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couette flow plz help

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engchess:
hiiii everyone ... i wish u can help me in this .. i have a mass transport project and it is about couette flow .. in the cylinder i have two fluid water and oil .. my dr. ask me a aquetstion to look after it he says why the water rotates around the oil why not the oppisite he give me a hint he says it is to minimize the energy but he want the princibple that states that ? .. can u help me do u have any idea about what principle he is talking about !

Borek:
When water and oil separates - which one is at the bottom and why?

engchess:
when they are seperates i do not know , but he wants why when they are rotating in the cylinder the oil centerized the water

Borek:
Reason is the same, just forces different. Think it over.

Donaldson Tan:
Compare their density. Which is "lighter"?

Where does the "lighter" component go?

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