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Turbulence and Mean-Velocity Structure of Flows over Filamentous Biofilms
Citation
Andrewartha, JM and Sargison, JE, Turbulence and Mean-Velocity Structure of Flows over Filamentous Biofilms, Proceedings of the 34th IAHR World Congress, 26 June -1 July 2011, Brisbane, Australia, pp. 2225-2232. ISBN 978-0-85825-868-6 (2011) [Refereed Conference Paper]
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Copyright Statement
Copyright 2011 IAHR
Official URL: http://www.iahr2011.org/publications.html
Abstract
The growth of biofilms on ships and the walls of conduits causes drag penalties due to the
increase in surface friction between the flow and the surface. Natural freshwater biofilms exist in
different forms, including soft gelatinous slimes and filamentous streamers. The effect of filamentous
biofilms on the physics of the flow and associated increases in drag was examined by developing an
idealised biofilm consisting of artificial streamers, designed to mimic the filamentous component of
naturally occurring biofilms. Changes to the flow structure were investigated using test plates inserted
in a water tunnel fitted with a two-dimensional Laser Doppler Velocimetry system to obtain mean
velocity and turbulence boundary layer profiles. Significant changes to the turbulence intensity and
turbulent Reynolds stresses were measured over the entire boundary layer. The streamers also
caused a thickening of the boundary layer, a 23% increase in local skin friction coefficient and
increased wake strength.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | Biofilm, boundary layer, drag, streamer, turbulence |
Research Division: | Engineering |
Research Group: | Fluid mechanics and thermal engineering |
Research Field: | Turbulent flows |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in engineering |
UTAS Author: | Andrewartha, JM (Dr Jessica Walker) |
UTAS Author: | Sargison, JE (Dr Jane Sargison) |
ID Code: | 76555 |
Year Published: | 2011 |
Deposited By: | Engineering |
Deposited On: | 2012-03-07 |
Last Modified: | 2014-08-28 |
Downloads: | 6 View Download Statistics |
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