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Article

Frictional Resistance of Antifouling Coating Systems

[+] Author and Article Information
Michael P. Schultz

Department of Naval Architecture and Ocean Engineering, United States Naval Academy, Annapolis, MD 21402

J. Fluids Eng 126(6), 1039-1047 (Mar 11, 2005) (9 pages) doi:10.1115/1.1845552 History: Received March 21, 2004; Revised June 12, 2004; Online March 11, 2005
Copyright © 2004 by ASME
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Figures

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Schematic of the flat plate test fixture
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Overall frictional resistance coefficient versus Reynolds number for all test surfaces in the unfouled condition. (Overall uncertainty in CF: ±2% at highest Reynolds number; ±5% at lowest Reynolds number.)
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Plan view of the surface waveform for (a) silicone 1 specimen; (b) Ablative copper specimen. (Overall uncertainty: y direction, ±1 μm; x and z directions, ±5 μm.)
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Wave-number spectra of the surface waveforms for silicone 1 and ablative copper
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Overall frictional resistance coefficient versus Reynolds number for all test surfaces in the fouled condition after 287 days exposure. (Overall uncertainty in CF: ±2% at highest Reynolds number; ±5% at lowest Reynolds number.)
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Overall frictional resistance coefficient versus Reynolds number for all test surfaces in the cleaned condition. (Overall uncertainty in CF: ±2% at highest Reynolds number; ±5% at lowest Reynolds number.)
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Roughness function for all test surfaces in the unfouled condition. [Overall uncertainty in ΔU+: ±6% or ±0.1 (whichever is larger) at highest Reynolds number; ±16% or ±0.2 (whichever is larger) at lowest Reynolds number.]
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Roughness function for the AF test surfaces in the unfouled condition. [Overall uncertainty in ΔU+: ±6% or ±0.1 (whichever is larger) at highest Reynolds number; ±16% or ±0.2 (whichever is larger) at lowest Reynolds number.]
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Roughness function for the AF test surfaces in the fouled condition after 287 days exposure. [Overall uncertainty in ΔU+: ±6% or ±0.1 (whichever is larger) at highest Reynolds number; ±16% or ±0.2 (whichever is larger) at lowest Reynolds number.]
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Roughness function for the AF test surfaces in the cleaned condition. [Overall uncertainty in ΔU+: ±6% or ±0.1 (whichever is larger) at highest Reynolds number; ±16% or ±0.2 (whichever is larger) at lowest Reynolds number.]
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Increase in CF at ship-scale (L=150 m) for the test surfaces in the unfouled, fouled, and cleaned conditions for U≈6.2 m/s (12 knots)

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