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Effects of ‘in-service’ conditions – mimicked hull roughness ranges and biofilms – on the surface and the hydrodynamic characteristics of foulrelease type coatings

Lookup NU author(s): Irma Yeginbayeva, Professor Mehmet Atlar, Dr Serkan TurkmenORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).

Abstract

To develop a better understanding of ‘in-service’ performance of modern marine coatings, thisstudy 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 arange of ‘in-service’ conditions. Natural and laboratory biofilms were grown dynamically on FRCpanels by exposing panels in facilities dedicated to realistic fouling culture. The boundary layerexperiments were conducted in a circulating water tunnel. Boundary layer similarity-law scalingwas used to predict the combined effects of coating roughness and biofilms on the added frictionalresistance (%DCFÞ and added required effective power ð%DPE) for a benchmark KRISOcontainer ship (KCS) and a bulk carrier. The increase in %DPE due to the presence of biofilmson 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 estimatedfor non-fouling control primers with heavy fouling. Moreover, the paper suggestsupdated roughness allowances (DCF ) for two vessel types assuming FRCs on their hulls withmore representative hull roughness ranges and fluffy biofilms.

Publication metadata

Author(s): Yeginbayeva I, Atlar M, Turkmen S, Chen H

Publication type: Article

Publication status: Published

Journal: Biofouling

Year: 2020

Volume: 36

Issue: 9

Pages: 1074-1089

Online publication date: 08/12/2020

Acceptance date: 18/11/2020

Date deposited: 04/01/2021

ISSN (print): 0892-7014

ISSN (electronic): 1029-2454

Publisher: Taylor & Francis

URL: https://doi.org/10.1080/08927014.2020.1855330

DOI: 10.1080/08927014.2020.1855330

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