Hey, is there a cooling solution that sprays water on some sort of heat spreader and lets it evaporate? Kidding. Kinda. But actually, is that possible?
Heat pipes sort of do that naturally without any active "spraying". They contain a fluid that phase changes and carries heat away. Closed loop water coolers have the active flow of water you want for maximum effect. I don't think your idea would be an improvement on that.
That's essentially what vapor chamber coolers are. It's a sealed unit where the working fluid evaporates on the CPU end, absorbing a ton of heat, and then condenses on the other side, before going back to do the cycle again. Because the heat of vaporization is so large, these can move a lot more heat than ordinary heat sinks.
