4 Replies Latest reply on May 31, 2013 2:53 PM by Jared Conway

    Electronic component cooling

    Rajmond Jano

      Hey everybody!

       

      I have the following problem: I am trying to simulate the cooling of some electronic components and the way the materials they are made of influence the speed and efficiency of the cooling process.

       

      So far I have the following:

       

      1. The assembly in the attachment.

      2. Defined the capacitors as made of aluminum and the PCB as made of FR-4.

      3. Defined a fan for the circular lid and boundary conditions for the exit fins.

      4. Succesfully ran flow simulation.

       

      What I want to do now is some sort of animation: lets say that the components start out at 85'C and I want to see how the air circulating around the components cools them in time (and in what time). Then, change the material and/or placement of the components and rerun again.

       

      For this I'd like to see a cut plot of the components and see the way they are cooled from the outside to the inside.

       

      It there any way to do this?

       

      Because if I define the components as heat sources then they are kept at constant temperature (as defined) and you cannot see the cooling, but rather, them heating the air around it. I want the exact opposite: the air at constant temperature and the solid materials varying in temperature.

       

      I tried to define the initial temperature of solid materials to 85'C, however, when playing animations it seems to start where the results have converged (i.e. the solids already have been cooled).

       

      Thanks in advance for any help you can give me!

        • Re: Electronic component cooling
          Chris Michalski

          Rajmond -

           

          did you run a time-dependent study?  without that box checked Flow will only save the converged conditions.

           

          How did you define the heat sources? as constant temperature or wattage of heat generated?  To be accurate you need to define the watts  created and let Flow solve for the actual temperatures.

            • Re: Electronic component cooling
              Rajmond Jano

              Thanks Chris!

               

              Yes, I finally figured it out on my own and came across a tutorial video also which explained some steps in creating the animation.

               

              What I've done is create a time dependent study with physical time and defined the capacitors as having the initial temperature 100'C (Insert -> Initial Condition).

               

              Then I run the time dependent study with the cool air running around them, and monitor how much physical time it takes to cool them to a certain temperature (say 30'C). I have succesfully ran and measured the time yesterday for one material. Today I'm hoping to change the material and that the times it takes to cool the components will also change.

               

              Thank you again for the answer!