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An experimental study of heat transfer in the turn region of a U-bend channel with various ribs

Wang, Chenglong LU ; Wang, Lei LU and Sundén, Bengt LU (2014) 15th International Heat Transfer Conference, IHTC 2014 In Proceedings of the 15th International Heat Transfer Conference, IHTC 2014
Abstract

The detailed heat transfer distributions and pressure drop in the turn region of a U-bend channel with and without ribs have been experimentally investigated using liquid crystal thermography. The Reynolds numbers based on hydraulic diameter of the channel and the bulk velocity are 20,000 and 26,000. The ribs are mounted on the outer wall surface in the turn region of the U-bend channel; the rib height-to-hydraulic diameter ratio is 6%; the rib pitch-to-height ratio is 12; and the rib configurations studied are transverse (90°), angled (45°, 60°), and V-shaped (45°, 60°) with tip facing downstream and upstream. Results indicate that heat transfer on the smooth outer wall is dominated by the flow impingement. In the presence of ribs, the... (More)

The detailed heat transfer distributions and pressure drop in the turn region of a U-bend channel with and without ribs have been experimentally investigated using liquid crystal thermography. The Reynolds numbers based on hydraulic diameter of the channel and the bulk velocity are 20,000 and 26,000. The ribs are mounted on the outer wall surface in the turn region of the U-bend channel; the rib height-to-hydraulic diameter ratio is 6%; the rib pitch-to-height ratio is 12; and the rib configurations studied are transverse (90°), angled (45°, 60°), and V-shaped (45°, 60°) with tip facing downstream and upstream. Results indicate that heat transfer on the smooth outer wall is dominated by the flow impingement. In the presence of ribs, the heat transfer patterns are significantly altered due to the combined effects of the sharp turn and ribs. Based on the average heat transfer and pressure drop, thermal performance is evaluated and heat transfer non-uniformity is also considered to provide better rib configurations.

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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Blade-tip cooling, Gas turbine, Heat transfer enhancement, Liquid crystal thermography, U-bend channel
in
Proceedings of the 15th International Heat Transfer Conference, IHTC 2014
publisher
Begell House Inc.
conference name
15th International Heat Transfer Conference, IHTC 2014
external identifiers
  • scopus:84964533519
language
English
LU publication?
yes
id
df544a44-47bf-45a4-9e15-2dd10fa44131
date added to LUP
2016-10-19 14:12:41
date last changed
2017-03-19 04:36:31
@inproceedings{df544a44-47bf-45a4-9e15-2dd10fa44131,
  abstract     = {<p>The detailed heat transfer distributions and pressure drop in the turn region of a U-bend channel with and without ribs have been experimentally investigated using liquid crystal thermography. The Reynolds numbers based on hydraulic diameter of the channel and the bulk velocity are 20,000 and 26,000. The ribs are mounted on the outer wall surface in the turn region of the U-bend channel; the rib height-to-hydraulic diameter ratio is 6%; the rib pitch-to-height ratio is 12; and the rib configurations studied are transverse (90°), angled (45°, 60°), and V-shaped (45°, 60°) with tip facing downstream and upstream. Results indicate that heat transfer on the smooth outer wall is dominated by the flow impingement. In the presence of ribs, the heat transfer patterns are significantly altered due to the combined effects of the sharp turn and ribs. Based on the average heat transfer and pressure drop, thermal performance is evaluated and heat transfer non-uniformity is also considered to provide better rib configurations.</p>},
  author       = {Wang, Chenglong and Wang, Lei and Sundén, Bengt},
  booktitle    = {Proceedings of the 15th International Heat Transfer Conference, IHTC 2014},
  keyword      = {Blade-tip cooling,Gas turbine,Heat transfer enhancement,Liquid crystal thermography,U-bend channel},
  language     = {eng},
  publisher    = {Begell House Inc.},
  title        = {An experimental study of heat transfer in the turn region of a U-bend channel with various ribs},
  year         = {2014},
}