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Skin-friction drag measurements on ship hull coating systems
conference contribution
posted on 2023-05-23, 09:31 authored by Walker, JM, Schultz, MP, Flack, KA, Steppe, CNSkin-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.
History
Publication title
Proceedings of the Thirtieth Symposium on Naval HydrodynamicsEditors
P Brandner, BW Pearce, & KH KimPagination
1-10ISBN
978-1-86295-850-0Department/School
Australian Maritime CollegePublisher
Office of Naval Research Science and TechnologyPlace of publication
TasmaniaEvent title
30th Symposium on Naval HydrodynamicsEvent Venue
Hobart, TasmaniaDate of Event (Start Date)
2014-11-02Date of Event (End Date)
2014-11-07Rights statement
Copyright unknownRepository Status
- Restricted