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Experimental Investigation of Flow Field Structure in Mixing Tee

Hosseini, Seyed Mohammad LU ; Yuki, Kazuhisa and Hashizume, Hidetoshi (2009) 5th Joint ASME/JSME Fluids Engineering Summer Conference In Journal Of Fluids Engineering-Transactions Of The Asme 131(5).
Abstract
T-junction is one of the familiar components in the cooling system of power plants with enormous capability of high-cycle thermal fatigue. This research investigates the structure and mixing mechanism of turbulent flow in a T-junction area with a 90 deg bend upstream. According to the wide distribution of turbulent jets in the T-junction, a re-attached jet was selected previously as the best representative condition with the highest velocity fluctuation and the most complex structure. For considering the mixing mechanism of re-attached jet, T-junction is subdivided into few lateral and longitudinal sections, and each section is visualized separately by particle image velocimetry technique. Corresponding to the experimental data, the branch... (More)
T-junction is one of the familiar components in the cooling system of power plants with enormous capability of high-cycle thermal fatigue. This research investigates the structure and mixing mechanism of turbulent flow in a T-junction area with a 90 deg bend upstream. According to the wide distribution of turbulent jets in the T-junction, a re-attached jet was selected previously as the best representative condition with the highest velocity fluctuation and the most complex structure. For considering the mixing mechanism of re-attached jet, T-junction is subdivided into few lateral and longitudinal sections, and each section is visualized separately by particle image velocimetry technique. Corresponding to the experimental data, the branch flow acts as a finite turbulent jet, develops the alternative type of eddies, and causes the high velocity fluctuation near the main pipe wall. Three regions are mainly subject to maximum velocity fluctuation: the region close to the jet boundaries (fluctuation mostly is caused by Kelvin-Helmholtz instability), the region above the jet and along the main flow (fluctuation mostly is caused by Karman vortex), and the re-attached area (fluctuation mostly is caused by changing the pressure gradient in the wake area above the jet). Finally, the re-attached area (near the downstream of wake area above the jet) is introduced as a region with strongest possibility to high-cycle thermal fatigue with most effective velocity fluctuation on the main pipe wall above the branch nozzle. [DOI: 10.1115/1.3112383] (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
PIV, fluid mixing structure and interaction, mixing tee, piping system, turbulent flow
in
Journal Of Fluids Engineering-Transactions Of The Asme
volume
131
issue
5
publisher
American Society Of Mechanical Engineers (ASME)
conference name
5th Joint ASME/JSME Fluids Engineering Summer Conference
external identifiers
  • wos:000265485900003
  • scopus:77955288886
ISSN
0098-2202
DOI
10.1115/1.3112383
language
English
LU publication?
yes
id
aa0b95d5-03fb-491b-a096-9e7c60c79d50 (old id 1427915)
date added to LUP
2009-06-25 14:27:44
date last changed
2017-09-03 04:25:32
@inproceedings{aa0b95d5-03fb-491b-a096-9e7c60c79d50,
  abstract     = {T-junction is one of the familiar components in the cooling system of power plants with enormous capability of high-cycle thermal fatigue. This research investigates the structure and mixing mechanism of turbulent flow in a T-junction area with a 90 deg bend upstream. According to the wide distribution of turbulent jets in the T-junction, a re-attached jet was selected previously as the best representative condition with the highest velocity fluctuation and the most complex structure. For considering the mixing mechanism of re-attached jet, T-junction is subdivided into few lateral and longitudinal sections, and each section is visualized separately by particle image velocimetry technique. Corresponding to the experimental data, the branch flow acts as a finite turbulent jet, develops the alternative type of eddies, and causes the high velocity fluctuation near the main pipe wall. Three regions are mainly subject to maximum velocity fluctuation: the region close to the jet boundaries (fluctuation mostly is caused by Kelvin-Helmholtz instability), the region above the jet and along the main flow (fluctuation mostly is caused by Karman vortex), and the re-attached area (fluctuation mostly is caused by changing the pressure gradient in the wake area above the jet). Finally, the re-attached area (near the downstream of wake area above the jet) is introduced as a region with strongest possibility to high-cycle thermal fatigue with most effective velocity fluctuation on the main pipe wall above the branch nozzle. [DOI: 10.1115/1.3112383]},
  author       = {Hosseini, Seyed Mohammad and Yuki, Kazuhisa and Hashizume, Hidetoshi},
  booktitle    = {Journal Of Fluids Engineering-Transactions Of The Asme},
  issn         = {0098-2202},
  keyword      = {PIV,fluid mixing structure and interaction,mixing tee,piping system,turbulent flow},
  language     = {eng},
  number       = {5},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Experimental Investigation of Flow Field Structure in Mixing Tee},
  url          = {http://dx.doi.org/10.1115/1.3112383},
  volume       = {131},
  year         = {2009},
}