Título: Chemical Engineering ScienceImportada do Authenticus Pesquisar Publicações da Revista

Vol. 111 Nº MAY 24 2014

Páginas: 364-380

ISSN: 0009-2509

Editora: Elsevier

ISI Web of Knowledge - 14 Citações

ISI Web of Science

Scopus - 26 Citações

INSPEC

COMPENDEX

FOS: Ciências da engenharia e tecnologias

ID Authenticus: P-009-B0E

DOI: 10.1016/j.ces.2014.02.033

Resumo (PT):

Abstract (EN): The flow of viscoelastic fluids past a confined cylinder in a rectangular duct was investigated experimentally and numerically in order to assess the three-dimensional effects associated with cylinder aspect ratio (AR) and the fluid rheology. The blockage ratio was 50%, the cylinder aspect ratios were AR¼16, 8 and 2, and the flow conditions tested varied from creeping flow conditions up to the onset of time-dependent flow. Three viscoelastic fluids were tested, namely a shear-thinning and two Boger fluids, and the results were compared against the numerical and experimental data for Newtonian fluids. For the shear-thinning fluid, and in the range of Deborah numbers (De) studied (0.025oDeo0.99), elastic instabilities appear upstream of the cylinder above a critical Deborah number, that depends on the aspect ratio. In contrast, for the Boger fluids the flow remained symmetric both upstream and downstream of the cylinder in the range of Deborah numbers studied (Deo1.3). For all non-Newtonian fluids studied, the streamwise velocity profiles show that the length required to achieve the fully developed velocity downstream of the cylinder increases with De and AR.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 17