Abstract
The artificial drag-reducing surface with biological sharkskin morphology was fabricated by the direct bio-replicated method, and the satisfactory drag reduction effect was validated in the water tunnel. However, the splicing step is necessary for the area larger than the entire surface of shark, the consequence of which is that the complexity of process will be increased seriously. At the meanwhile, two adverse effects may appear, namely, the stress contraction on the jointing seams and the drop-out phenomenon. Therefore, it is urgent to manufacture the continuous biomimetic sharkskin surface. In this paper, a novel and facile method to fabricate the drag-reducing surface on a semi-cured coating based on biological sharkskin is investigated and explored. Firstly, the sputtering and photo lithography processes are put into application to eliminate the wedge angle on scale’s back. Secondly, the relationship between forming precision and curing degree of epoxy resin is inspected and the appropriate time-zone fitting for bio/micro-rolling is attained. Thirdly, the continuous sharkskin surface is manufactured in a large area. Lastly, for evaluating the effect of drag reduction, an experiment is performed. The experimental results show the drag reduction efficiency of the surface fabricated by the bio/micro rolling method, which can expand more applications in the fluid engineering.
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