The effect of the expansion ratio on a turbulent non-Newtonian recirculating flow

• Tipo: Artigo em Revista Científica Internacional
• Data: 2002

Autores

Pereira, AS (Autor) Outra; F. T. Pinho (Autor) FEUP

Revista

Título: Experiments in Fluids

Vol. 32

Páginas: 458-471

ISSN: 0723-4864

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 4 Citações

ISI Web of Science

Scopus - 5 Citações

Outras Informações

ID Authenticus: P-000-PT3

DOI: 10.1007/s00348-001-0386-3

Abstract (EN): Measurements of the mean and turbulent flow characteristics of shear-thinning moderately elastic 0.1% and 0.2% xanthan gum aqueous solutions were carried out in a sudden expansion having a diameter ratio of 2. The inlet flow was turbulent and fully developed, and the results were compared with data for water in the same geometry and with previous published Newtonian and non-Newtonian data in a smaller expansion of diameter ratio equal to 1.538. An increase in expansion ratio led to an increase in the recirculation length and in the axial normal Reynolds stress at identical normalised locations, but the difference between Newtonian and non-Newtonian characteristics was less intense than in the smaller expansion. An extensive comparison of mean and turbulent flow characteristics was carried out in order to understand the variation of flow features.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14