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-   -   contact resistance in flotherm (http://www.cfd-online.com/Forums/floefd-floworks-flotherm/102564-contact-resistance-flotherm.html)

 Sivan_nk May 14, 2012 16:12

contact resistance in flotherm

Hi, does anybody nows how can I define a contact resistance between two parts in flotherm?
Sivan

 ABHIRAM May 31, 2012 05:57

Hi, Thermal conductivity defines the contact resistance. so,assign thermal conductivity of the component in material property window.thank you

 Gabriel_C June 1, 2012 07:01

Quote:
 Originally Posted by Sivan_nk (Post 361044) Hi, does anybody nows how can I define a contact resistance between two parts in flotherm? thanks in advance , Sivan
Hi,

I'm guessing that you're not speaking about the contact resistance from the electrical point of view (http://en.wikipedia.org/wiki/Contact_resistance). I assume you are speaking about the thermal contact resistance as the temperature drop between 2 surfaces in contact (see: http://en.wikipedia.org/wiki/Thermal...ct_conductance).

If my assumption is correct then you have to right click onto the cuboid you want to add a thermal contact resistance -> click on "Surface...". On the new opened window "Surface Attribute" enter the value for the "Rsurf-solid" [K*m^2/W].

E.g.: If you have 4µm air@25°C gap between an aluminum cuboid and the TIM you have to add a Rsurf-solid equal to (4*10e-6)[m]/(0.026)[W/m*K]=1.53e-4[K*m^2/W] on the surface of the aluminum that is in contact with the ThermalInterfaceMaterial.

Hope it helps, Gabi

 SOHYEON MUN January 14, 2014 00:06

good.
As you told, we design model like that.

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