Spatiotemporal flow instabilities of wormlike micellar solutions in rectangular microchannels

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Simon Haward (Autor) FEUP; Francisco Galindo Rosales (Autor) FEUP; Pierre Ballesta (Autor) FEUP; Manuel Alves (Autor) FEUP

Revista

Título: Applied Physics Letters

Vol. 104

Páginas: 124101-1-124101-5

ISSN: 0003-6951

Editora: American Institute of Physics

Indexação

ISI Web of Knowledge - 17 Citações

ISI Web of Science

Scopus - 22 Citações

INSPEC

Classificação Científica

FOS: Ciências exactas e naturais

Outras Informações

ID Authenticus: P-009-A0D

DOI: 10.1063/1.4869476

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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5