The mechanism of drag reduction performance depending on the secretion rate of biomimetic mucus for a bio-inspired surface

• Published in: Ocean engineering Vol. 310; p. 118594
• Main Authors: Zhang, Kaisheng, Zhang, Kaizhen, Zhang, Yitong, Zhang, Jing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.10.2024
• Subjects: Bionic mucus; Drag reduction performance; Secretion rate; Stripe structure; Vortex structure; Drag reduction performance; Vortex structure; Secretion rate; Bionic mucus; Stripe structure
• ISSN: 0029-8018
• DOI: 10.1016/j.oceaneng.2024.118594

Based on the synergistic drag reduction of bionic surface and bionic mucus, this research provides a hydrodynamic model of bionic surfaces. The influence of bionic mucus secretion speed on the drag reduction effect of bionic surface is analyzed using three methods: numerical simulation, theoretical calculation, and experimental verification. The drag reduction effect of bionic mucus is then examined, and the drag reduction mechanism of bionic surface is revealed. The results reveal that the secretion speed of bionic mucus influences the drag reduction effect of the bionic surface. When the water flow velocity is 2 m/s and the mucus secretion velocity is 0.05 m/s, the drag reduction effect is optimal. The simulated drag reduction rate is 31.06%, while the experimental rate is 28.11%. In this paper a two-dimensional slip length model was proposed to calculate the slip length of water relative to the wall surface, and the shear stress of the wall surface under this model is derived, revealing the drag reduction mechanism of the bionic slime and providing a theoretical basis for the secretion rate of the bionic slime on the surface of the underwater navigable body. •A bionic drag-reducing surface with microstructures and continuous mucus secretion is proposed.•The effect of mucus secretion rate on drag reduction performance is investigated by simulation and experimental.•A new second-order slip model is proposed to reveal the mechanism of drag reduction performance of bionic mucus.