Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Fabrication of a Micro-riblet Shark Skin-like Surface using a WEDM Process

와이어 방전가공을 이용한 상어 표피 모사 리블렛 표면 제작

  • Park, Young Whan (Department of Mechanical Engineering, Pukyong National University) ;
  • Kim, Tae Wan (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2016.09.10
  • Accepted : 2016.11.06
  • Published : 2016.12.31
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Abstract

In this study, we attempt to produce a semi-elliptical riblet with a shark skin-like surface using wire electrical discharge machining (WEDM) and micro molding techniques. Our design for the production of the semi-elliptical mold includes an electrode, a winding roller, and a guide on the WEDM system. A replication mold with negative riblets is machined using WEDM, and a shark skin inspired surface with positive riblets is fabricated using a micro molding technique. For a comparison with the original shark skin, a shark skin replica is also produced using the micro molding technique directly from a shark skin template. Droplet contact angles on a flat surface, the shark skin replica, and the epoxy resin-based micro riblet shark skin-like surface are evaluated. The effect of a Teflon coating on the contact angles for the three different surfaces is also investigated. The results show the micro riblet with a shark skin-like surface has a similar contact angle as the shark skin replica, which means that the simplified riblet shark skin surface strongly influences the performance of wettability. This study confirms the effectiveness of using the WEDM method to prepare hydrophobic surfaces with diverse surface patterns.

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References

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