Drag Reduction Using Lubricant‐Impregnated Anisotropic Slippery Surfaces Inspired by Bionic Fish Scale Surfaces Containing Micro‐/Nanostructured Arrays

2020 ◽  
pp. 2000821
Author(s):  
Wanting Rong ◽  
Haifeng Zhang ◽  
Tengjiao Zhang ◽  
Zhigang Mao ◽  
Xiaowei Liu ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Fish Scale ◽  
Nanostructured Arrays

Stable drag reduction of anisotropic superhydrophobic/hydrophilic surfaces containing bioinspired micro/nanostructured arrays by laser ablation

2021 ◽  
Vol 622 ◽  
pp. 126712
Author(s):  
Wanting Rong ◽  
Haifeng Zhang ◽  
Zhigang Mao ◽  
Liang Chen ◽  
Xiaowei Liu
Keyword(s):  
Laser Ablation ◽  
Drag Reduction ◽  
Hydrophilic Surfaces ◽  
Nanostructured Arrays

scholarly journals Improved Stable Drag Reduction of Controllable Laser-Patterned Superwetting Surfaces Containing Bioinspired Micro/Nanostructured Arrays

ACS Omega ◽  
2022 ◽  
Author(s):  
Wanting Rong ◽  
Haifeng Zhang ◽  
Zhigang Mao ◽  
Liang Chen ◽  
Xiaowei Liu
Keyword(s):  
Drag Reduction ◽  
Nanostructured Arrays

scholarly journals Laser Powder Bed Fusion of a Topology Optimized and Surface Textured Rudder Bulb with Lightweight and Drag-Reducing Design

2021 ◽  
Vol 9 (9) ◽  
pp. 1032
Author(s):  
Alessandro Scarpellini ◽  
Valentina Finazzi ◽  
Paolo Schito ◽  
Arianna Bionda ◽  
Andrea Ratti ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Surface Texture ◽  
Topological Optimization ◽  
Hydrodynamic Resistance ◽  
Stream Velocity ◽  
Fish Scale ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
European Sea Bass ◽  
Powder Bed

This work demonstrates the advantages of using laser powder bed fusion for producing a rudder bulb of a moth class sailing racing boat via laser powder bed fusion (LPBF). The component was designed to reduce weight using an AlSi7Mg0.6 alloy and incorporated a biomimetic surface texture for drag reduction. For the topological optimization, the component was loaded structurally due to foil wing’s lift action as well as from the environment due to hydrodynamic resistance. The aim was to minimize core mass while preserving stiffness and the second to benefit from drag reduction capability in terms of passive surface behavior. The external surface texture is inspired by scales of the European sea bass. Both these features were embedded to the component and produced by LPBF in a single run, with the required resolution. Drag reduction was estimated in the order of for free stream velocity of . The production of the final part resulted in limited geometrical error with respect to scales 3D model, with the desired mechanical properties. A reduction in weight of approximately with respect to original full solid model from 452 to 190 g was achieved thanks to core topology optimization. Sandblasting was adopted as finishing technique since it was able to improve surface quality while preserving fish scale geometries. The feasibility of producing the biomimetic surfaces and the weight reduction were validated with the produced full-sized component.

scholarly journals Analysis of the Influence of Pit Unit Arrangement on the Drag Reduction Performance of Fish-scale Pits

2021 ◽  
Vol 1885 (2) ◽  
pp. 022029
Author(s):  
Jin-Ming Hou ◽  
Guang-Feng Shi ◽  
Liang Li ◽  
hong-Da Li ◽  
mingqiang Xia
Keyword(s):  
Drag Reduction ◽  
Fish Scale

Scanning Electron Microscopy of Fish Scales as an Adjunctive Aid in Speciation

1972 ◽  
Vol 30 ◽  
pp. 394-395
Author(s):  
Edward D. DeLamater ◽  
Walter R. Courtenay ◽  
Cecil Whitaker
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lateral Line ◽  
Species Differences ◽  
Fish Scale ◽  
Fish Scales ◽  
Anterior Border ◽  
The University ◽  
Multiple Holes ◽  
Scanning Electron

Comparative scanning electron microscopy studies of fish scales of different orders, families, genera and species within genera have demonstrated differences which warrant elaboration. These differences in detail appear to be sufficient to act as “fingerprints”, at least, for family differences. To date, the lateral line scales have been primarily studied. These demonstrate differences in the lateral line canals; the pattern of ridging with or without secondary protuberances along the edges; the pattern of spines or their absence on the anterior border of the scales; the presence or absence of single or multiple holes on the ventral and dorsal sides of the lateral line canal covers. The distances between the ridges in the pattern appear likewise to be important.A statement of fish scale structure and a comparison of family and species differences will be presented.The authors wish to thank Dr. Donald Marzalek and Mr. Wallace Charm of the Marine and Atmospheric Laboratory of the University of Miami and Dr. Sheldon Moll and Dr. Richard Turnage of AMR for their exhaustive help in these preliminary studies.

SEM analysis of fish scale cross sections: A technique study

1992 ◽  
Vol 50 (1) ◽  
pp. 744-745
Author(s):  
M.E. Lee ◽  
A. Moller ◽  
P.S.O. Fouche ◽  
I.G Gaigher
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cross Sections ◽  
Soft Tissues ◽  
Close Association ◽  
Sem Analysis ◽  
Fish Scale ◽  
Fish Scales ◽  
Micro Structures ◽  
Scanning Electron

Scanning electron microscopy of fish scales has facilitated the application of micro-structures to systematics. Electron microscopy studies have added more information on the structure of the scale and the associated cells, many problems still remain unsolved, because of our incomplete knowledge of the process of calcification. One of the main purposes of these studies has been to study the histology, histochemistry, and ultrastructure of both calcified and decalcified scales, and associated cells, and to obtain more information on the mechanism of calcification in the scales. The study of a calcified scale with the electron microscope is complicated by the difficulty in sectioning this material because of the close association of very hard tissue with very soft tissues. Sections often shatter and blemishes are difficult to avoid. Therefore the aim of this study is firstly to develop techniques for the preparation of cross sections of fish scales for scanning electron microscopy and secondly the application of these techniques for the determination of the structures and calcification of fish scales.

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