heat transfer coefficient for rotating metal cylinder in oil 2

[richiman]

Hi!

I'm new to this forum and I'm glad I found it!

So here is my question:
How do I calculate the heat transfer coefficient for
a rotating (metal) cylinder in oil. The temperatures are
not to extreme (0...100°C), the velocities neither(0..100m/s)

How do I know if my fluid is in a laminar or turbulent state?

If you know of a good book about heat tranfer coeffs. with a lot of examples etc. I'd appreciate the hint!

Thanx in advance!

Richard

 

[pmover]

there have been many postings in this forum providing a link to a heat transfer textbook written by a professor at MIT.

got lucky and found the posting.

There is an outstanding textbook available from MIT Professor in pdf format for free at the following link:

http://web.mit.edu/lienhard/www/

good luck!
-pmover

 

[tlee123]

Richiman,

You asked: How do I know if my fluid is in a laminar or turbulent state?

First the flow between the OD of the metal cylinder and the (inferred) ID of the outer cylinder is called Couette flow and information can be found in a fluid dynamics book. For this specific case, you'll need to calculate the Taylor number to determine whether the flow is laminar, turbulent, or laminar with toroidal vortices. My guess is that the heat transfer will depend significantly on the nature of this flow.

Tom

 

[richiman]

Thank you for the info! I will start reading the book ;-))
If you find any info about my problem i'm still thankfull.

The rotating cylinder is far away from other borders...

Richard