As the heat rises and the volume constricts, it speeds up the vertical flow, it then smoothly flares out and lowers the pressure at the center of the exit, notice how the steam concentrates at the center of the tower. That is the area with most flow because that is the area of the outlet with lowest pressure. Since it's the lowest pressure it also creates the greatest amount of condensation. The water collects in a shallow pool under those pipes, there are guide vanes under those water sprinklers that guide the water and act like heat exchangers.
Neat! Thx for the explanation. Reminds me of a wind turbine tower design I saw years ago that is supposed to work similar to this. They would have to build it in the deser or something in order to get enough uplifting air to push turbines.
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