# Vortex ring & Bubble ring upwards movement in water

Unlike a sea wave, whose motion is only apparent, a moving vortex ring actually carries the spinning fluid along. Just as a rotating wheel lessens the friction between the core and the surrounding stationary fluid, allowing it to travel a long distance with relatively little loss of mass and kinetic energy, and little change in size or shape. Thus, a vortex ring can carry mass much further and with less dispersion than a jet of fluid.

Not upwards, but with good examples for vortexrings

Bubblering moving upwards (with surface tension)

My questions are:

What will be the loss in Vorticity of a Vortex ring per meter, starting at 200m depth? Wikipedia Vorticity

(Pre-Edit-Question{deprecated}:What will be the loss in mass of a Vortex ring per meter, starting at 200m depth?)

I'm interested, if a colored vortex ring or a bubble ring(with colored fog (particles)) could be used for an autonomous robot, that operates underwater and communicates with another autonomous robot, which dives close to the water surface or flies (bigger cone for observation) above it.

This results in the following further questions: What is the stable max distance

1. a liquid vortex ring

2. a fluid bubble ring


can travel upwards in freshwater and saltwater,

1. without streams present

2. with streams present,

which occur typically in an ocean in depths from deepwater all the way up to the water surface?

• "[...]**lessens the friction between the core and the surrounding stationary fluid, allowing it to travel a long distance with relatively little loss of mass and kinetic energy, and little change in size or shape**. Thus, a vortex ring can carry mass much further and with less dispersion than a jet of fluid. "Wikipedia. What will be the loss in mass of a Vortexring per meter? – Sascha Friedrich Aug 15 '16 at 0:40
• Starting in 200m depth. – Sascha Friedrich Aug 15 '16 at 0:53
• Thx for help and guidance @count_to_10 . – Sascha Friedrich Aug 15 '16 at 1:10