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The influence of freshwater biofilms on drag in hydroelectric power schemes

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Andrewartha, JM and Sargison, JE and Perkins, KJ (2008) The influence of freshwater biofilms on drag in hydroelectric power schemes. WSEAS Transactions on Fluid Mechanics, 3 (3). pp. 201-206. ISSN 1790-5087

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Abstract

Freshwater biofilms are currently being studied to determine their effect on the capacity of hydroelectric power scheme canals and the structure of their turbulent wall layers. Mean velocity boundary layer profiles and total drag measurements have been conducted in a purpose built recirculating water tunnel on freshwater biofilms grown in a hydroelectric canal. Two different fouled surfaces were compared with a smooth painted surface to determine the effects of the physical characteristics of a biofilm on skin friction drag. A 310% increase in local skin friction coefficient was measured for a biofilm dominated by long filamentous algae streamers, and a 50% increase was measured for a biofilm dominated by a low-form gelatinous diatom.

Item Type: Article
Keywords: biofilm, biofouling, boundary layer, drag, hydroelectric, skin friction, water tunnel.
Journal or Publication Title: WSEAS Transactions on Fluid Mechanics
Page Range: pp. 201-206
ISSN: 1790-5087
Additional Information: Open access article available at http://www.wseas.us/e-library/transactions/fluid/2008/MGR-01.pdf © 2008 WSEAS
Date Deposited: 21 Jul 2009 05:20
Last Modified: 18 Nov 2014 04:03
URI: http://eprints.utas.edu.au/id/eprint/8941
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