system is a follows:
Electrical components producing X Watts are bonded to a thermal pad which is bonded to a heat sink which is bonded to a chassis and part of the chassis has a known temp.
I ran 2 simulations. One used a thermal pad with a conductance of 6 W/m-K and one with 3 W/m-K.
I am getting consistantly lower component temperatures with the less conductive thermal pad! (45deg vs 44deg).
Anyone know why this might be?
Thank you
the only place in your model that the temperature can leave is through a face that you've set the temperature? or do you have convection applied to the model somewhere? remember that if you don't apply a bc to a non-conduction face, it is assumed insulated.
have you created a simple stackup example of blocks to check that its not your model and/or the software (depending on what the outcome is)