Choose parameters for a system

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SUMMARY

This discussion centers on selecting optimal parameters for a theoretical system involving rotating disks. Key parameters include density, radius, rotational speed, and the positioning of d3 and gas within the disks. The consensus is that achieving the desired forces as illustrated in the user's drawings is not feasible due to the principles of centrifugal gravity and the impossibility of perpetual motion. The size of the disks is irrelevant as long as sufficient rotation is achieved to create pressure variations with radius.

PREREQUISITES
  • Understanding of centrifugal force principles
  • Knowledge of fluid dynamics and buoyancy
  • Familiarity with rotational mechanics
  • Basic concepts of gravitational effects in rotating systems
NEXT STEPS
  • Research the principles of centrifugal force in rotating systems
  • Study fluid dynamics, focusing on pressure variations in rotating fluids
  • Explore the concept of buoyancy in relation to density and drag effects
  • Investigate the limitations of perpetual motion machines and their implications
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This discussion is beneficial for physicists, engineers, and students interested in rotational dynamics, fluid mechanics, and theoretical physics concepts related to gravity and motion.

Gh778
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Theoretical study. Disks are one above the other. Turn at same rotationnal speed [itex]w[/itex].

Is it possible to choose good parameters for:

- density
- radius
- rotationnal speed
- position of d3/gas: d3 in disk1 at radius R1, d3 in disk2 at radius R2, gas in disk1 at radius R2, gas in disk2 at radius R1
- size of disk

For have forces like I drawn on the system ?

NB: disk must be big enouh for have gravity effect (1000 km for example). Center of rotation is supposed fixed.
 

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No - there are no easy choices of parameter that will produce the results you have drawn.
BTW: the green one is nonsense.

Looking at the blue one:
I can see what you are doing - you think the buoyancy and weight will add to a net tangential force.
Centrifugal gravity does not work like you seem to be thinking.

You realize this is perpetual motion?
Therefore it does not work...

Some notes:
It does not matter how big the disks are - all you need is enough rotation to get the pressure of the liquid to vary with the radius so it is highest at the rim... and you want the blue liquid to be light enough to have zero drag effect.

Make sure you have included all the forces.
 
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Since the time I posted the thread I understood. thanks for your help.
 

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