contact coefficient for thermal analysis

[simpledude]

I have a thermal study (SW Sim/Cosmos) in which to begin with I have assumed bonded contact faces for the transfer of heat, essentially 100% transfer (as I understand it). I am now trying to get a more accurate study with inputing a closer to real life heat transfer between faces. Does anyone have a good reference for contact face coefficients? I am using carbon steel, stainless steel, ceramics and possibly teflon and nitrile (seals, not as important).

I also posted this question in the FEA forum, I hope posting it twice is an issue.

Thanks a bunch.

 

[CastMetal]

Thermal contact conductance/ resistance varies greatly with pressure and surface area. Measuring surface area at the microscopic level is not an easy thing so most all of these values are found experimentally.
The only central resource I know of is

http://cocoe.sourceforge.net/

and its far from perfect but it'll give you ballpark figures.

 

[buffbull11]

Suggest you obtain a copy of ASME Document PVP20100-25131 (Proceedings of the ASME 2010 Pressure Vessels & Piping Division / K-PVP Conference, Bellevue Washington, July 18-22) entitled "Evaluation of Thermal Contact Resistance at the Interface Composed of Dissimilar Materials".

 

[IRstuff]

There's a lot of research literature on the subject:

http://academic.research.microsoft.com/Search.aspx?query=thermal contact resistance

TTFN

FAQ731-376
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[simpledude]

Thanks for the input, I am looking at all three.

all the Best,