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Convection coefficient and thermal expansion

Posted 9 août 2011, 20:32 UTC−4 Heat Transfer & Phase Change, Structural Mechanics Version 4.2 1 Reply

Alexis Grenier
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Hi everyone,

I have created a 2D axisymmetric model with a substrate and a thin coating at its top.The system cool-down from 560K to 300K with a convective cooling BC.To simulate the residual stresses I use the thermal expansion feature

It's working well but now, I am trying to analyze the effects of convection coefficient on the residual stresses. I have found some papers about ANSYS simulations where a higher convection coefficient to environment creates higher residual stresses.

I have tried with h=8,50 and 200 W/m².K and the residual stresses are the same.

Do you know if it is a feature that COMSOL doesn't take in account?

Thanks a lot for any help!

Alexis
1 Reply Last Post 11 août 2011, 10:53 UTC−4
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 11 août 2011, 10:53 UTC−4
Changing the convection coefficient changes the temperature distribution in the solid which should change the residual stresses. You should be seeing that in your COMSOL model. The higher convection coefficient leads to higher temperature gradients in the solid (higher Biot number) and that typically causes higher stresses near the surface.

Nagi Elabbasi
Veryst Engineering
Changing the convection coefficient changes the temperature distribution in the solid which should change the residual stresses. You should be seeing that in your COMSOL model. The higher convection coefficient leads to higher temperature gradients in the solid (higher Biot number) and that typically causes higher stresses near the surface. Nagi Elabbasi Veryst Engineering

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