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Experimental investigation of local heat transfer in a square duct with continuous and truncated ribs

Wang, Lei LU and Sundén, Bengt LU (2005) In Experimental Heat Transfer 18(3). p.179-197
Abstract
In the present study, the turbulent heat transfer and fiction in a square duct roughened by continuous and truncated ribs on one wall has been investigated experimentally. The ribs are oriented transversely to the main stream in a periodic arrangement. For both cases, the rib height-to-hydraulic diameter ratio is 0.15, the rib pitch-to-height ratio is fixed at 12, and the Reynolds number varies from 8,000-20,000. Liquid crystal thermography is applied to demonstrate detailed distribution of heat transfer coefficient between a pair of ribs. The results show that the horseshoe vortices produced by truncated ribs are quite different from the flow structures altered by continuous ribs. It is noted that continuous ribs give higher heat transfer... (More)
In the present study, the turbulent heat transfer and fiction in a square duct roughened by continuous and truncated ribs on one wall has been investigated experimentally. The ribs are oriented transversely to the main stream in a periodic arrangement. For both cases, the rib height-to-hydraulic diameter ratio is 0.15, the rib pitch-to-height ratio is fixed at 12, and the Reynolds number varies from 8,000-20,000. Liquid crystal thermography is applied to demonstrate detailed distribution of heat transfer coefficient between a pair of ribs. The results show that the horseshoe vortices produced by truncated ribs are quite different from the flow structures altered by continuous ribs. It is noted that continuous ribs give higher heat transfer augmentation and pressure drop than truncated ribs. Moreover, the truncated ribs cannot be employed to eliminate hot spots which occur in the corresponding continuous types. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
augmentation, convective heat transfer, ribbed duct, liquid crystal thermography
in
Experimental Heat Transfer
volume
18
issue
3
pages
179 - 197
publisher
Taylor & Francis
external identifiers
  • wos:000229547600006
  • scopus:20944439791
ISSN
0891-6152
DOI
10.1080/08916150590953397
language
English
LU publication?
yes
id
5196e052-cb64-4d8f-961c-46c99e476726 (old id 238756)
date added to LUP
2007-08-13 10:51:36
date last changed
2017-09-24 03:43:03
@article{5196e052-cb64-4d8f-961c-46c99e476726,
  abstract     = {In the present study, the turbulent heat transfer and fiction in a square duct roughened by continuous and truncated ribs on one wall has been investigated experimentally. The ribs are oriented transversely to the main stream in a periodic arrangement. For both cases, the rib height-to-hydraulic diameter ratio is 0.15, the rib pitch-to-height ratio is fixed at 12, and the Reynolds number varies from 8,000-20,000. Liquid crystal thermography is applied to demonstrate detailed distribution of heat transfer coefficient between a pair of ribs. The results show that the horseshoe vortices produced by truncated ribs are quite different from the flow structures altered by continuous ribs. It is noted that continuous ribs give higher heat transfer augmentation and pressure drop than truncated ribs. Moreover, the truncated ribs cannot be employed to eliminate hot spots which occur in the corresponding continuous types.},
  author       = {Wang, Lei and Sundén, Bengt},
  issn         = {0891-6152},
  keyword      = {augmentation,convective heat transfer,ribbed duct,liquid crystal thermography},
  language     = {eng},
  number       = {3},
  pages        = {179--197},
  publisher    = {Taylor & Francis},
  series       = {Experimental Heat Transfer},
  title        = {Experimental investigation of local heat transfer in a square duct with continuous and truncated ribs},
  url          = {http://dx.doi.org/10.1080/08916150590953397},
  volume       = {18},
  year         = {2005},
}