11–20 of 21 posts
That said, I wonder if such an experiment would be better with PIV or even Schlieren as there would be no need to refill the tank each time.
3 years is a long time. I appreciate that people like this exist.
cough We were smoking a lot of... various things. I had setup a chill room that didn't have any air conditioning (so it was actually very hot; a hot box if you will). Just a small room where smoke would accumulate.
At any rate, I got very good at blowing smoke rings. In the still room, you could blow a smoke ring and it would expand for about a minute before dissipating. The more substantial rings would do something really crazy. They'd spawn a new, smaller ring, but going the opposite direction. I believe this was only the case if the ring was blown upward.
I don't know if this is related to the Two Vortex Ring Collision experiment, but it was definitely fun to watch!
This comment would have been better with a whiteboard.
I used to notice something similar in college. cough We were smoking a lot of... various things. I had setup a chill room that didn't have any air conditioning (so it was actually very hot; a hot box if you will). Just a small room where smoke would accumulate. At any rate, I got very good at blowing smoke rings. In the still room, you could blow a smoke ring and it would expand for about a minute before dissipating.…
Can this be recreated accurately using something like blender?
The reason for the secondary rings, and the explanation for their outward travel, is a straightforward application of potential flow, namely that lines of vorticity induce rotational motion that falls off at 1/r. As the rings approach each other, they induce outward motion, and any instability or imperfections in the rings cause closer points between the two rings to induce more motion. With a bit of mental squinting…
Actually, I think you nailed it. I'm no physicist, but you made the mechanism behind it very clear and intuitive :)
I used to notice something similar in college. cough We were smoking a lot of... various things. I had setup a chill room that didn't have any air conditioning (so it was actually very hot; a hot box if you will). Just a small room where smoke would accumulate. At any rate, I got very good at blowing smoke rings. In the still room, you could blow a smoke ring and it would expand for about a minute before dissipating.…
Vaping and youtube has taken smoke ring blowing to new level https://youtu.be/zVXR7xttUeo