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Lookup NU author(s): Dr Chang LiORCiD, Professor Mehmet Atlar, Dr Maryam HaroutunianORCiD, Dr Serkan TurkmenORCiD
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
Copper and copper compounds are commonly used as biocides against biofouling on surfaces exposed to seawater. Copper oxide, one of the most commonly used forms of copper biocide, can provide an efficient mechanism for fouling-free surfaces, resulting in substantial fuel savings and reduction of Greenhouse Gases (GHG) emissions. However, copper oxide is commercially formulated with different particle sizes, which can consequently lead to surfaces with different roughness conditions. The roughness effect of various sizes of copper oxide particles on the drag performance of antifouling coatings, and hence on the ship hull drag, has not been systematically studied in the past. Therefore, to investigate the effect of particle sizes on antifouling roughness and hydrodynamic characteristics, a number of different sized cuprous oxide pigments (with median size ranging from 2µm to 250µm) were applied on Newcastle University’s (UNEW) standard acrylic flat test panels. Roughness characteristics were analysed by using an optical surface profilometer. Moreover, the microstructure observations of all test specimens were carried out using Scanning Electron Microscopy (SEM). Subsequently, a laboratory experiment of streamwise pressure drop measurements was conducted on all coated plates and compared to uncoated acrylic control panels. The Reynolds number for the experiment, based on bulk mean velocity and channel height, ranged from 3×104 to 1.6×105. Analysis indicated that for the panels coated with particle sizes ≥12µm , the roughness characteristics and frictional drag increased as particle size increased. Interestingly, due to particle agglomeration and surface finish condition, those panels coated with particle sizes <12µm were found not follow this trend and had higher roughness and drag characteristics than expected.Copper oxide, antifouling, roughness characteristic, frictional drag, pressure drop measurement, roughness function
Author(s): Li C, Atlar M, Haroutunian M, Anderson C, Turkmen S
Publication type: Article
Publication status: Published
Journal: Ocean Engineering
Year: 2018
Volume: 159
Pages: 481-495
Print publication date: 01/07/2018
Online publication date: 20/01/2018
Acceptance date: 08/01/2018
Date deposited: 08/01/2018
ISSN (print): 0029-8018
ISSN (electronic): 1873-5258
Publisher: Pergamon Press
URL: https://doi.org/10.1016/j.oceaneng.2018.01.042
DOI: 10.1016/j.oceaneng.2018.01.042
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