There are several potential problems with a circular room. To make a circular airflow would require racks to be staged in wagon wheel spoke like rows. That would then push hot air into the cold isle of the next row. Also where would you place the CRACs or whatever you use. You could place the CRACs wherever and create ducting in the top space of the room to continue to cyclone effect.
Even after making the airflow as cyclonic as possible the fact that the hot air is being pushed into the cold isle of the next rack would negate and most likely reduce the cooling effect that might be gained.
Hot/cold isle containment is still the best way to go. One caveat to that is using water cooled rack doors. That would introduce another variable to the equation that could push the cooling factor for a round room higher than a square room. I think some CFD sims would really help out.
One other downside for a round room is wasted space. Square peg/round hole and all that.
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