Help with thermal study regarding a heatsink in solidworks

Hi.
I try to do a thermal study and see how my heatsink would dissipate heat.
Although, if I tell Solidworks to apply 70 degress on the heatsink the top one stays 70c all the time. Or should I model up a processor that puts out like 70c and mate it to the heatsink surface rather than just applying it directly to the surface?

Also, can I somehow put in the thermal resistance since I mate copper pipes to aluminum?

http://imgur.com/f6E8nhN

Hope you can see the picture.

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