Mass Transport in Shallow Turbulent Wake Flow by Planar Concentration Analysis Technique
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 4
Abstract
A planar concentration analysis (PCA) system is used for observing the transport and mixing of a tracer mass in a shallow turbulent free-surface wake flow of a large cylindrical obstacle. The nonintrusive, fieldwise PCA measuring technique is applied to evaluate depth-averaged mass concentrations by making use of light attenuation due to absorption and scattering processes related to a dissolved tracer mass. The scalar fields are decomposed into a low-frequency quasiperiodic part, the coherent flow, and a randomly fluctuating part. From accompanying near-surface velocity measurements, large-scale coherent structures are identified and related to the coherent mass fields. This allows one to assess the role of the large-scale vortices for advection and diffusion in shallow wake flows. The time–mean wake flow displays a self-similar spanwise distribution both for mass and velocity. The longitudinal development of shallow wakes initially shows the growth of unbounded wakes; in the wake far field an attenuated behavior applies.
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Acknowledgments
The PCA was developed and applied to shallow cylinder wakes at the shallow flow test facility of the Institute for Hydromechanics, University of Karlsruhe, Germany. The writers are indebted to their colleagues of the environmental fluid mechanics group for technical support and inspiring discussion. Financial support provided by the German Research Foundation (DFG Grant Nos. Ji 18/4 and Ji 18/8) is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 4 • April 2009
Pages: 257 - 270
Copyright
© 2009 ASCE.
History
Received: Apr 12, 2007
Accepted: Oct 8, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
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