Very good description of the action seen in the gas as far as I'm concerned.
As for the coanda effect, I think that DTC was looking for an example and this was the closest he found.
Yes, it doesn't show the effect.
It does show a similar effect to what would happen inside the tower. Heavier gas flowing through a duct in the base.
"It is difficult to get a man to understand something, when his salary depends upon his not understanding it."
Upton Sinclair