Purely-elastic flow instabilities and elastic turbulence in microfluidic cross-slot devices

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Sousa, PC (Autor) FEUP; F. T. Pinho (Autor) FEUP; Alves, MA (Autor) FEUP

Revista

Título: Soft Matter

Vol. 14

Páginas: 1344-1354

ISSN: 1744-683X

Editora: Royal Society of Chemistry

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 24 Citações

Outras Informações

ID Authenticus: P-00N-P8G

DOI: 10.1039/c7sm01106g

Abstract (EN): We experimentally investigate the dynamics of viscoelastic fluid flows in cross-slot microgeometries under creeping flow conditions. We focus on the unsteady flow regime observed at high Weissenberg numbers (Wi) with the purpose of understanding the underlying flow signature of elastic turbulence. The effects of the device aspect ratio and fluid rheology on the unsteady flow state are investigated. Visualization of the flow patterns and time-resolved micro-particle image velocimetry were carried out to study the fluid flow behavior for a wide range of Weissenberg numbers. A periodic flow behavior is observed at low Weissenberg numbers followed by a more complex dynamics as Wi increases, eventually leading to the onset of elastic turbulence for very high Weissenberg numbers.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11