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Heat Transfer in a Channel under Effects of a Shallow-Angle Jet Impingement and a Rib

Wang, Lei LU ; Sundén, Bengt LU ; Borg, Andreas and Abrahamsson, Hans (2012) ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition In Proceedings of the Asme Turbo Expo 2011, Vol 5, Pts A and B p.1617-1624
Abstract
Experimental studies are carried out to investigate the heat transfer characteristics involving an impinging jet with a shallow-angle in a crossflow. A rib is applied to control the jet impingement heat transfer Liquid crystal technique is employed to measure the wall temperature and obtain the heat transfer coefficients. In the study, the Reynolds number for the crossflow is 80,000 and the Reynolds number for the jet ranges from 20,000 to 40,000. This gives rise to the jet-to-crossflow velocity ratio varying from 1.4 to 2.8. For all the tested cases, it is found that 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... (More)
Experimental studies are carried out to investigate the heat transfer characteristics involving an impinging jet with a shallow-angle in a crossflow. A rib is applied to control the jet impingement heat transfer Liquid crystal technique is employed to measure the wall temperature and obtain the heat transfer coefficients. In the study, the Reynolds number for the crossflow is 80,000 and the Reynolds number for the jet ranges from 20,000 to 40,000. This gives rise to the jet-to-crossflow velocity ratio varying from 1.4 to 2.8. For all the tested cases, it is found that 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 ratio (R = 1.4). However, in such case, the local heat transfer in the rib corner region deteriorates. At higher velocity ratio, especially at 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 (Less)
Please use this url to cite or link to this publication:
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Proceedings of the Asme Turbo Expo 2011, Vol 5, Pts A and B
pages
1617 - 1624
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
external identifiers
  • WOS:000321076300144
  • Scopus:84865465420
ISBN
978-0-7918-5465-5
DOI
10.1115/GT2011-46333
language
English
LU publication?
yes
id
100f3a82-852d-417a-b21a-d1a1ae20e753 (old id 3979502)
date added to LUP
2013-09-05 14:31:34
date last changed
2016-10-13 04:47:34
@misc{100f3a82-852d-417a-b21a-d1a1ae20e753,
  abstract     = {Experimental studies are carried out to investigate the heat transfer characteristics involving an impinging jet with a shallow-angle in a crossflow. A rib is applied to control the jet impingement heat transfer Liquid crystal technique is employed to measure the wall temperature and obtain the heat transfer coefficients. In the study, the Reynolds number for the crossflow is 80,000 and the Reynolds number for the jet ranges from 20,000 to 40,000. This gives rise to the jet-to-crossflow velocity ratio varying from 1.4 to 2.8. For all the tested cases, it is found that 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 ratio (R = 1.4). However, in such case, the local heat transfer in the rib corner region deteriorates. At higher velocity ratio, especially at 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},
  author       = {Wang, Lei and Sundén, Bengt and Borg, Andreas and Abrahamsson, Hans},
  isbn         = {978-0-7918-5465-5},
  language     = {eng},
  pages        = {1617--1624},
  publisher    = {ARRAY(0xd0a9ff0)},
  series       = {Proceedings of the Asme Turbo Expo 2011, Vol 5, Pts A and B},
  title        = {Heat Transfer in a Channel under Effects of a Shallow-Angle Jet Impingement and a Rib},
  url          = {http://dx.doi.org/10.1115/GT2011-46333},
  year         = {2012},
}