Effects on endwall heat transfer by a winglet vortex generator pair mounted upstream of a cylinder
(2016) In Journal of Enhanced Heat Transfer 23(3). p.241-262- Abstract
The present study was conducted to investigate heat transfer enhancement from the endwall of a protruding circular cylinder by addition of a winglet vortex generator pair. A steady-state liquid crystal thermography technique was employed. The vortex generator pair is installed upstream of a cylinder placed either in counter flow inward or counter flow outward orientation. The vortex generator installed in the counter flow inward orientation presented the best heat transfer. The effects of the vortex generator attack angle on the junction wall heat transfer are also investigated and the 45° yaw angle with respect to the streamwise direction provided higher thermal performance. The position of the vortex generator with respect to the... (More)
The present study was conducted to investigate heat transfer enhancement from the endwall of a protruding circular cylinder by addition of a winglet vortex generator pair. A steady-state liquid crystal thermography technique was employed. The vortex generator pair is installed upstream of a cylinder placed either in counter flow inward or counter flow outward orientation. The vortex generator installed in the counter flow inward orientation presented the best heat transfer. The effects of the vortex generator attack angle on the junction wall heat transfer are also investigated and the 45° yaw angle with respect to the streamwise direction provided higher thermal performance. The position of the vortex generator with respect to the cylindrical obstacle is swapped in the streamwise and spanwise directions to find out the appropriate location of the vortex generator regarding enhancement of endwall heat transfer. The results indicated that the effect of the vortex generator in enhancing the endwall heat transfer is prominent in the spanwise direction rather than in the streamwise direction. Up to 25% heat transfer enhancement has been found with a pressure drop penalty of 4.8%, thus giving high thermal performance.
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- author
- Hussain, Safeer LU ; Liu, Jian LU ; Wang, Lei LU and Sunden, Bengt LU
- organization
- publishing date
- 2016-01-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Displaced enhancement, Passive enhancement, Single-phase convection, Turbulent flows
- in
- Journal of Enhanced Heat Transfer
- volume
- 23
- issue
- 3
- pages
- 22 pages
- publisher
- Begell House
- external identifiers
-
- scopus:85049415024
- ISSN
- 1065-5131
- DOI
- 10.1615/JEnhHeatTransf.2017020823
- language
- English
- LU publication?
- yes
- id
- 59035c45-4023-4e12-8225-8e191dfbf173
- date added to LUP
- 2018-07-19 12:14:45
- date last changed
- 2022-04-25 08:13:20
@article{59035c45-4023-4e12-8225-8e191dfbf173,
abstract = {{<p>The present study was conducted to investigate heat transfer enhancement from the endwall of a protruding circular cylinder by addition of a winglet vortex generator pair. A steady-state liquid crystal thermography technique was employed. The vortex generator pair is installed upstream of a cylinder placed either in counter flow inward or counter flow outward orientation. The vortex generator installed in the counter flow inward orientation presented the best heat transfer. The effects of the vortex generator attack angle on the junction wall heat transfer are also investigated and the 45° yaw angle with respect to the streamwise direction provided higher thermal performance. The position of the vortex generator with respect to the cylindrical obstacle is swapped in the streamwise and spanwise directions to find out the appropriate location of the vortex generator regarding enhancement of endwall heat transfer. The results indicated that the effect of the vortex generator in enhancing the endwall heat transfer is prominent in the spanwise direction rather than in the streamwise direction. Up to 25% heat transfer enhancement has been found with a pressure drop penalty of 4.8%, thus giving high thermal performance.</p>}},
author = {{Hussain, Safeer and Liu, Jian and Wang, Lei and Sunden, Bengt}},
issn = {{1065-5131}},
keywords = {{Displaced enhancement; Passive enhancement; Single-phase convection; Turbulent flows}},
language = {{eng}},
month = {{01}},
number = {{3}},
pages = {{241--262}},
publisher = {{Begell House}},
series = {{Journal of Enhanced Heat Transfer}},
title = {{Effects on endwall heat transfer by a winglet vortex generator pair mounted upstream of a cylinder}},
url = {{http://dx.doi.org/10.1615/JEnhHeatTransf.2017020823}},
doi = {{10.1615/JEnhHeatTransf.2017020823}},
volume = {{23}},
year = {{2016}},
}