#droplets

Plsik (born in 320 ppm) 🇨🇿🇺🇦🇵🇸plsik
2025-06-08
Photograph of a drop of water hanging from the tip of a narrow, jagged tree leaf. The background is blurred.
2025-06-02

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

Plsik (born in 320 ppm) 🇨🇿🇺🇦🇵🇸plsik
2025-05-26

Some raindrops for Monday.

Photograph of a few drops of water on a grass blade. The structure of many tiny spines can be seen in the grass leaf at high magnification. The water droplets are almost spherical in shape and translucent.
Plsik (born in 320 ppm) 🇨🇿🇺🇦🇵🇸plsik
2025-05-24

More drops for Saturday. Taken in the morning, on the way to the bike from the night shift (yes, this is much better to take pictures than on the way to the morning shift, when I don't want to be late for the meeting).

Plsik (born in 320 ppm) 🇨🇿🇺🇦🇵🇸plsik
2025-05-24

Droplets for Saturday

Green leaf in vertical position photographed from the border, its underside is covered with hairs. The hairs have round droplets of water attached to them.
Plsik (born in 320 ppm) 🇨🇿🇺🇦🇵🇸plsik
2025-05-18
Photo of a leaf in macro mode, a drop of water lying on the leaf in the shape of an almost perfect ball. The leaf is facing upwards with the flat of the crater mostly at the bottom, it is hairy on this side and has a silver-green colour. The tiny drop of water is clear and held in place in the hairs of the leaf. The lower part of the round drop reflects the green colour of the leaf, the upper part is full of light. The background of the photograph is blurred and has the green colour of the leaf.
2025-05-08

Charged Drops Don’t Splash

When a droplet falls on a surface, it spreads itself horizontally into a thin lamella. Sometimes — depending on factors like viscosity, impact speed, and air pressure — that drop splashes, breaking up along its edge into myriad smaller droplets. But a new study finds that a small electrical charge is enough to suppress a drop’s splash, as seen below.

The drop’s electrical charge builds up along the drop’s surface, providing an attraction that acts somewhat like surface tension. As a result, charged drops don’t lift off the surface as much and they spread less overall; both factors inhibit splashing.* The effect could increase our control of droplets in ink jet printing, allowing for higher resolution printing. (Image and research credit: F. Yu et al.; via APS News)

*Note that this only works for non-conductive surfaces. If the surface is electrically conductive, the charge simply dissipates, allowing the splash to occur as normal.

#dropletImpact #droplets #electricalField #electrohydrodynamics #fluidDynamics #lamella #physics #science #splashes #splashing

Two black and white images of a droplet impacting a surface. On the left, an uncharged droplet splashes. On the right, an electrically charged droplet spreads without splashing.
2025-05-03

Run: Photo; Loc: Washington Park Historic District in Albany NY; Date: 2025-05-03; Camera: Ollie(Olympus Stylus TG-860); Proj: Point and Go
Notes - The water on the petals looked cool.

2025-05-03
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Daisy in a drop.... I see many liked this photo. This is the uncropped version as it was taken.

Camera used was my old Nikon Coolpix S8000. Always have it with me. Quite versatile even if so old. It gets the job done.

#photography #nature #flowers #macro #droplets
2025-05-01
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Daisy in a drop...

#photography #macro #flowers #droplets

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