1 Reply Latest reply on Jun 26, 2014 11:51 PM by Jared Conway

    Modelling Thermal Loss in an Assembly

    Manpreet Purewal

      I'm having trouble with simulating the time taken for a section of an assembly to return to ambient temperature, after being brought up to 65 degrees C within 1 second, with the heat source immediately switched off thereafter. The assembly itself is a thin glass rod surrounded by a cuboid of a copper alloy.

       

      The input conditions that I am using for the transient thermal simulation are convection effects upon the outer surfaces of the assembly, the initial temperature at 300K and the input temperature acting upon only the glass cylindrical rod of 65 degrees C.

       

      Heat is meant to spread outwards from the heated point, causing the central glass rod to eventually cool to ambient temperatures. However, I am finding that the simulation accurately displays the time taken for the glass rod to heat up, but the temperature does not decrease after this point.

       

      Is it likely that I am missing a setting in a transient simulation to allow me to observe the effects of heat loss, and the time taken for a point on the assembly to drop from the heated temperature of 65 degrees C to 300K?

       

      Thanks,

      Manpreet

        • Re: Modelling Thermal Loss in an Assembly
          Jared Conway

          if you aplied 65deg C, it will stay at 65 deg C the whole time

           

          you need:

          1. apply initial temp to the whole body of 65deg

          2. create convection

           

          run transient

           

          this assumes that you don't care about the heating up part and just the cooling off part

          as long as your transient runs long enough, you'll get to steady state (which should be something close to your convection ambient)

           

          what confuses me about your description is where the 300 k come sfrom