Thermal analysis problem

[BartEnder]

Hi everyone,

I have some problems modeling a thermal analysis in Abaqus/CAE.

I want to know the final temp in a plate (0.2x0.2x0.02 m) imported from CATIA V5.

The plate is heated by inner heating rods.

I entered my loads (surface heat flux) on the surface of the holes of the plate (about 2 w/m², all dimensions in meters) : theses are the only information I have.

I dont know how to simulate the ambiant air around my part. I tried interaction ==> surface film condition, but I dont know what to put in "sink temperature" (ambiant air is 20°C, material : steel).

Even if I manage to simulate the ambiant air, do you think I have enough information (a surface heat flux from the heating rod) to do a proper simulation?


Many thanks for your attention/futures answers

 

[corus]

Look at natural convection from the surface of a flat plate. You'll have different values for above and below the plate. In addition add radiation to the ambient (sink) temperature.

 

[BartEnder]

Thanks for your reply.

I combined radiation + convection as you said.

But my results still show me the ambiant temperature on the surfaces, which is not accurate (especially with 973°K within the plate, it should be more like 500°K I guess).

Do I have to modelize the ambiant air around my plate by a solid part (to have an overview of the temperature at the surface of my plate)?


TY

 

[corus]

Away from the heat source you may well have temperatures at ambient, depending on the size of the plate. You don't model the ambient air as it's not a solid (for one reason). Check the values of heat transfer coefficients, stefan bolzmann constant etc. and make sure you have the right units.