Dual-composite drag-reduction surface based on the multilayered structure and mechanical properties of tuna skin,Microscopy Research and Technique

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Dual-composite drag-reduction surface based on the multilayered structure and mechanical properties of tuna skin
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2021-03-05 , DOI: 10.1002/jemt.23743
Dengke Chen ₁ , Xianxian Cui ₁ , Huawei Chen _{1,

2}

Affiliation

Energy efficiency and friction reduction have attracted considerable research attention. To design low drag surfaces, researchers derived inspiration from nature on various types of drag reduction methods with exceptional functional surfaces, such as fish skin that possesses low friction. Fishes with high-performance swimming possess a range of physiological and mechanical adaptations that are of considerable interest to physiologists, ecologists, and engineers. Although tuna is a fast-swimming ocean-based predator, most people focus their attention on its nutritional value. In this study, the multilayered structures and mechanical properties of tuna skin are first analyzed, and then the drag-reduction effect of the bionic fish-scale and dual-composite surfaces are studied based on the computational fluid dynamics method. The results indicate that tuna skin is composed of five layers, with the fish scale covered by a flexible epidermis layer. According to the uniaxial tension results, the modulus and tensile strength of the epidermis are obtained as 1.17 and 20 MPa, respectively. The nanoindentation results show that the modulus and hardness of the outer surface of the fish scale are larger than that of the inner surface, while those of the dry state are larger than those of the hydrated state. The simulation results show that both the bionic fish-scale and dual-composite surfaces display drag reduction, with the maximum drag-reduction rate of 25.7% achieved by the bionic dual-composite surface. These findings can offer a reference for in-depth performance analysis of the hydrodynamics of tuna and provide new sources of inspiration for drag reduction and antifouling.

中文翻译：

基于金枪鱼皮多层结构和力学性能的双复合减阻面

能源效率和减少摩擦引起了相当多的研究关注。为了设计低阻力表面，研究人员从大自然中汲取灵感，开发了具有特殊功能表面的各种类型的减阻方法，例如具有低摩擦力的鱼皮。具有高性能游泳能力的鱼类具有一系列生理和机械适应性，生理学家、生态学家和工程师对此非常感兴趣。尽管金枪鱼是一种快速游动的海洋捕食者，但大多数人都将注意力集中在其营养价值上。本研究首先分析了金枪鱼皮的多层结构和力学性能，然后基于计算流体动力学方法研究了仿生鱼鳞和双复合表面的减阻效果。结果表明金枪鱼皮由五层组成，鱼鳞上覆盖着一层柔软的表皮。根据单轴拉伸结果，表皮的模量和拉伸强度分别为1.17和20 MPa。纳米压痕结果表明，鱼鳞外表面的模量和硬度大于内表面，而干燥状态的大于水合状态的。模拟结果表明，仿生鱼鳞和双复合表面均具有减阻效果，仿生双复合表面的最大减阻率为25.7%。

更新日期：2021-03-05

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