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Experimental Measurement of Laminar Axisymmetric Flow Through Confined Annular Geometries With Sudden Inward Expansion

[+] Author Affiliations
Afshin Goharzadeh, Peter Rodgers

The Petroleum Institute, Abu Dhabi, United Arab Emirates

Paper No. IMECE2008-69237, pp. 375-378; 4 pages
doi:10.1115/IMECE2008-69237
From:
  • ASME 2008 International Mechanical Engineering Congress and Exposition
  • Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C
  • Boston, Massachusetts, USA, October 31–November 6, 2008
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4871-5 | eISBN: 978-0-7918-3840-2
  • Copyright © 2008 by ASME

abstract

In this paper separated and reattaching laminar flows produced by a sudden inward expansion within confined annular geometries are experimentally studied. Using Particle Image Velocimetry (PIV), combined with refractive index matching, the structure of fluid flow at the expansion region was investigated. Detailed measurement of the velocities, the reattachment length (Lr ) and the relative eddy intensity (ξ) are obtained for two different expansion ratios of ε = 1.4 and 1.6. The measured variation of the reattachment length as a function of Reynolds number (50 < Re < 600) was found to be non-linear for these expansion ratios. Eddy intensity was found to depend strongly on both Reynolds number and expansion ratio, with the relationship between ξ and Re being non-linear. Overall corresponding numerical predictions obtained by Nag & Datta [1] are in good agreement with the measurement results presented.

Copyright © 2008 by ASME

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