Effect of geometric parameters of superhydrophobic surface on liquid slip

Choongyeop Lee, Chang Hwan Choi, Chang Jin Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In this paper, we experimentally study how geometric parameters of textured hydrophobic surfaces affect a liquid slip, empowered by a custom-tuned microfabrication procedure that produces regular micro-patterns of posts and grates on an entire 4″ wafer with a good size uniformity and no defect. A pitch of the patterns and a gas fraction of the structured surface are independently controlled, and the slip length over each type of patterns is measured using a rheometer system. On both grates and posts, the slip length increases linearly with a pitch but exponentially with a gas fraction. The trend of exponential increase by gas fraction appears more pronounced on posts than on grates. The defect-free surfaces allow the flows to maintain a de-wetted (Cassie) state at much higher pitches and gas fractions than previously possible, permitting flows with the maximum slip effect.

Original languageEnglish
Title of host publication2008 Proceedings of ASME International Mechanical Engineering Congress and Exposition, IMECE 2008
Pages77-86
Number of pages10
EditionPART A
DOIs
StatePublished - 2009
Event2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008 - Boston, MA, United States
Duration: 31 Oct 20086 Nov 2008

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings
NumberPART A
Volume10

Conference

Conference2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008
Country/TerritoryUnited States
CityBoston, MA
Period31/10/086/11/08

Keywords

  • Drag reduction
  • Liquid slip
  • Superhydrophobic surface
  • Wetting transition

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