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Control of jet impingement heat transfer in crossflow by using a rib

Wang, Lei LU ; Sundén, Bengt LU ; Borg, Andreas and Abrahamsson, Hans (2011) In International Journal of Heat and Mass Transfer 54(19-20). p.4157-4166
Abstract
Experimental studies are carried out to investigate the jet impingement heat transfer in crossflow by liquid crystal thermography (LCT). The aim is to assess the possibility of controlling heat transfer by using a rib. The crossflow Reynolds number spans from 80,000 to 160,000 and the velocity ratio ranges from 1.0 to 2.8. The results show that the presence of rib can significantly modify the heat transfer pattern of impinging jet. For all the tested cases, the presence of rib makes the Nusselt number profiles across the stagnation point change from a classical bell-shaped profile to a plateau-like pattern, indicating the enhanced heat transfer region expands more as the rib is present. In particular, the presence of rib has a more... (More)
Experimental studies are carried out to investigate the jet impingement heat transfer in crossflow by liquid crystal thermography (LCT). The aim is to assess the possibility of controlling heat transfer by using a rib. The crossflow Reynolds number spans from 80,000 to 160,000 and the velocity ratio ranges from 1.0 to 2.8. The results show that the presence of rib can significantly modify the heat transfer pattern of impinging jet. For all the tested cases, the presence of rib makes the Nusselt number profiles across the stagnation point change from a classical bell-shaped profile to a plateau-like pattern, indicating the enhanced heat transfer region expands more as the rib is present. In particular, the presence of rib has a more pronounced effect on the enhancement of heat transfer at lower velocity ratios (R = 1.0 and R = 1.4). However, in such cases, the local heat transfer in the rib corner region deteriorates. At higher velocity ratios (R = 2.0 and R = 2.8), the presence of rib makes the heat transfer rate more uniform, but meanwhile, it is found that the impinging jet effect tends to be weaker. (C) 2011 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heat transfer control, Jet impingement, Rib, LCT
in
International Journal of Heat and Mass Transfer
volume
54
issue
19-20
pages
4157 - 4166
publisher
Pergamon
external identifiers
  • wos:000293108300002
  • scopus:79959763809
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2011.06.004
language
English
LU publication?
yes
id
52de7cd2-417f-4381-a404-146c9b4757e4 (old id 2162937)
date added to LUP
2011-09-20 13:36:35
date last changed
2017-01-08 03:05:01
@article{52de7cd2-417f-4381-a404-146c9b4757e4,
  abstract     = {Experimental studies are carried out to investigate the jet impingement heat transfer in crossflow by liquid crystal thermography (LCT). The aim is to assess the possibility of controlling heat transfer by using a rib. The crossflow Reynolds number spans from 80,000 to 160,000 and the velocity ratio ranges from 1.0 to 2.8. The results show that the presence of rib can significantly modify the heat transfer pattern of impinging jet. For all the tested cases, the presence of rib makes the Nusselt number profiles across the stagnation point change from a classical bell-shaped profile to a plateau-like pattern, indicating the enhanced heat transfer region expands more as the rib is present. In particular, the presence of rib has a more pronounced effect on the enhancement of heat transfer at lower velocity ratios (R = 1.0 and R = 1.4). However, in such cases, the local heat transfer in the rib corner region deteriorates. At higher velocity ratios (R = 2.0 and R = 2.8), the presence of rib makes the heat transfer rate more uniform, but meanwhile, it is found that the impinging jet effect tends to be weaker. (C) 2011 Elsevier Ltd. All rights reserved.},
  author       = {Wang, Lei and Sundén, Bengt and Borg, Andreas and Abrahamsson, Hans},
  issn         = {0017-9310},
  keyword      = {Heat transfer control,Jet impingement,Rib,LCT},
  language     = {eng},
  number       = {19-20},
  pages        = {4157--4166},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Control of jet impingement heat transfer in crossflow by using a rib},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.06.004},
  volume       = {54},
  year         = {2011},
}