Quantifying the Durability of a Friction-Reducing Surface with Recoverable Superhydrophobicity
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 4
Abstract
The durability of superhydrophobic surfaces in fully immersed conditions is a major obstacle to their application in engineering applications. We perform an experimental study to measure the friction factor as a function of time for a new superhydrophobic surface that is capable of recovering the Cassie-Baxter wetting state. Values of were obtained by measuring the pressure drop and volume flux of a turbulent water flow in a 1.5 m long duct containing one superhydrophobic wall. The Reynolds number of the flow was approximately for all experiments. Reductions in were 29%–36% relative to a hydraulically smooth surface. The Cassie-Baxter state could be recovered by blowing air through the porous surface for 10 min. The durability of the drag-reduction, as quantified by the relaxation time in which the surface loses its superhydrophobic characteristics, were measured to be between 10 and 60 min depending on the initial head. The relaxation time was highly dependent on the pressure difference across the surface. In contrast to models based on Darcy flow through a porous medium, the study indicates that there seems to be a critical pressure difference beyond which the Cassie-Baxter state cannot be sustained for the material under consideration.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request. Data generated in this research and available upon request include the following: measurements of the piezometric head and volume flux over time.
Acknowledgments
We would like to acknowledge support from David De Ruyter for his direct technical help and the UK Engineering and Physical Sciences Research Council (EPSRC), who fund the Centre for Doctoral Training in Sustainable Civil Engineering in the Department of Civil and Environmental Engineering at Imperial College London via Grant No. EP/L016826/1.
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Published In
Journal of Hydraulic Engineering
Volume 147 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 27, 2019
Accepted: Sep 29, 2020
Published online: Jan 18, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 18, 2021
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