Fire Driven Sound Waves in a Quartz Tube

I'm curious if the space between each ripple in the flame could be determined by measuring the upward speed of the flame, and dividing it by the fundamental frequency of the tube. I at first was tempted to think that the ripples were another example of "sub peaks" in the sound wave as we saw in the foam bead experiment in part 2 of the thermoacoustic series, but after reconsidering I think it's more likely a factor of the slow moving flame being regularly impacted by the sound wave. Even so there are some curious things to consider, like why does the flame break apart in mid air? That doesn't seem to make sense unless the air movement of a sound wave is subdivided with nodes at the pinching off points. Very interesting to think about.

I see a thermoacoustic pipe organ in the future! Great stuff!

Life goals: Find a Significant other that looks at you the way NightHawkInLight looks at acoustic fire

5:00... so alcohol is wetter than water? I think this deserves a whole video

What do you think about watching this hot air movement with use of Schlieren Effect? This may give you some interesting results... :)

About a decade ago, when I was a kid, you got me into making my own fireworks with your videos on pyrotechnics. Today you're one of the highest quality educational video creator/producers. It's your accomplishment, but I'm proud to have been here watching the whole time :)

Those slowies were wicked! The flame may break apart in mid air, as nodal points might be compressing atmospheric air and replacing the flammable gas at those points. Really great viddy - and being off script was really fun to watch actually!

We DO appreciate your "casual" videos! Thanks for your dedication!

Wow, at 2:45 it sounded like an ocean liner. LOL Singing tubes are very cool. Great work as always!

I can just imagine you either sitting by your computer or in a shop, suddenly going all blank in the face as you see that tube. "I got to have that."

As a musician, I enjoy this a lot. Looked like a ton of fun. Frequencies and vibration have so many interesting effects it seems magical really.

Great video, Love the quartz tube allowing for such a great visual. I especially like the slow motion of the waves. Just curious, what was the length of the tube, did you mention it somewhere and I missed it? Also, it would be interesting to see how the actual frequency measures compared to calculated measurements. They tend to vary according to the temperature of gas inside the pipe. Any experience with Sondhauss tubes? I've dabbled with them a bit but haven't gotten anything near as good as the Rijke tubes.

u can say it has a warm tone to it

You're more concise off script than I am on script most of the time

Videos like this where you go off script are cool. It may not be as concise, but your demonstrative discovery is seen and I appreciate that kind of thing. Just look at SmarterEveryDay's new video where they're talking about magnetic worms. It's great to see someone talk unscripted about something they're genuinely curious and/or excited to talk about.

This gave me an idea: use this effect to make a musical instrument by putting resistive heating elements into tubes sized to produce different notes and control the whole setup from a computer or something

Enjoyed this immensely! Can you imagine When I was in my early 20's, I would take a plastic bread bag, tie it into a number of little knots,all cascading downwards and then suspended it above and over a pan of water. Then record the weird sounds that would emanate from it being set on fire (the tail of it) and dripping the melted plastic while it hit the water. Crazy sounds unlike anything I've been able to duplicate (to date).

Your videos are great. Thanks for brightening my day.

It's as if a pulse jet and a bassoon had a baby.

I believe that since the burner is venturi aspirated the flame is actually very, very sensitive to pressure fluctuations in the tube. It would be interesting to see this done with a burner that uses pressure fed oxidizer.