Water spirals are absolutely magnificent This gif from one of…

Water spirals are absolutely magnificent

This gif from one of the Slow mo guys videos is extremely fascinating. Water spirals have been of considerable research interest in Fluid Dynamics and as it turns out the gif is only a mode of ejection for the water.

Here are the other modes:

image

These are dependent on the angular velocity of the sphere The sphere is rotating
clockwise with an angular velocity of (a) 84, (b) 137, © 357, and (d)
406 rad/s.

And as one keeps increasing the angular velocity, the stability of the sheet is destroyed and the fluid ejects as small droplets from the equatorial region.

Source: Langley, Kenneth &
Maynes, Daniel & Truscott, Tadd. (2015). Eggs and milk: Spinning
spheres partially immersed in a liquid bath. Physics of Fluids. 27.
032102. 10.1063/1.4913574.