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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
Authors/Creators:	Andrewartha, JM and Sargison, JE and Perkins, KJ
Keywords:	biofilm, biofouling, boundary layer, drag, hydroelectric, skin friction, water tunnel.
Journal or Publication Title:	WSEAS Transactions on Fluid Mechanics
ISSN:	1790-5087
Additional Information:	Open access article available at http://www.wseas.us/e-library/transactions/fluid/2008/MGR-01.pdf © 2008 WSEAS
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