Effects of ‘in-service’ conditions–mimicked hull roughness ranges and biofilms–on the surface and the hydrodynamic characteristics of foul-release type coatings
Journal article, 2020

To develop a better understanding of ‘in-service’ performance of modern marine coatings, this study explored the combined effects of different roughness ranges of foul-release coating (FRC) and light biofouling (slime) on the surface, boundary layer and drag characteristics under a range of ‘in-service’ conditions. Natural and laboratory biofilms were grown dynamically on FRC panels by exposing panels in facilities dedicated to realistic fouling culture. The boundary layer experiments were conducted in a circulating water tunnel. Boundary layer similarity-law scaling was used to predict the combined effects of coating roughness and biofilms on the added frictional resistance (% (Formula presented.) and added required effective power (Formula presented.)) for a benchmark KRISO container ship (KCS) and a bulk carrier. The increase in (Formula presented.) due to the presence of biofilms on commercial FRC is estimated to be between 7% and 16% depending on the biofilm type, biofilm thickness and percentage coverage. Significant increases in effective power are estimated for non-fouling control primers with heavy fouling. Moreover, the paper suggests updated roughness allowances ((Formula presented.)) for two vessel types assuming FRCs on their hulls with more representative hull roughness ranges and fluffy biofilms.

biofilms

fouling

ship power penalties

skin friction drag

Coatings ‘in-service’ condition

Author

Irma Yeginbayeva

Chalmers, Mechanics and Maritime Sciences, Maritime Studies, Maritime Environmental Sciences

Mehmet Atlar

University of Strathclyde

Serkan Turkmen

Newcastle University

H. Chen

International Paint Singapore Pte Ltd

Biofouling

0892-7014 (ISSN) 1029-2454 (eISSN)

Vol. 36 9 1074-1089

Subject Categories

Tribology

Manufacturing, Surface and Joining Technology

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1080/08927014.2020.1855330

PubMed

33291985

More information

Latest update

1/5/2021 2