vortex rings of air are repeatedly fired at the surface of mineral oil to
visualize the air ring impacts. Vortex rings are created when a large bolus
of air is quickly forced through an orifice. As the air is forced through the
orifice, it sticks to the surface opposite the orifice based on the Coanda Effect. This imbalance imparts a spin to the air.
The air ring eventually detaches but remains structurally very well in tact
as it cruises through the air since it has a great deal of inertia from its
rotational velocity. Fluids love to spin. Vortex ring generators of all sizes
are extremely easy to build. A small vortex ring generator can be made with a
coffee can, tape, a plastic bad, and a rubber-band. The rubber-band is used
to quickly force the plastic bag, acting as a diaphragm, to push the air
within the volume of the can through a hole cut into the bottom of it.
beer droplets in oil
magnetic control of a
deflection of an asteroid
shaping magnetic fields
Black-Hole in a Beer Can?
projectiles in magnetic fields
projectiles in fluids
and red lasers in gas and fluid
reflection, refraction, scattering
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