In a hydrodynamic unsteady environment macrofouling organism have to settle down and glue themselves on substrata that not give away under pressure. It is unclear, if Bingham flow of multiphase materials effectively promote the foul-release of such organisms from surfaces. Field experiments were conducted applying two different kinds of multiphase materials, vaseline and vaseline solder paste. The pastes were applied in a thin layer onto the jackets of towed seismic streamer cables or non-towed plates. The growth of macrofouling organisms were monitored on treated and untreated surfaces. The treatment stopped fouling independent from the chemical composition of the material applied, if the yield point of the coating material, tauyield, was higher than the wall shear stress at the surface of the coating (without biofoulers), tauwall, and lower than the expected additional hydrodynamic drag, tauextralaod , acting on the 'towed' marcofoulers, tauwall < tauyield < tauextraload. The results obtained indicate that the yield point of substrata is a substantial biomechanical cue in fouling control.
Developing effective, verifiably safe and environmentally compatible marine coatings: Foul-release performance and yield stress of pasty coatings
Entwicklung von wirksamen, nachweisbar sicheren und umweltverträglichen Schiffsbeschichtungen: Schmutzabweisungsleistung und Fließspannung von pastösen Beschichtungen
2007
18 Seiten, 3 Bilder, 28 Quellen
(+ 10 Folienseiten)
Aufsatz (Konferenz)
Englisch
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