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Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation

Wang, Jinsheng LU ; Luo, Lei ; Wang, Lei LU ; Sunden, Bengt Ake LU and Wang, Songtao (2018) In International Journal of Numerical Methods for Heat and Fluid Flow 28(3). p.661-683
Abstract

Purpose: The fluid flow in a rotating channel is obviously different from that in a stationary channel due to the existence of Coriolis force, which, in turn, enhances the heat transfer on the trailing side and reduces the heat transfer on the leading side. The purpose of this paper is to study various rib configurations combined with channel orientation on heat transfer and frictional loss in a rotating channel. Design/methodology/approach: In the present study, the k-ω SST model was used as the turbulence model. The fluid flow direction in the channel is radially outward. The angle between the rotation axis and leading side is 45°. The channel aspect ratio (W/H) is 2, the blockage ratio (e/Dn) is 0.1 and the pitch ratio... (More)

Purpose: The fluid flow in a rotating channel is obviously different from that in a stationary channel due to the existence of Coriolis force, which, in turn, enhances the heat transfer on the trailing side and reduces the heat transfer on the leading side. The purpose of this paper is to study various rib configurations combined with channel orientation on heat transfer and frictional loss in a rotating channel. Design/methodology/approach: In the present study, the k-ω SST model was used as the turbulence model. The fluid flow direction in the channel is radially outward. The angle between the rotation axis and leading side is 45°. The channel aspect ratio (W/H) is 2, the blockage ratio (e/Dn) is 0.1 and the pitch ratio (P/e) is 10. The Reynolds number is fixed at 10,000 and the rotation number varies from 0 to 0.7. Angled ribs, reversed angled ribs, standard V-shaped ribs and outer-leaning V-shaped ribs, are examined. Findings: It is found that the reversed angled rib configuration and the outer-leaning V-shaped rib configuration display better heat transfer performance than the V-shaped ribs in rotating condition, which is in contrast to stationary condition. At the leading side, the reversed angled rib and the outer-leaning V-shaped rib show better performance in recovering the heat transfer recession due to the negative effects of the Coriolis force. Research limitations/implications: In the present study, the fluid is incompressible with constant thermophysical properties and the flow is steady. Practical implications: The results of this study will be helpful in design of ribbed channels internal cooling for turbine blade. Originality/value: The results imply that the rib configuration combined with channel orientation significantly impacts the heat transfer performance in a rotating channel. The reversed angled rib and the outer-leaning V-shaped rib show better heat transfer performance than standard V-shaped ribs, especially at high Rotating numbers, which is in contrast to stationary condition. The outer-leaning V-shaped rib has a relatively good heat transfer uniformity along the widthwise direction.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Channel orientation, Coriolis force, Heat transfer, Numerical simulation, Ribs
in
International Journal of Numerical Methods for Heat and Fluid Flow
volume
28
issue
3
pages
23 pages
publisher
Emerald Group Publishing Limited
external identifiers
  • scopus:85044595480
ISSN
0961-5539
DOI
10.1108/HFF-04-2017-0139
language
English
LU publication?
yes
id
7748dfc1-cf6e-4508-b227-103de7c74fc9
date added to LUP
2018-04-12 13:31:41
date last changed
2020-04-02 01:53:11
@article{7748dfc1-cf6e-4508-b227-103de7c74fc9,
  abstract     = {<p>Purpose: The fluid flow in a rotating channel is obviously different from that in a stationary channel due to the existence of Coriolis force, which, in turn, enhances the heat transfer on the trailing side and reduces the heat transfer on the leading side. The purpose of this paper is to study various rib configurations combined with channel orientation on heat transfer and frictional loss in a rotating channel. Design/methodology/approach: In the present study, the k-ω SST model was used as the turbulence model. The fluid flow direction in the channel is radially outward. The angle between the rotation axis and leading side is 45°. The channel aspect ratio (W/H) is 2, the blockage ratio (e/D<sub>n</sub>) is 0.1 and the pitch ratio (P/e) is 10. The Reynolds number is fixed at 10,000 and the rotation number varies from 0 to 0.7. Angled ribs, reversed angled ribs, standard V-shaped ribs and outer-leaning V-shaped ribs, are examined. Findings: It is found that the reversed angled rib configuration and the outer-leaning V-shaped rib configuration display better heat transfer performance than the V-shaped ribs in rotating condition, which is in contrast to stationary condition. At the leading side, the reversed angled rib and the outer-leaning V-shaped rib show better performance in recovering the heat transfer recession due to the negative effects of the Coriolis force. Research limitations/implications: In the present study, the fluid is incompressible with constant thermophysical properties and the flow is steady. Practical implications: The results of this study will be helpful in design of ribbed channels internal cooling for turbine blade. Originality/value: The results imply that the rib configuration combined with channel orientation significantly impacts the heat transfer performance in a rotating channel. The reversed angled rib and the outer-leaning V-shaped rib show better heat transfer performance than standard V-shaped ribs, especially at high Rotating numbers, which is in contrast to stationary condition. The outer-leaning V-shaped rib has a relatively good heat transfer uniformity along the widthwise direction.</p>},
  author       = {Wang, Jinsheng and Luo, Lei and Wang, Lei and Sunden, Bengt Ake and Wang, Songtao},
  issn         = {0961-5539},
  language     = {eng},
  month        = {01},
  number       = {3},
  pages        = {661--683},
  publisher    = {Emerald Group Publishing Limited},
  series       = {International Journal of Numerical Methods for Heat and Fluid Flow},
  title        = {Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation},
  url          = {http://dx.doi.org/10.1108/HFF-04-2017-0139},
  doi          = {10.1108/HFF-04-2017-0139},
  volume       = {28},
  year         = {2018},
}