Thermal and flow field characteristics in a rectangular duct with broken V-shaped ribs
(2003) ASME Summer Heat Transfer Conference (HT2003), 2003 2003. p.637-643- Abstract
- In the present study, the thermal and hydraulic characteristics of a rectangular duct with aspect ratio of 1/8 roughened by broken V-shaped ribs pointing upstream are investigated experimentally using Liquid Crystal Thermography (LCT) and Particle Image Velocimetry (PIV). The heat transfer distributions on the roughened wall were evaluated using liquid crystal images. It was found that the heat transfer coefficient had a spanwise variation on the ribbed wall, with high heat transfer coefficient at the upstream end of the rib and low value at the other end, similar to the continuous V-shaped ribs. However, the heat transfer distribution in the case of broken V-shaped ribs was observed more uniform, with local maxima due to the gap flow. In... (More)
- In the present study, the thermal and hydraulic characteristics of a rectangular duct with aspect ratio of 1/8 roughened by broken V-shaped ribs pointing upstream are investigated experimentally using Liquid Crystal Thermography (LCT) and Particle Image Velocimetry (PIV). The heat transfer distributions on the roughened wall were evaluated using liquid crystal images. It was found that the heat transfer coefficient had a spanwise variation on the ribbed wall, with high heat transfer coefficient at the upstream end of the rib and low value at the other end, similar to the continuous V-shaped ribs. However, the heat transfer distribution in the case of broken V-shaped ribs was observed more uniform, with local maxima due to the gap flow. In addition, the saw-tooth fashion of heat transfer distribution was also observed along the streamwise direction. The isothermal flow field measurements were obtained by PIV to catch the flow structures introduced by the ribs. The spanwise profile of the main flow velocity was found altered, and a complicated secondary flow was detected over the cross section. This flow phenomenon was caused by the ribs and the gaps between ribs. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/612351
- author
- Wang, Lieke LU ; Gao, Xiufang LU and Sundén, Bengt LU
- organization
- publishing date
- 2003
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Liquid crystal thermography (LCT), Particle image velocimetry (PIV)
- host publication
- Proceedings of the ASME Summer Heat Transfer Conference
- volume
- 2003
- pages
- 637 - 643
- publisher
- American Society Of Mechanical Engineers (ASME)
- conference name
- ASME Summer Heat Transfer Conference (HT2003), 2003
- conference location
- Las Vegas, NV, United States
- conference dates
- 2003-07-21 - 2003-07-23
- external identifiers
-
- scopus:1842679166
- ISBN
- 0791836932
- language
- English
- LU publication?
- yes
- id
- 2b35f120-fe73-4770-8327-be419beab84b (old id 612351)
- date added to LUP
- 2016-04-04 11:35:34
- date last changed
- 2022-02-21 05:00:18
@inproceedings{2b35f120-fe73-4770-8327-be419beab84b,
abstract = {{In the present study, the thermal and hydraulic characteristics of a rectangular duct with aspect ratio of 1/8 roughened by broken V-shaped ribs pointing upstream are investigated experimentally using Liquid Crystal Thermography (LCT) and Particle Image Velocimetry (PIV). The heat transfer distributions on the roughened wall were evaluated using liquid crystal images. It was found that the heat transfer coefficient had a spanwise variation on the ribbed wall, with high heat transfer coefficient at the upstream end of the rib and low value at the other end, similar to the continuous V-shaped ribs. However, the heat transfer distribution in the case of broken V-shaped ribs was observed more uniform, with local maxima due to the gap flow. In addition, the saw-tooth fashion of heat transfer distribution was also observed along the streamwise direction. The isothermal flow field measurements were obtained by PIV to catch the flow structures introduced by the ribs. The spanwise profile of the main flow velocity was found altered, and a complicated secondary flow was detected over the cross section. This flow phenomenon was caused by the ribs and the gaps between ribs.}},
author = {{Wang, Lieke and Gao, Xiufang and Sundén, Bengt}},
booktitle = {{Proceedings of the ASME Summer Heat Transfer Conference}},
isbn = {{0791836932}},
keywords = {{Liquid crystal thermography (LCT); Particle image velocimetry (PIV)}},
language = {{eng}},
pages = {{637--643}},
publisher = {{American Society Of Mechanical Engineers (ASME)}},
title = {{Thermal and flow field characteristics in a rectangular duct with broken V-shaped ribs}},
volume = {{2003}},
year = {{2003}},
}