Power consumption of polymer solutions in a stirred vessel powered by an hyperboloid impeller

• Type: Article in International Scientific Journal
• Date: 2000

Authors

A. S. Cavadas (Author) Other; Fernando T. Pinho (Author) FEUP

Journal

Title: American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED

Vol. 255

Pages: 33-41

ISSN: 0888-8116

Publisher: ROYAL SOC CHEMISTRY

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-007-BH3

Abstract (EN): Measurements of power consumption in stirred vessel flows powered by a Rushton and an Hyperboloid impeller were carried out. The fluids were aqueous solutions of tylose, CMC and xanthan gum at weight concentrations ranging from 0.1% to 0.6% and also included Newtonian fluids. For the Rushton turbine flows the addition of polymer increased the Newton number by about 13-20% at Reynolds numbers in the range 1,000-3,000, whereas with the hyperboloid impeller the Newton number decreased about 13%. This decrease was especially noticeable for the CMC solutions and was absent from the 0.2% tylose solution flow. Concentrated aqueous solutions of CMC (5.2%) and XG (3.6%) were also produced to determine the characteristic impeller parameter k for the hyperboloid, following the procedure of Metzner and Otto (1957) which was found to be 48 ±16.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9