Heat Transfer Of rotating machines (rotating rotor)

[theonlydave]

Hi all,

Following a recent thread that I posted recently, I finally found a suitable model for my problem, that is a rotating disk model. However, I am looking for existing textbook and/or literature of heat transfer of a rotating rotor at high speed. Can any one of you recommend some good books or online information?

 

[theonlydave]

I would also like to ask about the availability of the following articles of the earlier works in rotating disk:

E.C. Cobb and O.A Saunders,"Heat transfer from a rotating disc," Proc. Roy. Soc., Ser.A. Math. Phys. Sci. 236,343 (1956)

W.G. Cochran, "The flow due to a rotating disc," Proc. Cambridge Phil. Soc. 30,365 (1934).

D.R. Davis,"On the calculation of Eddy Viscosity and heat transfer in a turbulent boundary layer near a rapidly rotating disk," Q.J. Mech. Appl. Math. 12, Pt.2,211(1959)

F.Kreith and J.H.Tayler, Jr," Heat transfer from a rotating disk in turbulent flow," ASME Paper No 56-A-146 (1965)

Anyone has access or knows how to get hold of these articles may help me?

 

[TrevorH]

Theonlydave
I am starting out to find the heat transfer (via convection and radiation) of a rotating steel part say 0.8m dia x 0.5m long at 1000 rpm in air. Temps 100 degC with ambient of 20 degC.
I have studied various text books to bring my long forgotton degree knowledge up to speed. Have you any advice on a good source of information or even a similar textbook worked example?
Thanks Trevor

 

[JStephen]

How to get hold of this stuff is to visit the nearest college or university that has a substantial engineering department, and check out their library. If you're not enrolled, you probably can't check out stuff (and these would probably all be reference anyway), but you can still go in, peruse, and copy out what you need. I've done this at SMU and UTA before.

What I remember from heat transfer classes long ago is that on any kind of odd geometry like this, you're going to wind up using empirical information from somewhere. It's not just some simple problem that you could work out if you only remembered how.

Are you trying to find maximum heat loss, minimum cooling rate, or what?

You don't really give us much information, but a couple of approaches might give some helpful information. If you assume that the entire outside of the your rotor is at ambient temperature, and then calculate the heat transfer inside it, that ought to give you an upper bound on the actual heat transfer. If you can find any empirical data showing natural convection from a similar object that is NOT rotating, that ought to give you a lower bound on the actual heat transfer. (I can imagine there might be a huge spread between those numbers). If there is anything that limits airflow (or that can be made to limit airflow), you could assume that all the air flowing past or over the rotor was heated to the rotor surface temperature, and that would give you another upper bound on the heat transfer.