Experimental Investigation of Three-Dimensional Nonbuoyant Rectangular Jets
Publication: Journal of Engineering Mechanics
Volume 131, Issue 7
Abstract
The behavior of a nonbuoyant three-dimensional rectangular water jet with aspect ratios of 5, 10, and 20 were investigated based on experimental results of the mean velocity field obtained by particle image velocimetry. The theoretical centerline velocity equation derived from the point source concept using the spreading rate for the axisymmetric jet gave velocity results that agreed well with the measured centerline velocity, and provided the potential core region, two-dimensional region, and axisymmetric region. The similarities of the measured cross-sectional velocity profiles along both major and minor axes were verified. In the two-dimensional region, the Gaussian constant and Strouhal number tended to be preserved, and the spreading rate decreased at the end of the two-dimensional region. In the transition zone between the two-dimensional and the axisymmetric regions, the centerline velocity decay rate and the spreading rate were observed to drop, whereas the Gaussian constant and Strouhal number were found to increase with axial distance. The range of the two-dimensional region demarcated by the criterion of the theoretical centerline velocity decay was very similar to those based on the conservations of the Gaussian constant and Strouhal number, and that based on the change in the spreading rate along the minor axis.
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Acknowledgments
This research work was partially funded by 2000–2001 Research Fund No. UNSPECIFIED1999-2-309-004-3 of the Korea Science and Engineering Foundation and under the 2000–2001 Brain Korea project of the Ministry of Education in Korea. All research work in connection with this study was conducted at the Research Institute of Engineering Science of Seoul National University, Seoul, Korea.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 131 • Issue 7 • July 2005
Pages: 733 - 746
Copyright
© 2005 ASCE.
History
Received: Nov 13, 2003
Accepted: Dec 7, 2004
Published online: Jul 1, 2005
Published in print: Jul 2005
Notes
Note. Associate Editor: Joseph Hun-Wei Lee
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