Para, do you have for me the natuaral time constant (0.632 of the step) for your rod when rising the temperature ?
You mentioned about 180 seconds, but I have no clue to what the reference value that was.
Reason is that that 180 seconds was much more then what I simulated (See post #10).
This was a reason for me to look again at the old simulation FEM data and must admit that for the density of Alumina I mistyped and used a value of 390 kg/m^3 instead of 3900 kg/m^3.
So I intend to redo this, but also with a better power distribution and the temperature dependency of material properties entered as piecewise linear curves instead of fixed values.
However a simulation run takes a lot of preparation time and every simulation run itself takes 4 to 6 hours on my computer.
As such it will take quite some time before I have gathered enough data to analyse.
If the results are interesting enough I will in the future publish them in this thread.