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Author(s): Simon Haward
Francisco Galindo Rosales
Pierre Ballesta
Manuel Alves
Title: Spatiotemporal flow instabilities of wormlike micellar solutions in rectangular microchannels
Issue Date: 2014
Abstract: Flow velocimetry measurements are made on a non-shear-banding wormlike micellar solutionwithin high-aspect-ratio rectilinear microchannels over a wide range of imposed steady flow rates.At the lowest and highest flow rates tested, Newtonian-like velocity profiles are measured.However, at intermediate flow rates the velocity field never stabilizes on the timescale of theexperiments (up to several hours). Here, spatiotemporally dependent jets of high velocity fluidare observed to fluctuate within regions of essentially stagnant fluid. The reason for this flowinstability remains undetermined, but it has significant consequences for many industrialapplications and also for microfluidic rheometry of complex fluids.
Subject: Ciências exactas e naturais
Natural sciences
Scientific areas: Ciências exactas e naturais
Natural sciences
Document Type: Artigo em Revista Científica Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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