Effect of Contraction Width on the Vortex Formation of Viscoelastic Flow in Asymmetric Planar Contractions

• YAMAGATA Takayuki

  Visualization Research Center, Niigata University

• YAJIMA Takahiro

  Faculty of Engineering, Niigata University

• FUJISAWA Nobuyuki

  Visualization Research Center, Niigata University

Abstract

In this paper, the flow behavior of viscoelastic fluid in asymmetric planar contraction geometry is studied by flow visualization and PIV measurement. Experiments are carried out for three channels of different contraction widths. The experimental results indicate that the flow field in the contraction channel is characterized by the Weissenberg number to Newtonian-like flow, transitional flow and vortex formation flow. It is found that the vortex formation flow occurs over the critical Weissenberg number, which is independent of the Reynolds number. However, the critical Weissenberg number decreases with increasing the contraction width due to the influence of velocity acceleration in the entry channel in the upstream of the contraction.

Journal

• Journal of Fluid Science and Technology

  Journal of Fluid Science and Technology 6 (6), 1011-1020, 2011

  The Japan Society of Mechanical Engineers

Keywords

• Viscoelastic Fluid
• Asymmetric Contraction
• Flow Visualization
• PIV
• Entry Flow

Details

• CRID: 1390001205245359104
• NII Article ID: 130001312858
• DOI: 10.1299/jfst.6.1011
• ISSN: 18805558
• Web Site: http://www.jstage.jst.go.jp/article/jfst/6/6/6_6_1011/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed