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What you have is esentially a nut and bolt.
is because of friction between the nut and the bolt
Are you saying that fluid pressure contained by the green line will make the screws turn?
QuoteAre you saying that fluid pressure contained by the green line will make the screws turn? No, I'm not saying that.I would like to know if for you the unique thread on reply #20 (drawing) turn and give torque ?
ok, the screw turn and give torque, the sum of energy is 0 and there is friction.
There is no need to go any further.
What is suppsed to happen when the screws are rotated?
The screws enclose a constant volume of gas even when they are rotated by an external force. It's just the same as the gas inside a sealed bottle. Differential pressure won't do anything uless you allow the gas to expand.