Please help me!
What is exactly the "Couetti Flow"? And where could I find a scientific explanation of this phenomenon?
Thanks

I guess your web search is not working.
http://en.wikipedia.org/wiki/Taylor-Couette_flow

Walt

Thank you, Walt!
Unfortunately I was looking for "Couetti"

Solution of Reynold's equaition for oil flow in the area between two surfaces under some simplifying assumptions (assumptions that result in velocity distribution as a function of a single spatial variable in the direction perpendicular to the surfaces) gives two terms: Coutte flow and Poiseille (sp?) flow.

The Couette flow is due to the relative movement of the surfaces and it's velocity varies linearly with distance perpendicular to the surface (varies linearly from the speed of one surface to the speed of the other surface).

The Poseille flow is due to a pressure differential in direction parallel to the surfaces and has a parabolic distribution in direction perpendicular to the surfaces (tends to be retarded by both surfaces).

Couette flow is also called shear flow and Poseille flow is also called pressure flow. These are more descriptive / useful terms imo.

I have never heard of "Couetti" and I suspect it was a mis-spelling of Couette. I suspect Couette and Poiseille are French names or words, but I'm not sure.

This message has been edited. Last edited by: electricpete,

Yes, "Couetti" is certainly a mis-spelling of Couette. I found it (Couetti flow) in an article about electric motors lubrication by H.W. Penrose.
Actually Couette is a French name: Maurice Marie Alfred Couette, 1858-1943, was a French physicist who studied fluid mechanics (from Wikipedia), like the more famous Jean-Léonard-Marie Poiseuille.

...Or it could be a French spelling for cootie . We had a kid in elementary school with cooties.

ElPete may have something. Even an elementary (no cooties, please) text on fluid dynamics (dynamics and statics) should have more about this. I suggest buying a book or going to the library to learn more.