Hi I just found out an effect in rotating gas that I found interesting. http://arxiv.org/abs/1004.2421
It can apply to atmospheres on planets and gas centrifuges and any rotating mass with adiabatic heat gradient like liquids and solids? (I am not totally sure for solids. I have spend a lot of time thinking about it and I get nowhere. In solids there will not be a shear flow but there should be a shear strain? Please elaborate. The case is not very different from Euler buckling.) What is the reason they mention speed of sound as a limit for gas centrifuge operation? See http://en.wikipedia.org/wiki/Gas_centrifuge I think the limit is based on the effect I mention and that it causes turbulence beyond a certain speed due to the torque causing shear flow that gets turbulent past a certain Reynolds number. The adiabatic heat gradient will also cause strong temperature increase in the centrifuge causing higher diffusion and thus mixing to become high. Convection will also be the case since the end of the cylinder will cause heat conduction. There will also be a speed up of rotation in the ends of the cylinder because of drag causing the flow to be even more complex. If all these effects could be calculated and remedied or prevented maybe a one million g gas centrifuges could be built. One million g is the strongest desktop centrifuges sold. The adiabatic heat gradient in air with one g is 10 K per km would then be 10 K per mm. On a cylinder with 0.1 m radius thats an average a temperature difference of 500 K. If the outer side of the cylinder is kept at room temperature the inner would be colder than absolute zero..? I suppose some other effect is present too. But gradient would be even higher when gas is compressed... Demanding technology. David David Jonsson, Sweden, phone callto:+46703000370
