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contact resistance in flotherm

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Old   May 14, 2012, 16:12
Default contact resistance in flotherm
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Sivan Natan-Knaz
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Hi, does anybody nows how can I define a contact resistance between two parts in flotherm?
thanks in advance ,
Sivan
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Old   May 31, 2012, 05:57
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ABHI
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Hi, Thermal conductivity defines the contact resistance. so,assign thermal conductivity of the component in material property window.thank you
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Old   June 1, 2012, 07:01
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Gabriel Ciobanu
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Quote:
Originally Posted by Sivan_nk View Post
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 4m air@25C 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
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Old   January 14, 2014, 00:06
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SOHYEON MUN
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good.
As you told, we design model like that.
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