fuckyeahfluiddynamics:

Underwater explosions are, in general, much more dangerous than those in air. This video shows an underwater blast at 30,000 fps. During the initial blast, a hot sphere of gas expands outward in a shock wave. In air, some of the energy of this pressure wave would be dissipated by compressing the air. Since water is incompressible, however, the blast instead moves water aside as the bubble expands. Eventually, the bubble expands to the point where its pressure is less than that of the water around it, which causes the bubble to collapse. But the collapse increases the gas pressure once more, kicking off a series of expansions and collapses. Each bubble contains less energy than the previous, thanks to the loss of pushing the water aside. (Video credit: K. Kitagawa)

If you needed something to make a science GIF out of this weekend, here’s a good subject.

Whoa.

(via thescienceofreality)

Source: fuckyeahfluiddynamics

fuckyeahfluiddynamics: A buoyant plume of smoke rises from a stick of incense. At first the plume is smooth and laminar, but even in quiescent air, tiny perturbations can sneak into the flow, causing the periodic vortical whorls seen near the top of the photo. Were the frame even taller, we would see this transitional flow become completely chaotic and turbulent. Despite having known the governing equations for such flow for over 150 years, it remains almost impossible to predict the point where flow will transition for any practical problem, largely because the equations are so sensitive to initial conditions. In fact, some of the fundamental mathematical properties of those equations remain unproven. (Photo credit: M. Rosic) Is there anything more unpredictably beautiful than whorls of smoke?
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fuckyeahfluiddynamics:

A buoyant plume of smoke rises from a stick of incense. At first the plume is smooth and laminar, but even in quiescent air, tiny perturbations can sneak into the flow, causing the periodic vortical whorls seen near the top of the photo. Were the frame even taller, we would see this transitional flow become completely chaotic and turbulent. Despite having known the governing equations for such flow for over 150 years, it remains almost impossible to predict the point where flow will transition for any practical problem, largely because the equations are so sensitive to initial conditions. In fact, some of the fundamental mathematical properties of those equations remain unproven. (Photo credit: M. Rosic)

Is there anything more unpredictably beautiful than whorls of smoke?

The physics of fluid, revealed in spellbinding color by artist Fabian Oefner. The exotic fluid dynamics of paint splattering off of a rotating drill are captured frozen in time using high-tech flash technology. The whole thing is over in approximately 1/40000th of a second. Check out io9 for a little fluid dynamic explanation and check out more from Oefner here.
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The physics of fluid, revealed in spellbinding color by artist Fabian Oefner. The exotic fluid dynamics of paint splattering off of a rotating drill are captured frozen in time using high-tech flash technology. The whole thing is over in approximately 1/40000th of a second.

Check out io9 for a little fluid dynamic explanation and check out more from Oefner here.

Source: io9.com

Using nothing but soap and a macro lens, Janet Waters photographs mesmerizing patterns on colored backdrops. But she hasn’t stopped there, she’s using her Flickr to create a “visual library” for all of her University students. Packed with experimental photo projects galore, her stream is well worth a look.  Macro Photography Series of Colorful Bubbles and Foam via Zeutch  Bubbles are funny things. And they do especially funny things in threes. When they roll solo, their natural tendency is to form a sphere. But it turns out that when bubbles are squished together, they prefer to be in trios. When three bubbles come together, they are snug as bugs in rugs. Take a 360˚ round bubble and divide it into threes. What do you get? You get three 120˚ angles. Now look at those pictures up there again … Most of those intersections are pretty close to 120˚!! Check out this image from Robert Krulwich:
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Using nothing but soap and a macro lens, Janet Waters photographs mesmerizing patterns on colored backdrops. But she hasn’t stopped there, she’s using her Flickr to create a “visual library” for all of her University students. Packed with experimental photo projects galore, her stream is well worth a look.  Macro Photography Series of Colorful Bubbles and Foam via Zeutch  Bubbles are funny things. And they do especially funny things in threes. When they roll solo, their natural tendency is to form a sphere. But it turns out that when bubbles are squished together, they prefer to be in trios. When three bubbles come together, they are snug as bugs in rugs. Take a 360˚ round bubble and divide it into threes. What do you get? You get three 120˚ angles. Now look at those pictures up there again … Most of those intersections are pretty close to 120˚!! Check out this image from Robert Krulwich:
Zoom Info

Using nothing but soap and a macro lens, Janet Waters photographs mesmerizing patterns on colored backdrops.

But she hasn’t stopped there, she’s using her Flickr to create a “visual library” for all of her University students. Packed with experimental photo projects galore, her stream is well worth a look. 

Macro Photography Series of Colorful Bubbles and Foam

via Zeutch 

Bubbles are funny things. And they do especially funny things in threes.

When they roll solo, their natural tendency is to form a sphere. But it turns out that when bubbles are squished together, they prefer to be in trios. When three bubbles come together, they are snug as bugs in rugs.

Take a 360˚ round bubble and divide it into threes. What do you get? You get three 120˚ angles. Now look at those pictures up there again …

Most of those intersections are pretty close to 120˚!! Check out this image from Robert Krulwich:

(via decadentscience)

Source: photojojo

Bubbles Popping at 18,000 fps? Yeah, it’s as awesome as you think. Check out this new vid from the Slo-Mo Guys to see some crazy fluid dynamics at work. The world’s a very cool place at time scales beyond our own perception. For some of the science behind why bubbles form, take a look at this post. The Slo-Mo Guys do a cool experiment to see whether a dropped object passes through the bubble thanks to gravity faster than the bubble pops. What do you think would happen?
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Bubbles Popping at 18,000 fps? Yeah, it’s as awesome as you think. Check out this new vid from the Slo-Mo Guys to see some crazy fluid dynamics at work. The world’s a very cool place at time scales beyond our own perception. For some of the science behind why bubbles form, take a look at this post.

The Slo-Mo Guys do a cool experiment to see whether a dropped object passes through the bubble thanks to gravity faster than the bubble pops. What do you think would happen?

Plink. There are few things more beautiful in their simplicity than the rebounding columns of water that result from droplets hitting a larger body of liquid. It’s something we’ve all seen, time and time again, from raindrops to leaky sinks. With the advent of modern technology, we are able to see beyond normal time, and capture these transient moments on a scale of time and space without which we could not appreciate their brilliance. How this beauty works: That particular shape, the droplets that rise up when another droplet strikes the pool, is called a “backjet”. The force of a falling droplet divides the liquid it falls into, creating a void and exerting pressure on the liquid around it. The molecules of water rush back together at high velocity, driven by surface tension and reacting to the pressure exerted by the displaced liquid. When that tiny hole snaps back together, the force drives excess water upward, creating the beautiful “backjet” you see here. Along the edge of the flat, mushroom-like cap, tiny sub-droplets are breaking off in an almost fractal manner, each driven to division by an outward force that pinches them off and overpowers the surface tension. See more of Markus Reugels’ stunning droplet photography at Colossal. 
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Plink.

There are few things more beautiful in their simplicity than the rebounding columns of water that result from droplets hitting a larger body of liquid. It’s something we’ve all seen, time and time again, from raindrops to leaky sinks. With the advent of modern technology, we are able to see beyond normal time, and capture these transient moments on a scale of time and space without which we could not appreciate their brilliance.

How this beauty works: That particular shape, the droplets that rise up when another droplet strikes the pool, is called a “backjet”. The force of a falling droplet divides the liquid it falls into, creating a void and exerting pressure on the liquid around it. The molecules of water rush back together at high velocity, driven by surface tension and reacting to the pressure exerted by the displaced liquid. When that tiny hole snaps back together, the force drives excess water upward, creating the beautiful “backjet” you see here.

Along the edge of the flat, mushroom-like cap, tiny sub-droplets are breaking off in an almost fractal manner, each driven to division by an outward force that pinches them off and overpowers the surface tension.

See more of Markus Reugels’ stunning droplet photography at Colossal. 

fuckyeahfluiddynamics:

If you find yourself some place really cold this holiday season, may I suggest stepping outside and having some fun freezing soap bubbles? The crystal growth is quite lovely, as seen in this photograph. If you live in warmer climes, fear not, you can always experiment in your freezer. It would be particularly fun, I think, to see how a half-bubble sitting on a cold plate freezes in comparison to a droplet like this one. (Video credit: Mount Washington Observatory)

Freezing soap bubbles is one if the few reasons I can think of to wish for truly freezing temperatures. Go do this!!!

Food Coloring, Fluid Dynamics, and an Awesome Lab Demo

This video starts out in a fairly innocuous way. Some colored drops of corn syrup are slowly mixed by a rotating cylinder. Ho-hum, right? 

Well, wait until you see what happens when the handle is turned backwards. This is all a demonstration of how certain liquids can flow without turbulence, and how delicate hands can disassemble and reassemble the “sheets” of colored liquid. 

Wow, indeed.

Want to know more about the properties of laminar flow that make this possible? Check out Science-Based Life.

Source: sciencebasedlife.wordpress.com