Extensional Flow of Water and a Semi-Dilute Aqueous Solution of Polyethylene Oxide through Microfabricated Hyperbolic Contractions

• Type: Article in International Conference Proceedings Book
• Date: 2006

Authors

Mónica S. Neves Oliveira (Author) FEUP; Manuel A. Alves (Author) FEUP; Gareth H. McKinley (Author) Other; Fernando T. Pinho (Author) FEUP

Conference proceedings International

Title: 13th Int Symp on Applications of Laser Techniques to Fluid Mechanics

Pages: 1-15

13th Int Symp on Applications of Laser Techniques to Fluid Mechanics

Lisboa, Portugal, 26 a 29 de Junho de 2006

Scientific classification

FOS: Engineering and technology

Other information

Abstract (EN): The flow of a Newtonian fluid and a viscoelastic semi-dilute aqueous solution of polyethylene oxide (PEO) through microfabricated hyperbolic contractions was studied experimentally. A set of planar converging geometries, with total Hencky strains ranging from 1 to 3.7, were designed to produce an extensional flow field within the contraction. The flow in the contraction region was experimentally investigated by means of streak photography and micro particle image velocimetry (µPIV). Using this laser based technique, we were able to characterize quantitatively the velocity field at a given plane in the hyperbolic contraction. The pressure drop across the converging geometry was also measured and non-linear effects, attributable to viscoelasticity, were observed for the PEO solution. The Newtonian results compared favorably with those predicted numerically using a finite-volume method.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15