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

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Pereira, AS (Author) Other; F. T. Pinho (Author) FEUP

Journal

Title: Experiments in Fluids

Vol. 32

Pages: 458-471

ISSN: 0723-4864

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 4 Citations

ISI Web of Science

Scopus - 5 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14