We investigate the slippage effect in a super-hydrophobic micro-channel. The micro-scale grooves are fabricated on the vertical wall to make the super-hydrophobic surfaces, which enable us visualize the flow fields near walls and directly measure the slip length. Velocity profiles are measured using micro-particle image velocimetry (PIV). The velocity profile near the wall shows larger slip length and, if the groove structure is high and wide, the liquid meniscus forms curves into the valley so that the wavy flow is created after the grooves. Also depending on the ratio of pitch to width of the groove structure, the water meniscus status can be either sustained between the valleys or collapsed to be wet. This Cassie to Wenzel transition is observed in the micro-channel. And we investigate the effects of grooves shape and the flow rate on the wetting transition.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Slippage and Wetting Transition of Water Flow in Superhydrophobic Micro-Channel
Doyoung Byun,
Doyoung Byun
Konkuk University, Seoul, South Korea
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Jihoon Kim,
Jihoon Kim
Konkuk University, Seoul, South Korea
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Jongin Hong
Jongin Hong
Imperial College London, London, UK
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Doyoung Byun
Konkuk University, Seoul, South Korea
Jihoon Kim
Konkuk University, Seoul, South Korea
Jongin Hong
Imperial College London, London, UK
Paper No:
ICNMM2008-62341, pp. 1229-1235; 7 pages
Published Online:
June 11, 2009
Citation
Byun, D, Kim, J, & Hong, J. "Slippage and Wetting Transition of Water Flow in Superhydrophobic Micro-Channel." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 1229-1235. ASME. https://doi.org/10.1115/ICNMM2008-62341
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