Viscous entrainment on hairy surfaces
Name
PhysRevFluids.3.024002.pdf
Size
1.42 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Nasto, Alice Meite
Brun, P.-T.
Hosoi, Anette E
Date Issued
February 2018
Journal
Physical Review Fluids
Publisher
American Physical Society
Citation
Nasto, Alice et al. "Viscous entrainment on hairy surfaces." Physical Review Fluids 3, 2: 024002 © 2018 American Physical Society
Version
Final published version
Abstract
Nectar-drinking bats and honeybees have tongues covered with hairlike structures, enhancing their ability to take up viscous nectar by dipping. Using a combination of model experiments and theory, we explore the physical mechanisms that govern viscous entrainment in a hairy texture. Hairy surfaces are fabricated using laser cut molds and casting samples with polydimethylsiloxane (PDMS) elastomer. We model the liquid trapped within the texture using a Darcy-Brinkmann-like approach and derive the drainage flow solution. The amount of fluid that is entrained is dependent on the viscosity of the fluid, the density of the hairs, and the withdrawal speed. Both experiments and theory reveal an optimal hair density to maximize fluid uptake.
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.
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DOI of Published Version
https://doi.org/10.1103/PhysRevFluids.3.024002
