Swirl and buoyancy effects on mixing performance of baffle-plate-type miniature confined multijet

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Title Swirl and buoyancy effects on mixing performance of baffle-plate-type miniature confined multijet
Author Tatsumi, Kazuya; Tanaka, Miyako; Woodfield, Peter; Nakabe, Kazuyoshi
Journal Name International Journal of Heat and Fluid Flow
Editor T. B. Gatski, N. Kasagi, B. E. Launder
Year Published 2010
Place of publication United States
Publisher Elsevier
Abstract A three-dimensional numerical simulation was carried out to examine the effects of swirl and buoyancy-driven flows on the mixing performance of a baffle-plate-type miniature confined multijet. Swirl flow was produced by inclining the jet nozzles surrounding the central jet in the circumferential direction. The results obtained were compared with those of the non-swirl case. The swirl flow interrupted the radial secondary flow generated in the region adjacent to the baffle plate. This interruption decreased the size of the reverse flow region, resulting in a deterioration of the mixing performance. This behavior was more noticeable in the case of a large swirl number. During the study of the buoyancy effect, the operating direction of the gravitational force was changed with respect to the central axis of the mixing chamber, i.e. the attack angles were 0°, 90° and 180°. The buoyancy effect was negligible when the operating direction was parallel to the chamber axis. However, when the attack angle was 90°, asymmetric distributions of mixture fraction and flow velocity were obtained, and the mixing performance was found to be poor. In the swirl-accompanied cases, the effect of buoyancy force was apparent even when the operating direction was parallel to the central axis. The swirl flow, which reduced the secondary flow effects of the reverse and radial flows, tended to increase the effect of the buoyancy force on the multijet flow. On the other hand, the swirl flow prevented the mixture fraction distribution to be asymmetric in the case of buoyancy with 90° attack angle. These tendencies became more conspicuous for flows with stronger swirl.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.ijheatfluidflow.2009.09.005
Volume 31
Issue Number 1
Page from 45
Page to 56
ISSN 0142-727X
Date Accessioned 2010-10-20
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Energy Generation, Conversion and Storage Engineering
URI http://hdl.handle.net/10072/36130
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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