Imperial College London
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ProfessorChrisCheeseman

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Materials Resources Engineering
 
 
 
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Contact

 

c.cheeseman

 
 
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Location

 

242Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Auwerter:2021:10.1061/%28ASCE%29HY.1943-7900.0001857,
author = {Auwerter, LC-C and Cheeseman, C and Templeton, M and Van, Reeuwijk M},
doi = {10.1061/%28ASCE%29HY.1943-7900.0001857},
journal = {Journal of Hydraulic Engineering},
pages = {1--10},
title = {Quantifying the durability of a friction-reducing surface with recoverable super-hydrophobicity},
url = {http://dx.doi.org/10.1061/%28ASCE%29HY.1943-7900.0001857},
volume = {147},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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 fd as a function of time for a new superhydrophobic surface that is capable of recovering the Cassie-Baxter wetting state. Values of fd 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 4.5×104 for all experiments. Reductions in fd 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 T 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 T 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.
AU  - Auwerter,LC-C
AU  - Cheeseman,C
AU  - Templeton,M
AU  - Van,Reeuwijk M
DO  - 10.1061/%28ASCE%29HY.1943-7900.0001857
EP  - 10
PY  - 2021///
SN  - 0733-9429
SP  - 1
TI  - Quantifying the durability of a friction-reducing surface with recoverable super-hydrophobicity
T2  - Journal of Hydraulic Engineering
UR  - http://dx.doi.org/10.1061/%28ASCE%29HY.1943-7900.0001857
UR  - https://ascelibrary.org/doi/10.1061/%28ASCE%29HY.1943-7900.0001857
UR  - http://hdl.handle.net/10044/1/82949
VL  - 147
ER  -
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