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Viscous entrainment on hairy surfaces

Author(s): Nasto, A; Brun, PT; Hosoi, AE

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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.
Publication Date: 1-Feb-2018
Electronic Publication Date: 7-Feb-2018
Citation: Nasto, A, Brun, PT, Hosoi, AE. (2018). Viscous entrainment on hairy surfaces. Physical Review Fluids, 3 (2), 10.1103/PhysRevFluids.3.024002
DOI: doi:10.1103/PhysRevFluids.3.024002
EISSN: 2469-990X
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Fluids
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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