Pear Shaped Episode 1: Liquid CO2
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- čas přidán 5. 12. 2016
- I tried to replicate the experiment from Cody's Lab where he created liquid CO2 at room temperature using the expansion of dry ice trapped in a glass tube. It did not go well.
Cody's video: • Supercritical CO2 in a...
Patreon Page: / chrisdeprisco - Věda a technologie
I like your use of a pipe as a safety mechanism.
Quick tip: don't let the tubes "bubble" at the end - heat it up, and quickly close it with pincers made out of graphite.
Graphite is a terrible heat conductor, won't freeze the tube mid-pinch, and it's really cheap to get blocks of, to machine or simply chip away into the shape of a tool - I recommend making "cups" for pliers, with a slight negative angle, so it pinches evenly at ~3-4mm..
I used a piece of graphite to kind of smush the end but I didn't have any in the form of pliers. I have some other ideas if (when!) I try again, but I only had the four tubes to play with.
Seems like the bubbled ones performed the best. I would think to that they would because they evenly distribute the stress (like cylindrical pill shaped pressure vessel or spherical opposed to box shaped). Corners have high stress areas and theoretically the exact corner would have infinite stress (but obviously is rounded microscopically)
Right, at least that was my thought, too. The big bubble one was probably too thin but I was trying to get them all to have a nice round end. I've got some other ideas to try next time as well.
Chris DePrisco Well thanks for the video and as always be careful. This reminds me of 1800's when they were racing to liquefy hydrogen for first time. People losing eyes etc. by exploding beakers haha.
Chris DePrisco The problem with the bubble is that it gets thin. Dangerously thin.
You have to pinch it off to make the ends thicker than the walls.
I've previously watched your CNC construction videos and they were great.
But this new "Pear Shaped" series looks like it could be really cool... If you don't mind the comparison, it kinda reminds me of "Applied Science" meets "AvE".
Looking forward to learning from some more of your failures.
I kinda wanted to do this experiment too after I saw codys experiment, although (hard to tell without a scale) it looks like the glass tube you used is about 2X the diameter cody used so the max pressure will be less that half of the 5000psi that cody used. That gives you only about an engineering factor of 2..... you need a smaller tube or a much thicker walled tube and the old welding trick (bury it in sand) to slow down heat transfer might help
I dont know why i enjoy your videos so much...
but my favorite is the portal laser
it make me shake of nostolgia
I don't like it when he has his hand in line with the "bore" of the safety tube.
Heating the end of the tube looks to be a problem. perhaps better to seal the tube by softening part way along the tube and drawing it, to get it far more narrow before sealing. Half the heat would go with the spare end, for a start and less glass to melt at the seal. I'm not a glass blower, but that is my take on it.
Way to make someone crap their pants #396: Fill a borosilicate glass tube with high pressure CO2 and wait for it to explode unpredictably.
This is not advised.
More commentary would help with time lapse. You could explain why/what you are doing this during a time lapse vs having it on screen in text. I would also recommend more lights if you plan on doing more vids like this. Overall I would watch more.
Good notes. I definitely need more lights; I'm working on that. :)
I believe the sand trick should do it and you might want a hotter flame.
What effect do you think the sand would have over letting it cool in the air? I used an oxy-MAP-PRO torch at nearly 5,000 degrees F (so their datasheet claims). How much hotter do you want?! lol
Chris DePrisco it may help with the transfer of heat and allow the seal to fully cool before the rising pressure inside the tube deforms the hot end. I'm just giving my observation, I'm not a scientist lol.
74 bar.
Tres bon tube.
Kinda obvious but that's WAY too much dry ice being added
+x9x9x9x9x9 live and learn! Lol
Some thicker walled tube would give you less trouble. a.co/6IGTkES Burying the tubes in sand, like Cody did, would probably also give better results. The sand will allow the tube to warm up a more slowly, so less chance the tube will burst from a rapid pressure change. This is especially important since glass tube isn't rated for this kind of pressure.
Those are actually the same wall thickness as what I used, 2mm. Although those are slightly more narrow (mine were 12mm OD 8 ID). I'm trying to find 4-5mm wall thickness tubes at about 15mm OD, so if anyone finds any let me know!
I'll try the sand next time, too.
Those look much thinner than the tubes I have. Must be the perspective in the video. In any case, I think the sand will help.
I can't find 4mm wall at 15mm OD. I did find 3mm wall (in quartz, so stronger) at 16mm OD.
fusedquartz.qsiquartz.com/item/clear-fused-quartz-tubing/clear-fused-quartz-tubing-2/100010e
Quartz glass is neat stuff. It laser marks very well. $65 for that tube though; kinda a lot just to play with.
I'd split it if you were near Austin.
Aww man bad luck, well if at first you don't succeed, try and explode more tubes.
Format is pretty good, for a bunch of fails, don't see a reason to explain the process, unless people want a sure way to cover things in glass shrapnel.
14:14 hehe gee, I wonder what's going to happen. :P
** pop! ** Sorry, got a good laugh with that one ^^ 16:51, freakin' bejebus
Yes, we require more dangerous experiments! (For science!) :D
Looks like you are learning the technique to making meth pipes! ;-)
Quit making crack pipes and get back to working on the mill!
I just picked up some sheet steel for the next step on it this morning! I'll have another video soon.