Thermal conductivity unit of measurement

[Zaninho23]

Good morning, I am doing some tests related to thermal analysis of sections, both in steel (following your tutorial on youtube) and trying to make a new brick material. I wanted to ask you in what units the thermal conductivity should be expressed. Among the materials in the database I see for example for steel a value of 0.055 when for steel the conductivity is worth about 55 W/mK. Is this difference perhaps to be attributed to kN and kg in the definition of Watt ? Pot can you also tell me the unit of measurement for specific heat ? Thank you very much

[NextFEM Admin]

Hello,
if not specified in the window, units of material properties are consistent with the model. For instance, check the material library in NextFEM installation folder C:\Program Files\NextFEM\NextFEM Designer 64bit\data\Steel-MC EN.nfm (open as plain text). You’ll find:
K [N/s/°C] – conductivity
Cp [N*m/(kg*°C)] – Specific heat
a_T [1/°C] – thermal distorsion linear coeff.
Conductivity for steel is assumed as 54 W/mK (1W=1Nm/s, hence 1N/(s*°C) = 1 W/mK), then this value is converted into model units.

Hope this helps, regards

[Author]

Posts