Vortex made for fruit drink. The vortex was continuous; the rate that the water ran out of the tank was the same as the rate at which the water was replenished, (see set photo below).
There is a cylindrical perspex insert in the tank to enhance the spiral. The standing vortex does not have to reach the floor of the tank but can end halfway according to the rate of water flow.
We discovered that we could make repeatable spiral shaped flames using a cylinder and a powerful flame
