First, when the blades are arranged around the
outside edge. The photo is a shot of the container
ten seconds after spinning commences. The outer edge
where the blades are located is rotating, but the
middle area isn't moving at all.
The only way to transmit the rotation of the
outside edge to the middle is the viscosity of the
water, but strangely enough,
the viscosity of water is
quite weak.
Using the present blade setup, it would take as
much as an hour to get all the water to rotate only
by viscosity.
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