Simulations show two droplets hitting a micro‑structured hydrophobic surface bounce differently depending on spacing and angle. This dynamic is useful for surface engineering.

🔗 https://pubs.aip.org/aip/pof/article-abstract/38/2/027133/3380441/Dynamics-of-double-droplet-centered-impacting-a

#dropletimpact #hydrophobic #leidenfrosteffect #fluidmechanics #microstructure

RE: https://fairdinkum.one/@John/116156295239340696

#Lanolin. The #sheep are effectively "self-cleaning" or at least keep their inner fleece clean & dry in the #rain, largely due to lanolin, a natural waxy grease secreted by sheep's skin that makes their wool #hydrophobic, allowing rain to bead up and roll off rather than soaking into the coat. 🤔

Evaporating Off Butterfly Scales

This award-winning macro video shows scattered water droplets evaporating off a butterfly‘s wing. At first glance, it’s hard to see any motion outside of the camera’s sweep, but if you focus on one drop at a time, you’ll see them shrinking. For most of their lifetime, these tiny drops are nearly spherical; that’s due to the hydrophobic, water-shedding nature of the wing. But as the drops get smaller and less spherical, you may notice how the drop distorts the scales it adheres to. Wherever the drop touches, the wing scales are pulled up, and, when the drop is gone, the scales settle back down. This is a subtle but neat demonstration of the water’s adhesive power. (Video and image credit: J. McClellan; via Nikon Small World in Motion)

#adhesion #biology #butterfly #evaporation #fluidDynamics #hydrophobic #physics #science #sessileDrop

How Insects Fly in the Rain

Getting caught in the rain is annoying for us but has the potential to be deadly for smaller creatures like insects. So how do they survive a deluge? First, they don’t resist a raindrop, and second, they have the kinds of surfaces water likes to roll or bounce off. The key to this second ability is micro- and nanoscale roughness. Surfaces like butterfly wings, water strider feet, and leaf surfaces contain lots of tiny gaps where air gets caught. Water’s cohesion — its attraction to itself — is large enough that water drops won’t squeeze into these tiny spaces. Instead, like the ball it resembles, a water drop slides or bounces away. (Video and image credit: Be Smart)

#biology #butterfly #cohesion #droplets #fluidDynamics #hydrophobic #insects #physics #science #superhydrophobic #surfaceRoughness #surfaceTension

“Spines”

Water droplets cling to spine-covered plant life in this series from photographer Tom Leighton. The hairs are hydrophobic — notice how spherical the drops appear. Many plants make parts of their leaves and stems hydrophobic in order to redirect water toward their roots, where it can be taken in. Others use hair-like awns to collect and draw in dew that supplements their water capture. (Image credit: T. Leighton; via Colossal)

#biology #fluidDynamics #fluidsAsArt #hydrophobic #physics #plants #science

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#mosescartoons #cartoonist #cartoon #karikatur #lustig #humor #hydrophobie #hydrophobic #swimming #fun #funnycartoon