Advanced

A novel control of jet impingement heat transfer in cross-flow by a vortex generator pair

Wang, Chenglong LU ; Wang, Lei LU and Sundén, Bengt LU (2015) In International Journal of Heat and Mass Transfer 88. p.82-90
Abstract
Jet impingement is an effective heat transfer method while the favorable performance is usually degraded by the cross-flow. In this article, a novel control of the impinging jet in cross-flow has been proposed. A delta winglet vortex generator pair (VGP) is installed in the cross-flow channel upstream of the jet nozzle. The jet and the cross-flow Reynolds numbers are 15,000 and 40,000, respectively. The ratio of nozzle-to-surface distance to jet diameter is 4.0. Experimental measurements are conducted to study the characteristics of heat transfer with liquid crystal thermography (LCT). Results indicate that the VGP with common-flow-up (CFU) configuration promotes the jet penetration in cross-flow and augments the impingement heat transfer... (More)
Jet impingement is an effective heat transfer method while the favorable performance is usually degraded by the cross-flow. In this article, a novel control of the impinging jet in cross-flow has been proposed. A delta winglet vortex generator pair (VGP) is installed in the cross-flow channel upstream of the jet nozzle. The jet and the cross-flow Reynolds numbers are 15,000 and 40,000, respectively. The ratio of nozzle-to-surface distance to jet diameter is 4.0. Experimental measurements are conducted to study the characteristics of heat transfer with liquid crystal thermography (LCT). Results indicate that the VGP with common-flow-up (CFU) configuration promotes the jet penetration in cross-flow and augments the impingement heat transfer greatly on the target wall compared to the baseline case without the VGP. In addition, the enhancement increases monotonically with the angle of attack of the VGP varying from alpha = 150 degrees to 45. The spacing between the VGP l(1) = 1.2d is preferred with the highest heat transfer augmentation of jet impingement among l(1) = 0.5-2.0d. The optimal value of spacing between the VGP and the jet nozzle 12 is suggested to be 4d in terms of enhancing the heat transfer, for the measurement range from l(2) = 2d to l(2) = 8d. The VGP with common-flow-down (CFD) configuration is also tested, but it leads to slightly lower heat transfer than without the VGP. Pressure drop of the jet in cross-flow with VGP is measured and analyzed. (C) 2015 Elsevier Ltd. All rights reserved. (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
Jet impingement, Cross-flow, Heat transfer control, Vortex generator, pair
in
International Journal of Heat and Mass Transfer
volume
88
pages
82 - 90
publisher
Pergamon
external identifiers
  • wos:000364802600008
  • scopus:84928986861
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2015.04.056
language
English
LU publication?
yes
id
18824169-f361-4abc-b1f2-732279a3530c (old id 8539774)
date added to LUP
2016-01-20 11:13:03
date last changed
2017-10-22 03:21:42
@article{18824169-f361-4abc-b1f2-732279a3530c,
  abstract     = {Jet impingement is an effective heat transfer method while the favorable performance is usually degraded by the cross-flow. In this article, a novel control of the impinging jet in cross-flow has been proposed. A delta winglet vortex generator pair (VGP) is installed in the cross-flow channel upstream of the jet nozzle. The jet and the cross-flow Reynolds numbers are 15,000 and 40,000, respectively. The ratio of nozzle-to-surface distance to jet diameter is 4.0. Experimental measurements are conducted to study the characteristics of heat transfer with liquid crystal thermography (LCT). Results indicate that the VGP with common-flow-up (CFU) configuration promotes the jet penetration in cross-flow and augments the impingement heat transfer greatly on the target wall compared to the baseline case without the VGP. In addition, the enhancement increases monotonically with the angle of attack of the VGP varying from alpha = 150 degrees to 45. The spacing between the VGP l(1) = 1.2d is preferred with the highest heat transfer augmentation of jet impingement among l(1) = 0.5-2.0d. The optimal value of spacing between the VGP and the jet nozzle 12 is suggested to be 4d in terms of enhancing the heat transfer, for the measurement range from l(2) = 2d to l(2) = 8d. The VGP with common-flow-down (CFD) configuration is also tested, but it leads to slightly lower heat transfer than without the VGP. Pressure drop of the jet in cross-flow with VGP is measured and analyzed. (C) 2015 Elsevier Ltd. All rights reserved.},
  author       = {Wang, Chenglong and Wang, Lei and Sundén, Bengt},
  issn         = {0017-9310},
  keyword      = {Jet impingement,Cross-flow,Heat transfer control,Vortex generator,pair},
  language     = {eng},
  pages        = {82--90},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {A novel control of jet impingement heat transfer in cross-flow by a vortex generator pair},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.04.056},
  volume       = {88},
  year         = {2015},
}