Undergrad How do I calculate brake force for an eddy current brake?

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To calculate brake force for an eddy current brake, determining the frequency and characteristic length is crucial, specifically the skin depth and magnetic Reynolds number. The discussion includes shared equations and a model scheme to aid in the calculations. Participants are encouraged to refer to the linked thread for additional insights and references. Understanding these parameters is essential for accurate brake force calculations. The conversation focuses on the technical aspects of modeling eddy current brakes effectively.
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I try to calculate brake force for primitive eddy current brake, but I have problem with determining the frequency (skin depth) and characteristic length (magnetic Reynolds number)
Hello everyone, I try to calculate brake force for primitive eddy current brake, but I have problem with determining the frequency (skin depth) and characteristic length (magnetic Reynolds number). I attach the equations and a scheme of the model.

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Scheme.png
 
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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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