Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Friction Drag Reduction using Microstructured Surfaces

마이크로 구조를 이용한 유체 표면마찰의 감소

  • Park, Chi-Yeol (Graduate school of Mechanical Engineering, Pusan National Univ.) ;
  • Bae, Seung-Il (Graduate school of Mechanical Engineering, Pusan National Univ.) ;
  • Lee, Sang-Min (Graduate school of Mechanical Engineering, Pusan National Univ.) ;
  • Ko, Jong-Soo (Graduate school of Mechanical Engineering, Pusan National Univ.) ;
  • Chung, Kwang-Hyo (Electronics and Telecommunications Research Institute)
  • Published : 2009.12.01
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Abstract

The hexagonal network-type PDMS microstructures were fabricated and they were employed to low-friction drag surfaces. While the lowest contact angle measured from the smooth surface was $108^{\circ}$ the highest contact angle measured from the microstructured surfaces was $145^{\circ}$ The moving speed of bullet-type capsule attached with a PDMS pad of smooth surface ($CA=108^{\circ}$) was 0.1261 m/s and that with a PDMS pad of microstructured surface ($CA=145^{\circ}$) was 0.1464 m/s. Compared with the smooth surface, the microstructured surface showed 16.1% higher moving speed. The network-type microstructures have a composite surface that is composed with air and PDMS solid. Therefore, the surface does not wet: rather water is lifted by the microstructures. Because of the composite surface, water shows slip-flow on the microstructures, and thus friction drag can be reduced.

Keywords

References

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