[hebeldebel]

Hi,

I ran a simulation of a cube with volumetric heat source and different heat conduction properties within each of its parts. I then wrote the boundary heat transfer and temperature values of the outer boundaries into a table (xyz). Using the maximum temperature within the cube I calculated a mean thermal resistance and added the result as a new table (xyz) to the outer shell as contact resistance. I hoped to see the same heat distribution as before, while I was using a cube made out of a single part.

This did not really work out, there are some similarities but the temperature is way too low. Did I miss something? Can it work and I simply did something wrong, or can't this work at all?

Thanks for your advices

[me3840]

I'm confused with your description. If there's just a single cube, where is the heat conducting to?

[hebeldebel]

I made some pictures to describe the setup.

The picture "whole_setup.jpg" shows the solid block in the middle of a fluid tube with a pressure outlet on both fronts of the tube. The block itself is made out of 5 pieces with the centerpiece defined as a volumetric heat source with 10000 W/m^3 and shown in picture block.jpg .

I then ran a simulation and extracted the resulting boundary heat transfer and temperature on the "fluid-solid" interfaces into a csv file (shown in picture table.jpg).

After that, I determined the maximum temperature within the centerpiece.

Given equation1, I set Q to be the extracted boundary heat transfer at xyz, T1 to be the maximum temperature within the centerpiece and T2 to be the extracted temperature at xyz.

I then rearranged the formula to look like equation2.jpg and removed the area A from it, as ccm+ is looking for a resistance value in the format shown in format.jpg .

The results (for every xyz position) were then added to a new csv file (format: "thermal resistance,x,y,z") and read into a new simulation, which consisted of the same fluid part and a solid part made out of a single piece in the same position as the previous one. It is defined as a volumetric heat source with the same power, but due to higher volume, lower power density (2500 W/m^3).

The thermal resistance was added as contact resistance at the solid-fluid interface. I hoped to see the same temperature distribution, I saw using different pieces with distinct thermal conductivities. But the results seem inverted.

My question is: Can this actually work? What my I have done wrong?

[hebeldebel]

This post is just for the second set of pictures