Mixing in circular and non-circular jets in crossflow
(2008) In Flow, Turbulence and Combustion 80(2). p.255-283- Abstract
- Coherent structures and mixing in the flow field of a jet in crossflow have been studied using computational (large eddy simulation) and experimental (particle image velocimetry and laser-induced fluorescence) techniques. The mean scalar fields and turbulence statistics as determined by both are compared for circular, elliptic, and square nozzles. For the latter configurations, effects of orientation are considered. The computations reveal that the distribution of a passive scalar in a cross-sectional plane can be single- or double-peaked, depending on the nozzle shape and orientation. A proper orthogonal decomposition of the transverse velocity indicates that coherent structures may be responsible for this phenomenon. Nozzles which have a... (More)
- Coherent structures and mixing in the flow field of a jet in crossflow have been studied using computational (large eddy simulation) and experimental (particle image velocimetry and laser-induced fluorescence) techniques. The mean scalar fields and turbulence statistics as determined by both are compared for circular, elliptic, and square nozzles. For the latter configurations, effects of orientation are considered. The computations reveal that the distribution of a passive scalar in a cross-sectional plane can be single- or double-peaked, depending on the nozzle shape and orientation. A proper orthogonal decomposition of the transverse velocity indicates that coherent structures may be responsible for this phenomenon. Nozzles which have a single-peaked distribution have stronger modes in transverse direction. The global mixing performance is superior for these nozzle types. This is the case for the blunt square nozzle and for the elliptic nozzle with high aspect ratio. It is further demonstrated that the flow field contains large regions in which a passive scalar is transported up the mean gradient (counter-gradient transport) which implies failure of the gradient diffusion hypothesis. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1198720
- author
- Salewski, Mirko LU ; Stankovic, Dragan LU and Fuchs, Laszlo LU
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- mixing, jet in crossflow, transverse jet, nozzle, shape, coherent structures
- in
- Flow, Turbulence and Combustion
- volume
- 80
- issue
- 2
- pages
- 255 - 283
- publisher
- Springer
- external identifiers
-
- wos:000252942900005
- scopus:39149094625
- ISSN
- 1573-1987
- DOI
- 10.1007/s10494-007-9119-x
- language
- English
- LU publication?
- yes
- id
- 771ceb58-194d-437e-bbb5-5a288e306b8e (old id 1198720)
- date added to LUP
- 2016-04-01 11:44:54
- date last changed
- 2022-03-13 00:06:44
@article{771ceb58-194d-437e-bbb5-5a288e306b8e,
abstract = {{Coherent structures and mixing in the flow field of a jet in crossflow have been studied using computational (large eddy simulation) and experimental (particle image velocimetry and laser-induced fluorescence) techniques. The mean scalar fields and turbulence statistics as determined by both are compared for circular, elliptic, and square nozzles. For the latter configurations, effects of orientation are considered. The computations reveal that the distribution of a passive scalar in a cross-sectional plane can be single- or double-peaked, depending on the nozzle shape and orientation. A proper orthogonal decomposition of the transverse velocity indicates that coherent structures may be responsible for this phenomenon. Nozzles which have a single-peaked distribution have stronger modes in transverse direction. The global mixing performance is superior for these nozzle types. This is the case for the blunt square nozzle and for the elliptic nozzle with high aspect ratio. It is further demonstrated that the flow field contains large regions in which a passive scalar is transported up the mean gradient (counter-gradient transport) which implies failure of the gradient diffusion hypothesis.}},
author = {{Salewski, Mirko and Stankovic, Dragan and Fuchs, Laszlo}},
issn = {{1573-1987}},
keywords = {{mixing; jet in crossflow; transverse jet; nozzle; shape; coherent structures}},
language = {{eng}},
number = {{2}},
pages = {{255--283}},
publisher = {{Springer}},
series = {{Flow, Turbulence and Combustion}},
title = {{Mixing in circular and non-circular jets in crossflow}},
url = {{https://lup.lub.lu.se/search/files/2623863/1446179.pdf}},
doi = {{10.1007/s10494-007-9119-x}},
volume = {{80}},
year = {{2008}},
}