friction factor rotating disc plate

[trentar]

Hay,
I have following problem.

One disc plate is rotating above the second stationary one (like rotor stator with a narrow gap between them). A fluid is flowing through center of rotating flow (similar like impinging jet flow fluid rotation disc).
Does anybody has some knowlidge about a fluid friction which flows between rotating and stationar disc plate? If yes what is the equation. Can we use Darcy weisbach equation or is there available some modification?

Any hint or answer is welcome!

Have a nice day!

R.

 

[cloa]

That might be a tribology question- how small is the gap between the plates?

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[trentar]

gap between plates is 2 to 3 mm and the plate diameter is 400mm

 

[Latexman]

Sounds like a big disk rheometer. You might find something searching for that. Sorry, I do not know of a friction correlation.

Good luck,
Latexman

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[btrueblood]

Von Karman solved the flow over a rotating disk in semi-infinite space; you can find his original paper as a NACA Techical Note via the NTRS server. Adding a shroud to the o.d. of the disk, or a closely spaced end wall as in your case, results in a pumped vortex...and the problem becomes non-trivial, involving heat transfer and work done by the disk on its surroundings (it is a simple pump, sometimes called an inverted Tesla turbine if a means to de-swirl the outlet flow is provided).

here's a starting point:

http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=390089