Hi every body!
I'm trying to build a model of the heatsink. When I run the simulation and calculation thermal resistance,value of the heatsink thermal resistance is different with parameter in the datasheet .
Please tell me how I can build a 3d model and set thermal parameters for it!
Thanks and best regards,
Linh Le
Hi Linh Le
you first need to have a 3D CAD model of all components.
Now you need to do a transient thermal analysis, to know how long it takes your model to reach the desired temperature.
in solidworks simulation for thermal analysis must go on connections right click and contact set and select thermal Resistance.
You should apply the boundary conditions for your model such as temperature, coefiente convection, conduction ....
Thanks
Best Regards.
Waldy J. Torres.
Hi Waldy !
thanks for your help.
I didn't present clearly. I'm using flow simulation functional .
I'm using heatsink UB25-15B, with parameters as shown below:
[IMG]http://i60.tinypic.com/a4wpar.png[/IMG]
After, I assign the material, temperature, power ..
The simulation results show that thermal resistance of this heat sink is 6.8 . However, according to the datasheet, thermal resistance is 3.25 .
Is there any way to set up parameters of the heatsink thermal resistane like the datasheet?
Thanks and best regards,
Linh Le
is it a heatsink only or heatsink with a fan?
Hi Jared !
It's a heatsink only.
not really anyway to do what you want
take a look at the heat sink smart part, it is similar, but it requires a fan. maybe you could make a fan that is "obstructed" so that it doesn't blow
the other option would be a porous medium, but that will get challenging when it comes to defining thermal properties
Hi Le,
The results shown in the graph are the heatsink performance with ducted air flow condition.
I would create the heatsink model as shown in the catalog, assemble into the rectangular duct channel (C/S same as heatsink size) and define the inlet air velocity at one end and environmental pressure on other end. You should be able reproduce similar results. I have done similar studies and the CFD prediction is quite satisfactory.
Like Jared mentioned, you can also define heatsink as porus medium, but is time consuming and have too many assumptions. Generally this method is useful when you have large heatsink and needs high mesh quality.
If you can post a picture of your CAD model, it would be helpful to guide you further.
Hi Linh Le
you first need to have a 3D CAD model of all components.
Now you need to do a transient thermal analysis, to know how long it takes your model to reach the desired temperature.
in solidworks simulation for thermal analysis must go on connections right click and contact set and select thermal Resistance.
You should apply the boundary conditions for your model such as temperature, coefiente convection, conduction ....
Thanks
Best Regards.
Waldy J. Torres.