Abstract
The marvels of the slippery and clean sharkskin have inspired the development of many clinical and engineering products, although the mechanisms of interfacial interaction between the sharkskin and water have yet to be fully understood. In the present research, a methodology was developed to evaluate morphological parameters and to enable studying the effects of scale orientation on the fluidic behavior of water. The scale orientation of a shark skin was defined as the angle between the ridges and fluid flow direction. Textured surfaces with a series orientation of scales were designed and fabricated using 3D printing of acrylonitrile butadiene styrene (ABS). The fluid drag performance was evaluated using a rheometer. Results showed that the shark–skin-like surface with 90 degree orientation of scales exhibited the lowest viscosity drag. Its maximum viscosity reduction was 9%. A viscosity map was constructed based on the principals of fluid dynamic. It revealed that the drag reduction effect of a shark-skin-like surface was attributed to the low velocity gradient. This was further proven using diamond nitrogen-vacancy sensing where florescent diamond particles were distributed evenly when the velocity gradient was at the lowest. This understanding could be used as guidance for future surface design.
Highlights
The natural wonders of the sharkskin have attracted great attention in past decades
Scale orientation is defined as the angle between the ridges and fluid flow direction, which is circumferential
3.2 Fluidic performance In the step we investigate the fluidic performance of shark-skinned surfaces to reveal the effect of scale orientation
Summary
The slippery and textured shark skin has inspired biologists and engineers to design product with like surfaces for better performance. Despite the wide diversity of shark skins, a large amount of work has been reported trying to develop a simplified model. Such models have considered cross sectional profiles including blade [2−4], saw tooth [5−7], and scallop [8−10]. In prior work optimizing morphological parameters in drag reduction [11−13], the best combination was the blade shape of 0.5 in height-to-spacing ratio. Under this condition the maximum drag reduction of 9.9% was obtained [14]. This work is based on the design of blade-shaped shark–skin-like surfaces
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