| Trajectory measurements of a wall jet impinging onto a forward facing step entering a cross-flow. | |
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MedLine Citation:
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PMID: 20005038 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study examines a horizontal wall jet impinging onto a forward facing step in a cross-flow. Planar laser induced fluorescence (PLIF) experiments in a water channel indicate that the wall-jet flow after impinging onto the step, becomes a vertical jet with an elliptical cross section. Experiments indicate that the jet trajectory scales with the perimeter of the elliptical jet issuing vertically into the cross-flow. The trajectory consists of three regions: the near-field region which is well described by a power law with an exponent of 1/2, the mid-field region where the jet is fully bent over which is described by a power law with an exponent of 1/3, and a far-field region where the jet is dominated by the cross-flow. This paper provides a prediction of the plume behaviour based on the geometric and initial conditions of the jet (diameter, step height, distance from jet to step, and velocity ratio) alone. The Briggs entrainment model for a round jet was also used to predict the trajectories of the jet in the cross-flow. It was found that the entrainment coefficients, alpha and beta, for the elliptical jet case had average values of 0.15 and 0.58 respectively. |
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Authors:
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D C Langer; B A Fleck; D J Wilson |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-12-11 |
Journal Detail:
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Title: Journal of hazardous materials Volume: 176 ISSN: 1873-3336 ISO Abbreviation: J. Hazard. Mater. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-02-01 Completed Date: 2010-05-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9422688 Medline TA: J Hazard Mater Country: Netherlands |
Other Details:
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Languages: eng Pagination: 199-206 Citation Subset: IM |
Copyright Information:
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2009 Elsevier B.V. All rights reserved. |
Affiliation:
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Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Physical Processes Rheology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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