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TY - JOUR TI - The effect of the loss of superhydrophobic surface properties on biofouling and flow around shipbuilding's steel plates AU - Ivanovich, Ukolov Aleksei AU - Nickolayevna, Popova Tatiana AU - Viktorovich, Kulish Andrey T2 - Ocean Engineering AB - The dependence of the degree of biofouling on the magnitude of the contact angle θ during temporary degradation of the superhydrophobic coating of shipbuilding steel A40S in the process of being under water is examined. The experiment showed that the gas gap between the liquid and the structured surface makes it difficult for the first settlements to appear at θ ≥ 130°. In 35 days of being underwater and losing the hydrophobic properties of the coating, there were discovered the serpules (Serpula vermicularis), bryozoans (Bryozoa) and green algae (Chlorophyta), but there is no balanus (Balanidae - Chthamalus stellatus) and sponges (Porifera), which are observed on the untreated opposite sample side. The results of an in vivo experiment were used to CFD the dependence of water's flow velocity along the plate surface. Numerical calculation was determined the ratio of the initial flow velocity rate to its value at the end of the model plates. The transition from the hydrophilic state to the hydrophobic state reduces the value of the surface resistance by 1.44 times (changes in the velocity ν0/ν ≈ 2.6 are hydrophilic, ν0/ν ≈ 1.8 hydrophobic). An increase in surface roughness due to fouling will further increase the speed ratio by another 1.19–1.22 times. DA - 2020/10/15/ PY - 2020 DO - 10.1016/j.oceaneng.2020.107801 DP - ScienceDirect VL - 214 SP - 107801 J2 - Ocean Engineering LA - en SN - 0029-8018 UR - http://www.sciencedirect.com/science/article/pii/S0029801820307770 Y2 - 2020/08/26/09:35:05 KW - CFD KW - Contact angle KW - Fouling KW - Roughness KW - Shipbuilding steel KW - Superhydrophobicity ER -