If you put a gas in a tube, and spin the tube [edit: along the axis of the cylinder], you will get a centrifuge.
What's the maximum pressure differential between edge and centre?
Asked another way: how close can we get to perfect vacuum, in a human-scale cylinder, with gas in the cylinder initially at atmospheric pressure or higher, and without liquidizing the gas or moving the cylinder walls at relativistic speeds? What're the variables we need to know?
Would Bernoulli’s Equation for a Rotating Fluid be the right way to tackle a compressible gas?
Cylinder diameter, and gas molecules per inch of the cylinder seem two obvious variables. With infinite diameter and a zero gas, we end up with a fairly good vacuum, which is why I ask about the biggest pressure differential, even though getting close to perfect vacuum in the centre of the cylinder is the goal.
You can increase the friction against the walls with fins or whatever, and start with the gas injected at an angle at high speed, or whatever explicitly-declared other handwaves necessary to maximize the differential in your answer.