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I recently saw an experiment in youtube (vortex collision experiment of 1992 recreated). I found it very impressive and I was wondering if someone can give me a brief explanation, since in the internet there are many detailed documents with unclear results. If someone have an idea why this is happening, is pleased to write it. (In the video is said that pressure may cause it, but it does not explain it well.) A specific question I have is related to the number of rings that are created. Is it the same number everytime despite the speed or/and the size of vortex?

Two Vortex Rings Colliding in SLOW MOTION - Smarter Every Day 195

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    $\begingroup$ Are you looking for a detailed, thorough explanation, or just an overview of the types of physics that are involved? $\endgroup$ – Emilio Pisanty Jun 22 '18 at 17:06
  • $\begingroup$ "...in the internet there are many detailed documents..." Please add references. $\endgroup$ – Deep Jun 24 '18 at 4:27
  • $\begingroup$ I am looking for a brief explanation. But my curiosity is more related to the number of rings created. It seems to me like there is always the same number, but I am not so sure... As for references, you can watch the video, they are mention there. $\endgroup$ – Indrit Kello Jun 24 '18 at 22:30

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