TY - GEN
T1 - Effect of geometric parameters of superhydrophobic surface on liquid slip
AU - Lee, Choongyeop
AU - Choi, Chang Hwan
AU - Kim, Chang Jin
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
KW - Drag reduction
KW - Liquid slip
KW - Superhydrophobic surface
KW - Wetting transition
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U2 - 10.1115/IMECE2008-68190
DO - 10.1115/IMECE2008-68190
M3 - Conference contribution
AN - SCOPUS:70049098270
SN - 9780791848715
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings
SP - 77
EP - 86
BT - 2008 Proceedings of ASME International Mechanical Engineering Congress and Exposition, IMECE 2008
T2 - 2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008
Y2 - 31 October 2008 through 6 November 2008
ER -