Gallery, Projects and General > Neat Stuff

Not really an engine

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DavesWimshurst:
This demo is to be worked into a show at Scitech, the science museum where I work.  Here is Mary Hawthorne dumping boiling water into about 20 liters of liquid nitrogen as a finale to her show.



This is another part of the show involving liquid nitrogen and a 2 liter pop bottle.  Note this must be done in a special manner involving putting water in the bottle to delay the action.  Definitely not to be done by the untrained, very scary.  Mary has had years of experience doing these kinds of shows, mostly for Fermilab.



We now use a blast shield in front of the box, but this is my best video.

In answer to Chris's question Mary uses the LTD Stirling engine I made for her for demos with kids using their hands to generate the needed heat.



Close up of the flywheel.  Kids love it!



Dave

Brass_Machine:
Dave,

You work at a museum? How very cool is that? I saw a job once at a museum in California where they guys make some of the displays etc... They had a very nice work shop etc...

Me? I work for a college!

Eric

raynerd:
David

We don`t often have liquid nitrogen but we do a similar experiment to the exploding bottle with a smaller drinking bottle containing dry ice which we can make on top from a dry ice valve on the CO2 bottle. Same idea, something else I like to do is place small amounts of dry ice into eppendorfs and then throw a handful on the floor. They all go off like little fire crackers at random times. Not quite as explosive as the (what looked to be) a 1 litre bottle full of liq. nitrogen.

I really like the idea of stirling engines but I`m trying to find a reason or area of the curriculum that it could be related to. I understand it would be a nice demo of science and technology alone but I think if it could be incorperated into an area of the curriculum all the better. Energy and energy resources? ... any links there?

Chris

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