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Experimental Study of Heat Transfer Characteristics of a Bluff Body Interacting With a Rib by Using Liquid Crystal Thermography

Ghorbani-Tari, Zahra LU ; Wang, Lei LU and Sundén, Bengt LU (2014) ASME International Mechanical Engineering Congress and Exposition, 2013 In Proceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition Volume 8B: Heat Transfer and Thermal Engineering 8B. p.08-060
Abstract
In the present study, the effects of a single rib on the local heat transfer around a bluff body are examined by using the steady state liquid crystal technique. By varying the spacing between the bluff body and the rib, the interaction between the rib and the bluff body can be controlled. The bluff body is oriented vertically towards the flow direction and spans the whole height of the channel. The bluff body has a rectangular cross-section (height b = 80 mm, width 40 mm) while the rib has a square cross-section (rib height e= 10 mm, rib width 10 mm). The rib is placed in the upstream region of the bluff body either by a spacing L = 100 and 50 mm to yield nondimensional spacing to rib height ratios L/e = 10 and 5 respectively. Here, the... (More)
In the present study, the effects of a single rib on the local heat transfer around a bluff body are examined by using the steady state liquid crystal technique. By varying the spacing between the bluff body and the rib, the interaction between the rib and the bluff body can be controlled. The bluff body is oriented vertically towards the flow direction and spans the whole height of the channel. The bluff body has a rectangular cross-section (height b = 80 mm, width 40 mm) while the rib has a square cross-section (rib height e= 10 mm, rib width 10 mm). The rib is placed in the upstream region of the bluff body either by a spacing L = 100 and 50 mm to yield nondimensional spacing to rib height ratios L/e = 10 and 5 respectively. Here, the re-attachment length (x(R)) for a single rib is about 7.5e. The values of the Reynolds number based on the channel hydraulic diameter (D-h) are 55,000 and 89,000. The experimental results revealed that the presence of the rib at L/e = 10 has a more pronounced effect on the enhancement of the heat transfer upstream region of the bluff body. The effect of different L/e on the local Nu number distribution in the wake of the bluff body is small. (Less)
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author
organization
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type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Proceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition Volume 8B: Heat Transfer and Thermal Engineering
volume
8B
pages
08 - 060
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME International Mechanical Engineering Congress and Exposition, 2013
external identifiers
  • WOS:000360032700060
  • Scopus:84903455087
ISBN
978-0-7918-5635-2
DOI
10.1115/IMECE2013-64328
language
English
LU publication?
yes
id
76f81302-6ea0-4289-bc32-511fd63f3ae0 (old id 7969219)
date added to LUP
2015-09-23 07:40:35
date last changed
2017-01-01 08:03:18
@inproceedings{76f81302-6ea0-4289-bc32-511fd63f3ae0,
  abstract     = {In the present study, the effects of a single rib on the local heat transfer around a bluff body are examined by using the steady state liquid crystal technique. By varying the spacing between the bluff body and the rib, the interaction between the rib and the bluff body can be controlled. The bluff body is oriented vertically towards the flow direction and spans the whole height of the channel. The bluff body has a rectangular cross-section (height b = 80 mm, width 40 mm) while the rib has a square cross-section (rib height e= 10 mm, rib width 10 mm). The rib is placed in the upstream region of the bluff body either by a spacing L = 100 and 50 mm to yield nondimensional spacing to rib height ratios L/e = 10 and 5 respectively. Here, the re-attachment length (x(R)) for a single rib is about 7.5e. The values of the Reynolds number based on the channel hydraulic diameter (D-h) are 55,000 and 89,000. The experimental results revealed that the presence of the rib at L/e = 10 has a more pronounced effect on the enhancement of the heat transfer upstream region of the bluff body. The effect of different L/e on the local Nu number distribution in the wake of the bluff body is small.},
  author       = {Ghorbani-Tari, Zahra and Wang, Lei and Sundén, Bengt},
  booktitle    = {Proceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition Volume 8B: Heat Transfer and Thermal Engineering},
  isbn         = {978-0-7918-5635-2},
  language     = {eng},
  pages        = {08--060},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Experimental Study of Heat Transfer Characteristics of a Bluff Body Interacting With a Rib by Using Liquid Crystal Thermography},
  url          = {http://dx.doi.org/10.1115/IMECE2013-64328},
  volume       = {8B},
  year         = {2014},
}