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Endwall convective heat transfer for bluff bodies

Wang, Lei LU ; Salewski, Mirko LU ; Sundén, Bengt LU ; Borg, Andreas and Abrahamsson, Hans (2012) In International Communications in Heat and Mass Transfer 39(2). p.167-173
Abstract
The endwall heat transfer characteristics of forced flow past bluff bodies have been investigated using liquid crystal thermography (LCT). The bluff body is placed in a rectangular channel with both its ends attached to the endwalls. The Reynolds number varies from 50,000 to 100,000. In this study, a single bluff body and two bluff bodies arranged in tandem are considered. Due to the formation of horseshoe vortices, the heat transfer is enhanced appreciably for both cases. However, for the case of two bluff bodies in tandem, it is found that the presence of the second bluff body decreases the heat transfer as compared to the case of a single bluff body. In addition, the results show that the heat transfer exhibits Reynolds number... (More)
The endwall heat transfer characteristics of forced flow past bluff bodies have been investigated using liquid crystal thermography (LCT). The bluff body is placed in a rectangular channel with both its ends attached to the endwalls. The Reynolds number varies from 50,000 to 100,000. In this study, a single bluff body and two bluff bodies arranged in tandem are considered. Due to the formation of horseshoe vortices, the heat transfer is enhanced appreciably for both cases. However, for the case of two bluff bodies in tandem, it is found that the presence of the second bluff body decreases the heat transfer as compared to the case of a single bluff body. In addition, the results show that the heat transfer exhibits Reynolds number similarity. For a single bluff body, the Nusselt number profiles collapse well when the data are scaled by Re-0.55; for two bluff bodies arranged in tandem, the heat transfer scaling is changed to Re-0.51, indicating that the power index of Reynolds number is flow dependent. (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
LCT, Bluff bodies, Heat transfer scaling, Endwall heat transfer
in
International Communications in Heat and Mass Transfer
volume
39
issue
2
pages
167 - 173
publisher
Elsevier
external identifiers
  • wos:000301613300002
  • scopus:84862830275
ISSN
0735-1933
DOI
10.1016/j.icheatmasstransfer.2011.10.006
language
English
LU publication?
yes
id
db221590-e974-40e7-9382-938011f65eff (old id 2515866)
date added to LUP
2012-05-15 08:24:36
date last changed
2017-09-24 03:21:52
@article{db221590-e974-40e7-9382-938011f65eff,
  abstract     = {The endwall heat transfer characteristics of forced flow past bluff bodies have been investigated using liquid crystal thermography (LCT). The bluff body is placed in a rectangular channel with both its ends attached to the endwalls. The Reynolds number varies from 50,000 to 100,000. In this study, a single bluff body and two bluff bodies arranged in tandem are considered. Due to the formation of horseshoe vortices, the heat transfer is enhanced appreciably for both cases. However, for the case of two bluff bodies in tandem, it is found that the presence of the second bluff body decreases the heat transfer as compared to the case of a single bluff body. In addition, the results show that the heat transfer exhibits Reynolds number similarity. For a single bluff body, the Nusselt number profiles collapse well when the data are scaled by Re-0.55; for two bluff bodies arranged in tandem, the heat transfer scaling is changed to Re-0.51, indicating that the power index of Reynolds number is flow dependent. (C) 2011 Elsevier Ltd. All rights reserved.},
  author       = {Wang, Lei and Salewski, Mirko and Sundén, Bengt and Borg, Andreas and Abrahamsson, Hans},
  issn         = {0735-1933},
  keyword      = {LCT,Bluff bodies,Heat transfer scaling,Endwall heat transfer},
  language     = {eng},
  number       = {2},
  pages        = {167--173},
  publisher    = {Elsevier},
  series       = {International Communications in Heat and Mass Transfer},
  title        = {Endwall convective heat transfer for bluff bodies},
  url          = {http://dx.doi.org/10.1016/j.icheatmasstransfer.2011.10.006},
  volume       = {39},
  year         = {2012},
}