Bionic drag reduction surface from shark skin and bioinspired anti-icing surface from superhydrophobic lotus leaf

2022 ◽  
pp. 197-226
Author(s):  
Deyuan Zhang ◽  
Huawei Chen ◽  
Yonggang Jiang ◽  
Jun Cai ◽  
Lin Feng ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Shark Skin ◽  
Lotus Leaf

Controllable Adjustment of Bio-Replicated Shark Skin Drag Reduction Riblets

2013 ◽  
Vol 461 ◽  
pp. 677-680 ◽  
Author(s):  
Xin Zhang ◽  
De Yuan Zhang ◽  
Jun Feng Pan ◽  
Xiang Li ◽  
Hua Wei Chen
Keyword(s):  
Drag Reduction ◽  
Living Environment ◽  
Reduction Peak ◽  
Shark Skin ◽  
Forming Technology ◽  
Surrounding Environment ◽  
Maximum Drag Reduction ◽  
Reduction Function ◽  
Volume Swelling ◽  
3D Volume

Although natural shark shin surface morphology has excellent drag reduction performance, it exhibits maximum drag reduction just within swimming speed of the shark. That is, drag reduction function of shark skin is unadjustable to surrounding environment. To expand applications of bio-replicated shark skin, two novel controllable adjustments of shark skin drag reduction riblets including one-direction elongation and 3D volume swelling amplification, were explored. The validity and efficiency of the two approaches to change the drag reduction riblets were verified by comparison between microstructure of adjusted and original shark skin. And the translation of drag reduction peak of natural surface function from living environment to various application environments was proved by experimental measurement. By comparison, the elongating method is efficient but low drag reduction, while the swelling way can get the same drag reduction as shark skin but cost more time. So they should be performed according to the situation. As the optimal application velocity range of the imitative shark shin morphology can be expanded by both of the two methods, the application field of the biomimetic drag reduction surface fabricated by the bio-replicated forming technology was extended.

scholarly journals Analysis of Shark Skin Riblet Surfaces for Fluid Drag Reduction in Turbulent Flow Regime

2019 ◽  
Vol 9 (1S4) ◽  
pp. 666-668
Keyword(s):  
Fluid Flow ◽  
Flow Field ◽  
Turbulent Flow ◽  
Drag Reduction ◽  
Flow System ◽  
Shark Skin ◽  
Structured Surfaces ◽  
Turbulent Flow Regime ◽  
Fluid Drag ◽  
Fluid Drag Reduction

: The integument of fast swimming shark exhibits riblet inspired micro- structured surfaces oriented in the path of flow that will help to make lesser the wall drag in the tempestuous-flow system (turbulent flow). Design have been made for study and utilization, that has been recreate and refine as same as of the shark-skin riblets, presuming an extreme drag depletion of nearly 10% (percent). Mechanism of fluid drag in tempestuous flow and riblet drag depletion theories from experiments and simulations are examined. An examination of riblet intrepratation are discussed and the stellar riblet sizes are defined. An assessment of studies experimenting with riblets-topped shark scale replicas is also discussed. A method for preferring stellar riblet dimensions based on fluid-flow attributes is briefed and current manufacturing approaches are summarized. Due to the existence of little amounts of mucus/booger membranes on the integument of the shark, it is presumed that the constrained application of aqua phobic materials will recast the flow field around the riblets in some way favorable to the goals of augmented drag depletion

Shark Skin Drag Reduction

2015 ◽  
pp. 1-8 ◽  
Author(s):  
Amy Lang ◽  
Maria Laura Habegger ◽  
Philip Motta
Keyword(s):  
Drag Reduction ◽  
Shark Skin

scholarly journals Drag-reduction of 3D printed shark-skin-like surfaces

Friction ◽  
2018 ◽  
Vol 7 (6) ◽  
pp. 603-612 ◽  
Author(s):  
Wei Dai ◽  
Masfer Alkahtani ◽  
Philip R. Hemmer ◽  
Hong Liang
Keyword(s):  
Drag Reduction ◽  
Shark Skin ◽  
3D Printed

Fluid flow analysis of a shark-inspired microstructure

2014 ◽  
Vol 756 ◽  
pp. 5-29 ◽  
Author(s):  
Samuel Martin ◽  
Bharat Bhushan
Keyword(s):  
Fluid Flow ◽  
Drag Reduction ◽  
Computational Models ◽  
Flat Surface ◽  
Flow Analysis ◽  
Flow Properties ◽  
Shark Skin ◽  
Reduction Mechanisms ◽  
Vortex Size ◽  
Fluid Flow Analysis

AbstractThe scales of fast-swimming sharks contain riblet structures with microgrooves, aligned in the direction of fluid flow, that result in water moving efficiently over the surface. In previous studies, these riblet structures have shown a drag reduction of up to 10 % when compared with a smooth, flat surface. These studies have suggested two prevalent drag-reduction mechanisms which involve the effect of vortices and turbulence fluctuations. To further explore relevant mechanisms and study the effect of riblet geometry and flow properties on drag, vortices and turbulence fluctuations, various shark-skin-inspired riblet structures were created using computational models in which velocity, viscosity, spacing, height and thickness parameters were independently modified. A relevant mechanism of drag reduction is discussed to relate riblet parameters and flow properties to drag change and vortex size. Modelling information will lead to a better understanding of riblets and allow for optimum drag-reducing designs for applications in marine, medical and industrial fields.

Progress and Perspective of Studies on Biomimetic Shark Skin Drag Reduction

2016 ◽  
Vol 3 (1) ◽  
pp. 26-40 ◽  
Author(s):  
Xia Pu ◽  
Guangji Li ◽  
Yunhong Liu
Keyword(s):  
Drag Reduction ◽  
Shark Skin
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