contact resistance in flotherm

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 May 14, 2012, 16:12 contact resistance in flotherm #1 New Member   Sivan Natan-Knaz Join Date: Jul 2011 Posts: 7 Rep Power: 8 Hi, does anybody nows how can I define a contact resistance between two parts in flotherm? thanks in advance , Sivan

 May 31, 2012, 05:57 #2 New Member   ABHI Join Date: May 2012 Location: HYDERABAD Posts: 5 Rep Power: 7 Hi, Thermal conductivity defines the contact resistance. so,assign thermal conductivity of the component in material property window.thank you

June 1, 2012, 07:01
#3
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Gabriel Ciobanu
Join Date: Jul 2011
Posts: 44
Rep Power: 8
Quote:
 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

 January 14, 2014, 00:06 #4 New Member   SOHYEON MUN Join Date: Jan 2014 Location: Media LAB. Posts: 9 Rep Power: 5 good. As you told, we design model like that.

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