revue internationale avec comité de lecture
date de publication 27-08-2014
auteur(s) Andrade Rafhael M.; Pereira Anselmo Soeiro; Soares Edson José
journal (abréviation) Journal of Non-Newtonian Fluid Mechanics (Journal of Non-Newtonian Fluid Mechanics)
volume (numéro) 212
pages 73 – 79
résumé In this note we present some results concerning the time required for turbulent structures to achieve their steady state, called here the developing time. Notably, there is a drag increase at the very start of the test. Such a drag increase is strongly dependent on the concentration, molecular weight, temperature, Reynolds number, and molecule conformation before the test start-up. The analysis conducted here improves the understanding of the way drag reduction evolves over time, which was considered in Pereira et al. (2013).
mots clés Drag increase; Development time; Turbulent structures development
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