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Pressure forces from a liquid in rotation

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Hi,

A liquid in rotation give two kind of forces:

1/ centripetal
2/ pressure forces (Fa, Fb in the drawing)

I'm ok that centripetal forces can't give energy (we lost kinetics energy) but Fa/Fb seems in direction to external circle, why it's not possible to recover energy from these forces ?

Liquid in the drawing don't move in the center, it's put at same place (same velocity) but don't return to the center.

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