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Experimental investigation of flow fields in a square channel roughened with various ribs on one wall

Wang, Lei LU ; Verbeek, M.M.J.F; Burgers, S.S and Sundén, Bengt LU (2006) 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 In Proceedings of the ASME Fluids Engineering Division p.251-257
Abstract
The present work studies the separated flow in a square channel with ribs on one wall by using the PIV method. In this study, the spacing between ribs is kept constant and the heights of rib are varied in order to investigate the influence of the pitch-to-height ratio, P/e on the flow structures. Depending on the various pitch ratios, the enclosure between ribs can be regarded as closed or open cavity. Results are included for mean velocity, streamlines, skin-friction coefficient, anisotropy parameter, turbulent kinetic energy production and two-point correlation. It is found that the separated shear layer in the closed cavity has strong momentum exchange with the mainstream. By contrast, the fluid contained in the open cavity is... (More)
The present work studies the separated flow in a square channel with ribs on one wall by using the PIV method. In this study, the spacing between ribs is kept constant and the heights of rib are varied in order to investigate the influence of the pitch-to-height ratio, P/e on the flow structures. Depending on the various pitch ratios, the enclosure between ribs can be regarded as closed or open cavity. Results are included for mean velocity, streamlines, skin-friction coefficient, anisotropy parameter, turbulent kinetic energy production and two-point correlation. It is found that the separated shear layer in the closed cavity has strong momentum exchange with the mainstream. By contrast, the fluid contained in the open cavity is self-sustained and the outside streamlines are almost parallel to the bottom wall. Moreover, for the open cavity, the velocity fluctuations become vigorous as the flow reattaches directly on the trailing edge. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Proceedings of the ASME Fluids Engineering Division
pages
251 - 257
publisher
American Society Of Mechanical Engineers (ASME)
conference name
2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
external identifiers
  • Scopus:84920633776
ISBN
0-7918-4770-5
DOI
10.1115/IMECE2006-13659
language
English
LU publication?
yes
id
35a20de7-72b9-4b36-a1d2-a0649968d444 (old id 1487690)
date added to LUP
2009-10-14 10:44:51
date last changed
2016-10-13 04:43:47
@misc{35a20de7-72b9-4b36-a1d2-a0649968d444,
  abstract     = {The present work studies the separated flow in a square channel with ribs on one wall by using the PIV method. In this study, the spacing between ribs is kept constant and the heights of rib are varied in order to investigate the influence of the pitch-to-height ratio, P/e on the flow structures. Depending on the various pitch ratios, the enclosure between ribs can be regarded as closed or open cavity. Results are included for mean velocity, streamlines, skin-friction coefficient, anisotropy parameter, turbulent kinetic energy production and two-point correlation. It is found that the separated shear layer in the closed cavity has strong momentum exchange with the mainstream. By contrast, the fluid contained in the open cavity is self-sustained and the outside streamlines are almost parallel to the bottom wall. Moreover, for the open cavity, the velocity fluctuations become vigorous as the flow reattaches directly on the trailing edge.},
  author       = {Wang, Lei and Verbeek, M.M.J.F and Burgers, S.S and Sundén, Bengt},
  isbn         = {0-7918-4770-5},
  language     = {eng},
  pages        = {251--257},
  publisher    = {ARRAY(0x11b3c3b0)},
  series       = {Proceedings of the ASME Fluids Engineering Division},
  title        = {Experimental investigation of flow fields in a square channel roughened with various ribs on one wall},
  url          = {http://dx.doi.org/10.1115/IMECE2006-13659},
  year         = {2006},
}