It’s (relatively) easy to get water droplets to move at terminal velocity. They don’t even have to be moving relative to you. Just get air flowing upwards fast enough, and the water will hover, without increasing its speed up or down. Then throw more water drops at it, and see what happens. »
This wonderful video, “Life at the Interface,” shows how insects who live on the water make use of, or get tripped up by, fluid dynamics. You can see insects shoot up towards the edge of a container or fall helplessly into one another. »
This doesn’t look impressive, but it is. It’s an up-close look at data collected on New Year’s Day in 1995—and it’s the first official evidence we have to show that “rogue waves” really do exist. »
This isn’t a computer-generated image. It’s an actual picture of what happened when NASA decided to test the air flow around an F-18 by putting a model plane, and a lot of dye, in a water tunnel. »
Here’s a fluid dynamics video that shows us a water droplet falling onto a hydrophobic needle. It’s pretty cool! Instead of spreading into a puddle, the drop turns into a hollow crown of moving water. »
Fifteen years ago, researchers used high speed video to show that when a drop of water coalesces into a layer of the same liquid, it does so not instantaneously but in a matryoshka-like cascade, with each step generating a smaller drop. Now, a newly published study finds that soap bubbles do something similar. »
Here’s a cool aspect of fluid dynamics that you might not have thought of before: When a shape is pushed into the water, it creates a space in its wake. As the space collapses, the shape inverts itself. »
Watch a bubble annihilate itself by stabbing itself, splitting in two, and then dissolving into two tiny clouds of bubbles. It’s quick, it’s beautiful, and, with the accompanying explanation, it’s weirdly intuitive. »
This experiment involves two liquids and a machine that will jiggle them. That’s all. So how does it create a family of “worms” that branch out from and interact with each other? Check out this incredible video. »
My thoughts, in order, upon viewing this drone footage of a “giant intake vortex” in an Oklahoma waterway: Hey, cool, a vortex! Wow, it is, indeed, giant looking. Big enough to swallow a person, surely. What would that be like? Dreadful, I bet. Wait, why am I sweating? Oh god. Oh god, it’s looking at me. »
This is so cool! Here’s a video that shows an ink drop getting hit, all of a sudden, by a laser. We can see what happens when the laser pulse is out of focus, and the drop is pushed. And we can see the drop get obliterated when it’s hit with a focused laser.
Worthington jets are the reason we must live in fear of splashback during all our water-related activities. A small object hitting the water can create a jet of water that shoots up. Here you can see it happening from both below and above the water. »
A quick tap on the top of a freshly-opened beer brings up a massive wave of fizz. This video lets you see how that happens, and tells you what’s happening inside the bottle.
Weird stuff happens when water hits hydrophobic substances. In this case, water and hydrophobic sand turn into a “liquid marble” in this video. It’s like watching the T-1000 get mobbed by fire ants. »
When denser river water flows into the ocean, it creeps along the bottom churning up sediments to create a turbidity current. For the first time, researchers caught a flood-triggered hyperpycnal flow in a murky, cloudy mess surging into the Gulf of Aqaba on video. »
This video is just water splashing on a hydrophobic surface in slow motion. That doesn't sound like much, until you see the first fifteen seconds, in which a water droplet smashes to pieces and comes together again like the liquid-metal Terminator.
Researchers at the MIT Department of engineering wanted to study the best ways to burrow through granular material. And in order to study the phenomenon, they looked at snakes, lizards, roundworms, and clams — and made some amazing videos, that it's hard to look away from. »
This slow motion video explains an phenomenon called "buckling instability" - the crimped edges of a splash of water. More importantly, it shows us how much familiar physics we don't notice until it's pointed out to us. »