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Abstract

A floating force balance has been designed and integrated into
the working section of a recirculating water tunnel to enable the
measurement of total drag on test plates, which form part of the
tunnel wall.
Measurements completed include a calibration of the rig using a
smooth acrylic plate, a smooth painted plate, and an artificially
roughened plate. The painted plate and rough plate have also
been studied with biofilms attached to their surface. The water
tunnel and total drag rig have been built specifically to allow the
detailed investigation of freshwater biofilm effects have on the
flow through hydraulic conduits.
Calibration results show that useful information can be obtained
by using the force balance, particularly in association with other
measurement techniques. Research into the effects of biofilms
showsthat large increases in friction and effective roughness can
be expected.

Item Type:	Conference or Workshop Item (Paper)
Authors/Creators:	Barton, AF and Sargison, JE and Brandner, PA and Walker, GJ
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