Acoustic levitation of water droplets


These water droplets are not falling; they’re actually stuck in place. What we’re seeing is the effects of an acoustic levitator. The device was initially developed by NASA to simulate microgravity. Now it’s being used by the pharmaceutical industry do develop better drugs.

The two parts of the apparatus seen in the image above are both speakers. They put out a sound at about 22 kHz, which is beyond the human range of hearing. When precisely aligned they interfere with each other and create a standing wave. The droplets are trapped in the nodes of that wave.

So are these guys just playing around with the fancy lab equipment? Nope. The levitation is being used to evaporate water from a drug without the substance touching the sides of a container. This prevents the formation of crystals in the solution. But we like it for the novelty and would love to see someone put one of these together in their home workshop.

Don’t miss the mystical demo in the clip after the break.

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Single-column Rubens’ tube

Here’s a fiery project which [Patrick] calls his Pyro Jam Can. It’s the simplest Rubens’ Tube build that we can think of. For the uninformed, a Rubens’ tube uses flammable gas to reveal wave forms passing through the supply vessel. In the past we’ve seen projects with multiple columns, which very clearly show a standing wave. But this version lacks the resolution for that, so the wave is seen as a modulated flame height.

You can see the propane feed tube coming into the can from the right. This keeps the gas flowing steadily, but a diaphram on the bottom of the can made of a latex balloon allows for modulations in flame height by pushing the gas through the aperture a bit faster than it is flowing. A speaker in the base bounces sound waves off of the diaphragm for the effect seen in the video clip after the break.

We wonder if the can will ever heat up enough to melt the balloon on the other end?

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Real Time searching

reallivesearch (Custom)

With the fresh competition of Bing, we are reminded that search engines haven’t changed much since Google came along. Bing has made some nice advancements, like video previews, but still has a way to go to be truly different than Google. [Long]put together this prototype of a real time search system based off of Bings API. He was inspired by Google Wave which we hope to see soon. Wave is primarily for communication, redefining how email and messaging would work. We can’t help but think that Google probably has some cool stuff in the secret vaults for searching too.  [Long]‘s project seems like a decent start, but like the goodtimes.searchengine, we think it needs some work. What happened to the cool video previews? More importantly, why can’t we turn off the parental filter?