Undergrad Infinite flow with capillary tubes?

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The discussion centers on the capillary tube phenomenon and its implications for infinite water flow. The idea of creating an infinite loop by bending a second tube into a first raises questions about conservation of energy. However, it is clarified that surface tension must overcome gravity for flow to occur. If surface tension is strong enough to lift the water, it will prevent drainage, negating the possibility of infinite flow. Ultimately, the concept of a perpetual motion machine remains impossible due to these physical limitations.
Warp
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I was watching this YouTube video by the channel The Action Lab:

At one point it shows this capillary tube phenomenon:

capillary_tubes.jpg


It got me immediately thinking: Conservation of energy much?

What's stopping that second tube from being bent into draining into the leftmost tube, thus creating an infinite loop of flowing water, which ought to be impossible because conservation of energy and stuff? If that were done, would there be some other phenomenon stopping the infinite flow of liquid? A perpetual motion machine shouldn't be possible.
 
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Warp said:
A perpetual motion machine shouldn't be possible
It isn’t.

If the surface tension is stronger than gravity to lift it up then it is strong enough to keep it from draining. There will not be any flow
 
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Thread 'What is the pressure of trapped air inside this tube?'

Thread 'What is the pressure of trapped air inside this tube?'

As you can see from the picture, i have an uneven U-shaped tube, sealed at the short end. I fill the tube with water and i seal it. So the short side is filled with water and the long side ends up containg water and trapped air. Now the tube is sealed on both sides and i turn it in such a way that the traped air moves at the short side. Are my claims about pressure in senarios A & B correct? What is the pressure for all points in senario C? (My question is basically coming from watching...
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