DTIC ADA097228: Drag Enhancement of Microbial Slime pdf

DTIC ADA097228: Drag Enhancement of Microbial Slime

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Recent advances in anti-fouling technology have made control of macroscopic fouling organisms (barnacles, bryozoans and tubeworms) feasible. Among the limiting factors in fast ship performance in the absence of macrofouling are the hydrodynamic drag of hull coatings themselves, the drag increment caused by microbial fouling of hull coatings, and losses in propulsion efficiency resulting from microbial colonization of propellers. This work assesses the significance of microbial colonization of organic and metal surfaces for hydrodynamic drag over a wide range of flow velocities. Measurements made with a rotating disc apparatus at disc peripheral speeds from 9.5 to 33 Kn (17 to 61 Km/hr) showed that (a) microbial slime films can be grown which withstand testing at these velocities and (b) drag increments in excess of 10% are often observed. Therefore, because they are not eliminated by current antifoulants, microbial fouling films and their effects on ship performance warrant serious consideration.

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• Creator/s: Defense Technical Information Center
• Date: 3/27/1981
• Year: 1981
• Book Topics/Themes: DTIC Archive, Loeb, George I, NAVAL RESEARCH LAB WASHINGTON DC, *FILMS, *MICROORGANISMS, *ANTIFOULING, *SLIME, METALS, THICKNESS, BACTERIA, SURFACES, ORGANIC MATERIALS, DRAG, ANTIFOULING COATINGS, HYDRODYNAMICS, BARNACLES, MARINE PROPELLERS, SHIP HULLS, COLONIES(BIOLOGY), FOULING ORGANISMS, HYDRODYNAMIC CONTROL SURFACES, CHLORELLA, POLYCHAETA

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