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Skin-friction drag measurements on ship hull coating systems

Citation

Walker, JM and Schultz, MP and Flack, KA and Steppe, CN, Skin-friction drag measurements on ship hull coating systems, Proceedings of the Thirtieth Symposium on Naval Hydrodynamics, 2-7 November 2014, Hobart, Tasmania, pp. 1-10. ISBN 978-1-86295-850-0 (2014) [Refereed Conference Paper]


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Abstract

Skin-friction results are presented for both antifouling and fouling-release hull coatings. The tests were conducted in a fully-developed turbulent channel flow over a large Reynolds number range. The data show that the skin-friction on the fouling-release surfaces is lower than for the antifouling surfaces due to differences in surface topography. This is also observed to lead to significant changes in the roughness function shape for the two coating types. Nonetheless, departure from the hydraulically-smooth condition is observed to occur at a similar roughness Reynolds number based on the peak-to-trough roughness height for both coating types. Scale up of the present results predicts that a mid-sized Naval surface combatant coated with the fouling-release coatings are hydraulically-smooth or nearly so over their entire speed range. The same ship coated with the antifouling coatings is predicted to see an increase in frictional drag of 2-3% compared to the smooth condition. Preliminary measurements on a control surface covered with a 200-m thick biofilm show a much larger effect.

Item Details

Item Type:Refereed Conference Paper
Keywords:Biofouling, Surface Coating, Roughness, Antifouling, Skin Friction
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Defence
Objective Group:Defence
Objective Field:Navy
Author:Walker, JM (Dr Jessica Walker)
ID Code:96779
Year Published:2014
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2014-11-20
Last Modified:2017-03-09
Downloads:2 View Download Statistics

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