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Heat transfer and pressure drop in a smooth and ribbed turn region of a two-pass channel

Wang, Chenglong LU ; Wang, Lei LU and Sundén, Bengt LU (2015) In Applied Thermal Engineering 85. p.225-233
Abstract
In the present study, the heat transfer and pressure drop in the turn region of a two-pass channel have been investigated experimentally. The liquid crystal thermography method is utilized to measure local heat transfer rates. Eight cases were tested, including one smooth, and seven different rib-roughened turn surfaces. The tested Reynolds numbers are 20,000 and 26,000, respectively. Results indicate that the heat transfer on the smooth outer wall is dominated by the flow impingement. When ribs are fitted onto the outer wall, the heat transfer patterns are significantly altered. However, the presence of ribs augments the heat transfer at the penalty of increased heat transfer non-uniformity and pressure loss. In order to provide optimized... (More)
In the present study, the heat transfer and pressure drop in the turn region of a two-pass channel have been investigated experimentally. The liquid crystal thermography method is utilized to measure local heat transfer rates. Eight cases were tested, including one smooth, and seven different rib-roughened turn surfaces. The tested Reynolds numbers are 20,000 and 26,000, respectively. Results indicate that the heat transfer on the smooth outer wall is dominated by the flow impingement. When ribs are fitted onto the outer wall, the heat transfer patterns are significantly altered. However, the presence of ribs augments the heat transfer at the penalty of increased heat transfer non-uniformity and pressure loss. In order to provide optimized rib configurations, the thermal performance is evaluated, which balances the enhanced heat transfer and increased pressure loss. The results can be used for the development of cooling techniques in gas turbines and validation of numerical simulations. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heat transfer enhancement, Blade-tip cooling, Two-pass channel, Liquid, crystal thermography
in
Applied Thermal Engineering
volume
85
pages
225 - 233
publisher
Elsevier
external identifiers
  • wos:000356982300023
  • scopus:84928952380
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2015.03.079
language
English
LU publication?
yes
id
6d1f12cc-f58d-4849-bef5-1cbf4e5c8cd1 (old id 7791081)
date added to LUP
2015-09-02 10:31:42
date last changed
2017-07-09 03:12:17
@article{6d1f12cc-f58d-4849-bef5-1cbf4e5c8cd1,
  abstract     = {In the present study, the heat transfer and pressure drop in the turn region of a two-pass channel have been investigated experimentally. The liquid crystal thermography method is utilized to measure local heat transfer rates. Eight cases were tested, including one smooth, and seven different rib-roughened turn surfaces. The tested Reynolds numbers are 20,000 and 26,000, respectively. Results indicate that the heat transfer on the smooth outer wall is dominated by the flow impingement. When ribs are fitted onto the outer wall, the heat transfer patterns are significantly altered. However, the presence of ribs augments the heat transfer at the penalty of increased heat transfer non-uniformity and pressure loss. In order to provide optimized rib configurations, the thermal performance is evaluated, which balances the enhanced heat transfer and increased pressure loss. The results can be used for the development of cooling techniques in gas turbines and validation of numerical simulations.},
  author       = {Wang, Chenglong and Wang, Lei and Sundén, Bengt},
  issn         = {1359-4311},
  keyword      = {Heat transfer enhancement,Blade-tip cooling,Two-pass channel,Liquid,crystal thermography},
  language     = {eng},
  pages        = {225--233},
  publisher    = {Elsevier},
  series       = {Applied Thermal Engineering},
  title        = {Heat transfer and pressure drop in a smooth and ribbed turn region of a two-pass channel},
  url          = {http://dx.doi.org/10.1016/j.applthermaleng.2015.03.079},
  volume       = {85},
  year         = {2015},
}