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Thermal and flow field characteristics in a rectangular duct with broken V-shaped ribs

Wang, Lieke LU ; Gao, Xiufang LU and Sundén, Bengt LU (2003) ASME Summer Heat Transfer Conference (HT2003), 2003 In Proceedings of the ASME Summer Heat Transfer Conference 2003. p.637-643
Abstract
In the present study, the thermal and hydraulic characteristics of a rectangular duct with aspect ratio of 1/8 roughened by broken V-shaped ribs pointing upstream are investigated experimentally using Liquid Crystal Thermography (LCT) and Particle Image Velocimetry (PIV). The heat transfer distributions on the roughened wall were evaluated using liquid crystal images. It was found that the heat transfer coefficient had a spanwise variation on the ribbed wall, with high heat transfer coefficient at the upstream end of the rib and low value at the other end, similar to the continuous V-shaped ribs. However, the heat transfer distribution in the case of broken V-shaped ribs was observed more uniform, with local maxima due to the gap flow. In... (More)
In the present study, the thermal and hydraulic characteristics of a rectangular duct with aspect ratio of 1/8 roughened by broken V-shaped ribs pointing upstream are investigated experimentally using Liquid Crystal Thermography (LCT) and Particle Image Velocimetry (PIV). The heat transfer distributions on the roughened wall were evaluated using liquid crystal images. It was found that the heat transfer coefficient had a spanwise variation on the ribbed wall, with high heat transfer coefficient at the upstream end of the rib and low value at the other end, similar to the continuous V-shaped ribs. However, the heat transfer distribution in the case of broken V-shaped ribs was observed more uniform, with local maxima due to the gap flow. In addition, the saw-tooth fashion of heat transfer distribution was also observed along the streamwise direction. The isothermal flow field measurements were obtained by PIV to catch the flow structures introduced by the ribs. The spanwise profile of the main flow velocity was found altered, and a complicated secondary flow was detected over the cross section. This flow phenomenon was caused by the ribs and the gaps between ribs. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Liquid crystal thermography (LCT), Particle image velocimetry (PIV)
in
Proceedings of the ASME Summer Heat Transfer Conference
volume
2003
pages
637 - 643
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME Summer Heat Transfer Conference (HT2003), 2003
external identifiers
  • Scopus:1842679166
ISBN
0791836932
language
English
LU publication?
yes
id
2b35f120-fe73-4770-8327-be419beab84b (old id 612351)
date added to LUP
2007-11-29 13:20:16
date last changed
2016-10-13 04:46:37
@misc{2b35f120-fe73-4770-8327-be419beab84b,
  abstract     = {In the present study, the thermal and hydraulic characteristics of a rectangular duct with aspect ratio of 1/8 roughened by broken V-shaped ribs pointing upstream are investigated experimentally using Liquid Crystal Thermography (LCT) and Particle Image Velocimetry (PIV). The heat transfer distributions on the roughened wall were evaluated using liquid crystal images. It was found that the heat transfer coefficient had a spanwise variation on the ribbed wall, with high heat transfer coefficient at the upstream end of the rib and low value at the other end, similar to the continuous V-shaped ribs. However, the heat transfer distribution in the case of broken V-shaped ribs was observed more uniform, with local maxima due to the gap flow. In addition, the saw-tooth fashion of heat transfer distribution was also observed along the streamwise direction. The isothermal flow field measurements were obtained by PIV to catch the flow structures introduced by the ribs. The spanwise profile of the main flow velocity was found altered, and a complicated secondary flow was detected over the cross section. This flow phenomenon was caused by the ribs and the gaps between ribs.},
  author       = {Wang, Lieke and Gao, Xiufang and Sundén, Bengt},
  isbn         = {0791836932},
  keyword      = {Liquid crystal thermography (LCT),Particle image velocimetry (PIV)},
  language     = {eng},
  pages        = {637--643},
  publisher    = {ARRAY(0xa1ac398)},
  series       = {Proceedings of the ASME Summer Heat Transfer Conference},
  title        = {Thermal and flow field characteristics in a rectangular duct with broken V-shaped ribs},
  volume       = {2003},
  year         = {2003},
}