Towards an absolute scale for adhesion strength of ship hull microfouling
Journal article, 2019

In-water ship hull cleaning enables significant fuel savings through removal of marine fouling from underwater surfaces. Unfortunately, cleaning may also shorten the lifetime of hull coatings, with subsequent increase in fouling growth rate. Deleterious effects of cleaning would be minimized by matching cleaning forces to the adhesion strength of early stages of fouling, or microfouling. Calibrated waterjets are routinely used for comparing different coatings in terms of adhesion strength of microfouling. However, an absolute scale is lacking for translating such results into cleaning forces, of interest for design and operation of hull cleaning devices. This paper discusses how to determine such forces, namely using Computational Fluid Dynamics. Semi-empirical formulas are derived for forces under immersed waterjets, where the normal and tangential components of wall forces are given as functions of different flow parameters. Nozzle translation speed is identified as a parameter for future research, as this may affect cleaning efficacy.

adhesion strength

ship hull fouling

marine fouling

Energy efficiency

microfouling

calibrated waterjet

Author

Dinis Oliveira

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

Lars Larsson

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Lena Granhag

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

Biofouling

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

Vol. 35 2 244-258

Completing management options in the Baltic Sea Region to reduce risk of invasive species introduction by shipping COMPLETE

Interreg-BSR, 2017-10-01 -- 2020-09-30.

Subject Categories

Environmental Management

Fluid Mechanics and Acoustics

DOI

10.1080/08927014.2019.1595602

More information

Latest update

7/26/2019