thermoacoustic experiment

[salaciousBastard]

Has anyone tried to combine thermoacoustics with RMS (Resonant Macrosonic Synthesis). Carefully choosing the shape of a resonator allows for larger sound amplitudes. Industrial applications like pumps, refrigerators, and compressors that use sound to do work can be developed with RMS. A bulb shape is one of the types of resonators that produce RMS. I wonder would that work with thermoacoustics to get greater efficiencies or horsepower?

[KevinByrne2]

Specifically, the second and third devices are "Sondhauss tubes" with steel wool (instead of a bundle of glass tubes) serving as a heat exchanger

[KevinByrne2]

The first device (the metal pipe) was a Rijke tube -- a heat-powered sound generator. (Lord Rayleigh explained how it works.) The pipe acted as a half-wave resonator.

The second device (the glass cylinder) was also (very likely) a Rijke tube. The cylinder acted as a quarter-wave resonator. The third device (the test tube) was just a smaller version of glass cylinder.

[Magnetohydrodynamics]

These can be LOUD. Don't leave the heater under the tube for too long.

[TGGeko]

awesome, make a musical instrument now!

[onthecuttingedge2005]

you know, he would make a cool neighbor to have, I enjoy weird science.

[TheRealBoof]

agrd

[eddiequest2]

I'd like to see the other way around. Use the sound to make heat.

[Magnetohydrodynamics]

That happens all the time actually, when sound hits a surface it converts its energy partially to heat... Actually, most forms of energy can end up as heat, it's the other way round that's hard.

[moaninglory]

wats the fuckin point francois ??????????

I got a terrific experiment 4 U: stick that pipe up ur arse, BURN IT & let's find out whether or not the marseillaise comes out the other end

[SWINGREGORY]

great

[jhw76]

dull

dull

dull

[smokyatgroups]

The hot air movement is exciting the pipe to resonate, as a high Q tuned audio cavity resonator. The position of the gause maybe moved for optimal point to excite the air space inside. I think it needs a needs a temp differential to work & copper conducts heat too well to get the req. differential. The little foam beads try to gather at the nodes where the air speed in one direction is equal to the air speed in the opposite. Giving a nil total at that point. Standing wave effect.

[QntmCat]

378.5 - Frequency associated with spin of Earth. (Note=F#) [BH2]

[VideyoJunkei]

diff size tube=same pitch? no!

[QntmCat]

Perhaps. Just need to find, either the right size or angle even, of tube, pipe, or hose, to create the sounds your looking for. All is possible, mind willing.

[Fanman904]

I'm glad they put 'shaky joe' with the camera. Next time ZOOM OUT AND KEEP IT STILL!

[ReverendFlatus]

Agreed!

[mowerofdoom]

Good experiment! I was wondering whether you could attach a copper ring near the gauze on the outside of the metal pipe and supply heat through conduction. Do you think a cooled section would be needed too?

[reg2800]

Is this purely a thermodynamic effect, or is there something being burnt in the tube that causes the oscillation? What's the function of the gauze in the second experiment? Do you see this if you fill the tube with inert gas such as nitrogen or argon? (+ sorry if you explain it in the audio - I don't speak french!)

[wizardofkozz]

Look at Rijke Tube in Wikipedia. Nothing is burned. The gauze helps to hold the heat (a conductor) which then heats the air. The tube is open on both ends.

[NebulaBurst]

Thats a crackpipe

[HarryL77]

Reverse the process. Free heating for the people who live close to an airport. ;-)

[gaphary]

uhh, you cant.

or can you?

[r32adt3db]

Now that you've learning something about sound, why not learn about typography and HOW NOT PUT TEXT OVER BUSY BACKGROUND if you want your readers to be able to read it!!! I swear, you smart people have no @!(# damn creativity.

[gilbondfac]

yes ! sorry

[r32adt3db]

haha i'm just jossing you. Cool experiment, but yeah I can't read the font very well.

[MrfixitRick]

Nice thermoacoustic demo.

It's fascinating to watch a tube resonate from only the application of heat!