Experimental Investigation of Flow Field Structure in Mixing Tee
(2009) 5th Joint ASME/JSME Fluids Engineering Summer Conference 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:
https://lup.lub.lu.se/record/1427915
- author
- Hosseini, Seyed Mohammad LU ; Yuki, Kazuhisa and Hashizume, Hidetoshi
- organization
- publishing date
- 2009
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- PIV, fluid mixing structure and interaction, mixing tee, piping system, turbulent flow
- host publication
- 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
- conference dates
- 2007-07-30 - 2007-08-02
- 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
- 2016-04-01 15:04:45
- date last changed
- 2022-01-28 03:59:43
@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}},
keywords = {{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}},
doi = {{10.1115/1.3112383}},
volume = {{131}},
year = {{2009}},
}