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Embargo End Date2024-02-16
Permanent link to this recordhttp://hdl.handle.net/10754/682058
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AbstractA water droplet can bounce off superhydrophobic surfaces multiple times before coming to a stop. The energy loss for such droplet rebounds can be quantified by the ratio of the rebound speed UR and the initial impact speed UI; i.e., its restitution coefficient e = UR/UI. Despite much work in this area, a mechanistic explanation for the energy loss for rebounding droplets is still lacking. Here, we measured e for submillimeter- and millimeter-sized droplets impacting two different superhydrophobic surfaces over a wide range of UI (4–700 cm s–1). We proposed simple scaling laws to explain the observed nonmonotonic dependence of e on UI. In the limit of low UI, energy loss is dominated by contact-line pinning and e is sensitive to the surface wetting properties, in particular to contact angle hysteresis Δ cos θ of the surface. In contrast, e is dominated by inertial-capillary effects and does not depend on Δ cos θ in the limit of high UI.
CitationThenarianto, C., Koh, X. Q., Lin, M., Jokinen, V., & Daniel, D. (2023). Energy Loss for Droplets Bouncing Off Superhydrophobic Surfaces. Langmuir. https://doi.org/10.1021/acs.langmuir.2c03449
SponsorsThe authors thank Wang and co-workers for sharing their data with us.
PublisherAmerican Chemical Society (ACS)
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