Discover Top Posts Tagged with #cavitation

Crowned Jets

If you fill a test tube with water and drop it, the impact causes a pressure wave that travels up from the bottom and creates a focused jet (left). (Image credit: H. Watanabe et al.)

#2025gofm #cavitation #fluid dynamics #jets #physics #science #water impact

Peacock Mantis Shrimp!

These little guys are only about 8 inches long at most (mantis shrimp in general are pretty small with the largest of the 400 species, the zebra mantis shrimp being about 15 inches). They live on the seafloor typically in warm, shallow waters like coral reefs.

Now for the crazy shit.

They have an estimated punch speed (yes punch) of 50 mph!! With an impact and acceleration similar to a goddamn bullet. AND NOT ONLY THAT when they punch something called cavitation happens.

Basically cavitation is when small bubbles filled with gas form and when they collapse they release extra heat and light energy. Aka basically bombs.

So to recap. These shrimp punch like a literal bullet and make bombs at the same time. Absolutely wild. They can do this because they have spring loaded joints.

Something else incredibly fun about them is that they have anywhere between about 12-16 photoreceptors (humans only have 3) which mean they can see colors we can’t even imagine. They can also detect polarized light (I would explain if I could but I have no idea my guys it’s light that has waves that vibrate on a single plain so says google idk). Each eye can see in 3 dimensions by itself, independent of each other. (Kind of like seahorse eyes but I’ll post about them later)

But this also means they can see more colors than any animal and they use this to communicate with each other. They do this with special patches on their shell that reflect light and flash colors only other mantis shrimp can see.

And they look LIKE THIS

Fucking gorgeous

#mantis shrimp #peacock mantis shrimp #marine biology #i love them #like they are so cool and I go feral #biology #ocean #I don’t know how to tag #is it obvious yet what my special interest might be #ocean biology #marine life #cavitation

Researchers have developed a novel method of 3D printing that uses acoustic holograms. The process is called holographic direct sound printi

Researchers at Concordia have developed a novel method of 3D printing that uses acoustic holograms. And they say it's quicker than existing methods and capable of making more complex objects. The process, called holographic direct sound printing (HDSP), is described in a recent article in the journal Nature Communications. It builds on a method introduced in 2022 that described how sonochemical reactions in microscopic cavitations regions -- tiny bubbles -- create extremely high temperatures and pressure for trillionths of a second to harden resin into complex patterns. Now, by embedding the technique in acoustic holograms that contain cross-sectional images of a particular design, polymerization occurs much more quickly. It can create objects simultaneously rather than voxel-by-voxel.

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