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Originally Posted by yoda
What I need to know is if the water needs to spend a lot of time in the air so it can evaporate???
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It's not the time the water spends in the air that's important, but the amount of surface area. Picture a 'freeze-frame' of a couple of different heights/diameters. How much droplet surface area is available for evaporation/heat-transfer? If you keep the water flow the same and decrease the size of the droplets, what happens to the surface area?
The other thing that really matters is air flow. A given volume of air can only pick so much extra heat/moisture. Increase the air flow, increase the cooling capacity.
The general idea of multiple towers is a good one. I'd start with one or two, then add more 'til you get to the point of diminishing returns.