Spatiotemporal flow instabilities of wormlike micellar solutions in rectangular microchannels | Zendy

Simon J. Haward | Zendy; Francisco J. GalindoRosales | Zendy; Pierre Ballesta | Zendy; M.A. Alves | Zendy

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Spatiotemporal flow instabilities of wormlike micellar solutions in rectangular microchannels

Author(s) -

Simon J. Haward,

Francisco J. GalindoRosales,

Pierre Ballesta,

M.A. Alves

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4869476

Subject(s) - rheometry , velocimetry , mechanics , instability , flow (mathematics) , microfluidics , newtonian fluid , rheology , complex fluid , materials science , volumetric flow rate , fluid dynamics , shear flow , flow velocity , non newtonian fluid , shear rate , viscosity , flow focusing , flow visualization , thermodynamics , physics , nanotechnology

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

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