Learning Forum

[Juwelmojumder1]

Hi,

I want to measure the thermal conductivity of the doped material, numerically. I have the individual properties on my hand, but not the composite material. Furthermore, I have temperature BC and heat flux, and other material properties except the thermal conductivity. What Ansys module is compatible to do this job? In fact, In ANSYS-Fluent, module asks for the conductivity value under the set-up of material properties, and not allow me to move forward.

Thanks

[Amine Ben Hadj Ali]

I do not think this is possible in Ansys Fluent. It is a required material property and and user's input.

[Rob]

If you set up the model to contain each and every fibre, sheet of material etc then you can push heat across the domain and then infer the bulk conductivity. Much as you'd do it experimentally. However, to do that is going to need a very complex model. Hence why we work with the bulk properties.

[Juwelmojumder1]

Thanks for your feedback.
I'm using ACP post to model the geometry that contains the fibre and matrix. Here, the material inputs for fibre is just the form of sheets. The fibres amount can be applied using the required volume fractions over the whole composite material sample. Volume fractions are formulated by the thickness of the fibre. Later, ACP outputs are exported to the steady state thermal to calculate the temperature-difference between the surfaces that gives the thermal conductivity of the composite with respect to known heat flux and area. I'm not sure the procedure is properly reflecting the method of calculating conductivity of composite. If I increase the layers number by reducing the fibre thickness, fibre alignment is still remaining the same. How to properly model the two different materials in a composite manner, then?
Regards
Juwel

[Rob]

In Fluent we just assign a material property, we then either use solid zones or "thin" walls so don't need to worry about fibres. If you're trying to figure out what is going on in ACP or Mechanical I can move the thread into a more appropriate section.