The use of superhydrophobic surfaces in confined flows is of particular interest as these surfaces have been shown to exhibit a drag reduction effect that is orders of magnitude larger than those due to molecular slip. In this paper we present experimental results of the pressure-driven flow of water in a parallel-plate microchannel having a no-slip upper wall and a superhydrophobic lower wall. Pressure-drop versus flow-rate measurements characterize the apparent slip behavior of the superhydrophobic surfaces with varying pillar-to-pillar pitch spacing and pillar diameter. The superhydrophobic surface consists of a square array of cylindrical pillars that are fabricated by deep reactive ion etching on silicon and coated with a hydrophobic fluoropolymer. A major challenge, in correlating our experimental results with existing theoretical predictions, is uncertainty in the location of the gas/liquid interface and the associated gas/liquid/solid contact line within the pillar features comprising the superhydrophobic surface. We present experimental results, from laser-scanning confocal microscopy, that measure the location of the gas-liquid interface and associated contact line for fluid flowing through a parallel-plate microchannel. Knowledge of the contact line location is then used to correlate experimental pressure-drop versus flow-rate data with a theoretical model based on porous-flow theory that takes into account partial penetration of liquid into a superhydrophobic surface.
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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
Effects of Interfacial Position on Drag Reduction in a Superhydrophobic Microchannel
Ryan Enright,
Ryan Enright
University of Limerick, Limerick, Ireland
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Tara Dalton,
Tara Dalton
University of Limerick, Limerick, Ireland
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Tom N. Krupenkin,
Tom N. Krupenkin
Alcatel-Lucent, Murray Hill, NJ
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Paul Kolodner,
Paul Kolodner
Alcatel-Lucent, Murray Hill, NJ
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Todd R. Salamon
Todd R. Salamon
Alcatel-Lucent, Murray Hill, NJ
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Ryan Enright
University of Limerick, Limerick, Ireland
Tara Dalton
University of Limerick, Limerick, Ireland
Tom N. Krupenkin
Alcatel-Lucent, Murray Hill, NJ
Paul Kolodner
Alcatel-Lucent, Murray Hill, NJ
Marc Hodes
Alcatel-Lucent, Murray Hill, NJ
Todd R. Salamon
Alcatel-Lucent, Murray Hill, NJ
Paper No:
ICNMM2008-62251, pp. 835-845; 11 pages
Published Online:
June 11, 2009
Citation
Enright, R, Dalton, T, Krupenkin, TN, Kolodner, P, Hodes, M, & Salamon, TR. "Effects of Interfacial Position on Drag Reduction in a Superhydrophobic Microchannel." 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. 835-845. ASME. https://doi.org/10.1115/ICNMM2008-62251
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