pretty sure it's both
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Replying to @mattbramanti @NoLongerBennett
the shape induces chimney effect airflow, IIRC
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Replying to @NoLongerBennett @mattbramanti
I know from reading on rocket engine tech that a constriction has the effect of increasing the the flow SPEED in the constricted part ; this is why rocket engines neck down after the combustion chamber, to trade pressure for velocity, bc KE = 1/2 mv^2, so you want to boost v >>>
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and I think that cooling towers have the constriction for a similar reason ... to take a very slow upward migration of hot air and turn it into a more rapid upward migration ... but I'm not sure why. I also think that this upward flow is intended to draw a vacuum at the bottom >
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...much like the bolus of exhaust gases in the exhaust pipe of a 2-stroke engine is tuned to draw a vacuum on the cylinder, in order to scavenge more exhaust gasses out of it (cooling towers have intake vents around the bottom circumference, to admit more atmospheric air)
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