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Originally posted by Nventual
The hexagon has been recreated in a lab in a water enviroment but not gas as far as I can remember.
I forget what causes it though but I do remember them coming to a conclusion.
The Oxford researchers made a model of Saturn's North Pole. A slowly-spinning cylinder of water represented Saturn's atmosphere, and a small, rapidly-spinning ring represented a jet stream. They added some fluorescent green dye, and got a pretty well-defined hexagon.
We report a novel and spectacular instability of a fluid surface in a rotating system.
In a flow driven by rotating the bottom plate of a partially filled, stationary cylindrical
container, the shape of the free surface can spontaneously break the axial symmetry
and assume the form of a polygon rotating rigidly with a speed different from that of the
plate. With water we have observed polygons with up to 6 corners. It has been known
for many years that such flows are prone to symmetry breaking, but apparently the
polygonal surface shapes have never been observed. The creation of rotating internal
waves in a similar setup was observed for much lower rotation rates, where the free
surface remains essentially flat [1]-[3]. We speculate that the instability is caused by the
strong azimuthal shear due to the stationary walls and that it is triggered by minute
wobbling of the rotating plate. The slight asymmetry induces a tendency for modelocking
between the plate and the polygon, where the polygon rotates by one corner
for each complete rotation of the plate.
Originally posted by Pauligirl
Originally posted by Nventual
The hexagon has been recreated in a lab in a water enviroment but not gas as far as I can remember.
I forget what causes it though but I do remember them coming to a conclusion.
probably this:
news.discovery.com...
The Oxford researchers made a model of Saturn's North Pole. A slowly-spinning cylinder of water represented Saturn's atmosphere, and a small, rapidly-spinning ring represented a jet stream. They added some fluorescent green dye, and got a pretty well-defined hexagon.