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Spatiotemporal flow instabilities of wormlike micellar solutions in rectangular microchannels

Title
Spatiotemporal flow instabilities of wormlike micellar solutions in rectangular microchannels
Type
Article in International Scientific Journal
Year
2014
Authors
Simon Haward
(Author)
FEUP
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Francisco Galindo Rosales
(Author)
FEUP
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Pierre Ballesta
(Author)
FEUP
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Manuel Alves
(Author)
FEUP
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Journal
Vol. 104
Pages: 124101-1-124101-5
ISSN: 0003-6951
Indexing
Publicação em ISI Web of Science ISI Web of Science
INSPEC
Scientific classification
FOS: Natural sciences
Other information
Authenticus ID: P-009-A0D
Abstract (EN): Flow velocimetry measurements are made on a non-shear-banding wormlike micellar solution within 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 the experiments (up to several hours). Here, spatiotemporally dependent ¿jets¿ of high velocity fluid are observed to fluctuate within regions of essentially stagnant fluid. The reason for this flow instability remains undetermined, but it has significant consequences for many industrial applications and also for microfluidic rheometry of complex fluids.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 5
License type: Click to view license CC BY-NC
Documents
File name Description Size
2014_apl_ballesta_micelles 1245.92 KB
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