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Shredding Gold
While vacuums can do pretty wild things to liquids, the title of this Slow Mo Guys video is a bit misleading. They're not so much exploding gold in a vacuum as they are shredding it during repressurization. Regardless, the visuals are pretty awesome. (Video and image credit: The Slow Mo Guys) Read the full article
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If you can’t handle Ibuki at his dad-slob you don’t deserve him at his smoulder.
I’m aware that there is some tension here between which one is the more sexually charged one depending on peoples’ preferences lol.
Recirculation/Repost, tagged as such.
Detail of Fractal Fountain, my newest painting done for #crimeoncanvas @lifeisbeautiful music and art festival! 15" x 30", Oil on Wood Panel. Curated by @mmoderngallery and includes art by @joesorren @marionpeck @markryden @obeygiant @nataliafabia @buffmonster @brandimilne @glbarr @amysol @travislouie and many more!! I will have a full pop up shop all weekend long during the event as well!! September 22nd to 24th at the Western Hotel in Downtown Las Vegas. #oils #fractals #recirculation
Spinning Tops
What does the flow look like around a spinning top? Here, researchers used dye to visualize what happens in a Newtonian fluid (like air or water) as well as a viscoelastic fluid. (Image credit: B. Keshavarz and M. Geri) Read the full article
Tea is a popular beverage around the world, and nearly everyone has their own method for making the perfect cup. Perhaps unsurprisingly, scientists have studied tea physics as well. One such study used both experiments and numerical simulations to study tea infusion from teabags. The authors looked at round, two-dimensional teabags in two configurations -- one in which the bag was left still during infusion and one in which the bag was dunked up and down in the water.
In the static case, as the hot water leeches solutes out of the tea leaves, it forms a buoyant convection current. In this case, the convection is driven by solute concentration, not temperature. The convection creates a re-circulation in the cup that helps slowly distribute the tea solutes.
The dunking method, unsurprisingly, distributes tea solutes much faster. In addition to stirring the cup’s contents, dunking helps drive flow through the tea leaves, releasing solutes faster. Although the authors study the two methods in detail, they decline to pass judgement on what method is “the best”. (Photo credit: T. Foster, source; research credit: G. Lian and C. Astill; submitted by Marc A.)
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When a droplet falls on a pool, we expect it to coalesce. There are exceptions, like bouncing droplets, but in general a droplet only sticks around for a split second before being engulfed. And yet, from morning coffee (top image) to walks in the woods, we frequently see millimeter-sized droplets sticking around for far longer than it seems like they should. New research offers a clue as to why: it’s thanks to a temperature difference.
When there’s an appreciable temperature difference between the drop and the pool, it causes rotating convective vortices (bottom image) in both the drop and the pool. When the temperature difference is large, the vortices are strong enough that their motion recirculates air inside the tiny gap between the drop and the pool. This supports the weight of the drop and keeps the two liquids separate. But the convection also redistributes heat, and eventually the drop and pool become similar enough in temperature that the circulation dies out, the air gap drains, and the two coalesce. (Image and research credit: M. Geri et al.; via MIT News; submitted by Antony B.)
A cylinder standing upright in a flow creates a complicated system of vortices and recirculation. In the photo above, the flow is left to right. The cylinder itself is somewhat hard to see but is located in the center of the image; we see it from above. The colored streaks of dye show the flow path around the cylinder. In yellow, we see a spiraling vortex that forms just ahead of the cylinder and stretches downstream on either side. Because of its shape, this is called a horseshoe vortex. Its sense of rotation is such that it tends to pick up loose material in front of the cylinder; in other words, it can erode that area. This is often seen around the pilings of bridge supports and must be accounted for in designs. You also see the effects of this horseshoe vortex digging out material at the base of trees after snowfalls in areas with a dominant wind direction, and here’s an example with a snow roller. (Image credit: H. Werlé; via eFluids)
HEY
So I had to repost The Magic Of McCoy because it had been hit by the ban. If you had already read it or viewed it, all of your likes and comments were lost. If you can go through and recirculate it, I would appreciate it. Thank you!
