Can heavy water be isolated with water centrifuges? If a container of pure water is rotated fast enough at high rpm, would $\mathrm{D_2 O}$ separation be feasible?
Another way to ask is: it practically and physically possible with current technology to spin the water container at sufficient rpm (revolutions per minute) to accomplish heavy water separation?  
 A: I am prety sure it would work, but separation factor is pretty low(1.1111…) because D2O is only 10% heavier. Its just inneficient.
A: Using a standard (not continuous) centrifuge, I would expect results ot be fairly dissapointing, as on "power down", I would anticipate a lot of the gains to be undone by diffusion.
BUT
If it were possible to use a continous centrifuge - and then cascade them in such a way that each stage was only expected to provide a modest enrichment, I would see that it would almost HAVE to work.
With a stop/start style centrifuge, if you were able to modify it, such that longer tubes were possible and you worked on the basis of just "discarding about 90%" each time, I see not reson why you could not end up with "Fairly heavy water".
Of course once you have "heavyish" water, you can start to play around with different freezing temperatures of H2O - v - D20 at both normal and reduced / increased pressures. Also electrolysis and then Girdler/Sulphide - even if just a single stage column?
As is often the case, the answer to your questions is "sort of". Certainly you could increase the percentage of D20 - but as a method og producing high purity D2O, I think it would be flawed.
