Which bottle will empty first bottle with long straw or bottle with short straw?
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A moment ago, I was emptying bottles filled with water (2 liters) that are on the terrace of my house. As I did so I remembered something I saw on TV a some time ago (I don't remember when or where or exactly what) but I made a move on the horizontal plane as if the bottle drew a circle several times.
To my surprise, after several laps, a vortex was formed and the bottle did empty in half the time than those that are simply put upside down.
I repeated the experiment 20 times to be sure, and always got the same results.
Bottle upside down: 20 seconds. (approx)Bottle upside down and rotation to form a vortex: 10 seconds (approx)
Clearly the vortex allows air to enter the bottle faster than in the other case.
I would like to understand what happens in physical terms.
EDIT:
Another interesting fact is that in the first 6/7 seconds just the first liter is gone. And in just two seconds (after the vortex is formed) the remaining water goes fast, very fast.
To my surprise, after several laps, a vortex was formed and the bottle did empty in half the time than those that are simply put upside down.
I repeated the experiment 20 times to be sure, and always got the same results.
Bottle upside down: 20 seconds. (approx)Bottle upside down and rotation to form a vortex: 10 seconds (approx)
Clearly the vortex allows air to enter the bottle faster than in the other case.
I would like to understand what happens in physical terms.
EDIT:
Another interesting fact is that in the first 6/7 seconds just the first liter is gone. And in just two seconds (after the vortex is formed) the remaining water goes fast, very fast.
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