Hi, I'm looking for a clear descripion of what a curl is. From what I understand, the curl of a point in flowing water can conceptually be measured by placing the center of a paddle-wheel at the point. The vector direction is then given by the rotation axis when it spins the fastest and orientation by the right-hand rule. Is the value given by the angular speed of the wheel or twice the angular speed or neither, and why?(adsbygoogle = window.adsbygoogle || []).push({});

In the three following systems, which seem to me to be 3 possibilities of a similar case, which has the greatest curl? :

-Water flow in a bowl when I make circles with my finger at the edge of the bowl. (angular speed greater with greater radius)

-A rotating LP (angular speed constant with radius)

-Water flow in a bowl when I make circles with a rod at the center (angular speed smaller with geater radius).

Thanks.

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# Descripion of what a curl is

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