[Sivan_nk]

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

[ABHIRAM]

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

[Gabriel_C]

Originally Posted by Sivan_nk

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]

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