I understand physchem!
But then I actually watched the video and I was like, oh crap, Reynold's numbers, that's not physchem, it's fluids; I don't know what anything is going on in fluids!
Actually, I think it's equivalent to a parallel plates flow problem. Since the outside wall is stationary and the inside is moving, the velocity gradient means the "mixed" colours are actually discrete sheets overlaid on top of each other. If you turn it enough, the process will still become irreversible.
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