Vortices in my coffee and the Perpetual Ocean

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In a previous post I shared a video on mixing and unmixing of fluids. This time I share with you an image I took of my coffee. With some milk fluid dynamics created amazing vortices. Following it is an animation of the time evolution of the vortices.

Milk vortices.jpg
Milk vortices” by AstrobobOwn work. Licensed under CC BY-SA 4.0 via Commons.

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[Image] Archimedes’ screw

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[Image] Archimedes' screw

In the Netherlands, some of the windmills used to drain the polders at Kinderdijk have been replaced by modern Archimedes screws.

Image by: M.A. Wijngaarden
License: CC Attribution-Share Alike 2.5 Generic license.