Fire Driven Sound Waves in a Quartz Tube

Also check out the other videos so far in my thermoacoustic series:

Thanks for watching!
-Ben

[Nighthawkinlight]

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.

[ElementalMaker]

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

[gummybread]

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

[PlasmaChannel]

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!

[LittleGreenFire]

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 :)

[Grudzin]

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

[mariosebastiani]

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

[nicknack]

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

[electronicsNmore]

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."

[TonyOnekaNobY]

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.

[Genny]

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.

[johnsaucerhunter]

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).

[gramursowanfaborden]

thank you for being one of the few people not making an april fools video.

[YeanyScience]

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.

[CamStLouis]

Man, has anyone else noticed how good NightHawk's cinematography has gotten over the past few years? These are some of my favorite videos to relax with (like the Tesla Valve video). The combination of visually striking phenomena on a clean background with a smooth, pleasant voiceover is just great, plus learning something interesting is a nice distraction from the world going off a fucking cliff.

[jasonpatterson]

I've been subbed (on another account) and watching your channel for almost a decade now, and I appreciate how well you interact with your community. You are open to constructive criticism and suggestions in a way that most science YouTubers are not, and it's very welcome. Keep up the great work!

[Mr.Pidgeon]

Please never change, I'd rather see 1 great video than more not as great, and I'd hate to see another king of random, started out strong, but did too much and got burnt out

[emorag]

Your videos are great. Thanks for brightening my day.

[moreda]

Thanks for discovering and presenting without a script. In response to your comment at the end of the video about not using a script for this video, I want to say that I enjoy and learn from watching and hearing the discovery process as with this video. It was great!