Air entrainment in hairy surfaces
Name
PhysRevFluids.1.033905.pdf
Size
1.29 MB
Format
Adobe PDF
Checksum (MD5)
06e44630b3755d4277a3aab143765798
Author(s)
Clanet, Christophe
Nasto, Alice Meite
Regli, Marianne
Brun, Pierre-Thomas
Alvarado, Jose Ramon
Hosoi, Anette E
Date Issued
July 2016
Journal
Physical Review Fluids
Publisher
American Physical Society (APS)
Citation
Nasto, Alice et al. “Air Entrainment in Hairy Surfaces.” Physical Review Fluids 1, 3 (July 2016): 033905 © 2016 American Physical Society
Version
Final published version
Abstract
Motivated by diving semiaquatic mammals, we investigate the mechanism of dynamic air entrainment in hairy surfaces submerged in liquid. Hairy surfaces are cast out of polydimethylsiloxane elastomer and plunged into a fluid bath at different velocities. Experimentally, we find that the amount of air entrained is greater than what is expected for smooth surfaces. Theoretically, we show that the hairy surface can be considered as a porous medium and we describe the air entrainment via a competition between the hydrostatic forcing and the viscous resistance in the pores. A phase diagram that includes data from our experiments and biological data from diving semiaquatic mammals is included to place the model system in a biological context and predict the regime for which the animal is protected by a plastron of air.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVFLUIDS.1.033905
