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transient heat transfer coorelation

transient heat transfer coorelation

transient heat transfer coorelation

(OP)
I have a fairly simple model that when I run a steady state version provides results that are similar to what we see in the real world. However if I try to simulate the heat up process with a transient model it fails to correlate by orders of magnitude. I expect some variation given the uncertainty of the boundary conditions but it should be remotely close and I am having trouble identifying the source of the error.

I am working in mm N s mm which gives me a a thermal conductivity in the range of 200 for aluminum (mW/mm*K). Does this seem correct? I am unsure on my convection coefficients (forced convection around 0,1 (mW/mm^2 * K) but I do not think that is issue here as even if I turn off convection the parts still heat much more slowly than expected. I do not have radiation active.

I have considerable experience with mechanical structural analysis but much less when it comes to thermal.

thanks

L

RE: transient heat transfer coorelation

(OP)
Thanks Dave, it is good to get some more sources to check my more obscure units but as far as I can tell what I am using is consistent. I will figure it out at some point.

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