Comsol Multiphysics Heat Transfer

AI Thread Summary
To input a temperature-dependent thermal conductivity coefficient in COMSOL Multiphysics, create a global expression for thermal conductivity as a function of temperature. A user faced challenges finding the equation for thermal conductivity from over 2000 data points. They successfully generated a temperature profile by interpolating these data points. The solution involved using MATLAB for curve fitting and later exporting data to Excel for line fitting. The user ultimately resolved the issue through post-processing in COMSOL.
mherna48
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I have a problem where the coefficient of thermal conductivity changes as temperature changes. Where/how do I input this into comsol?
 
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just make a global expression for thermal conductivity as a function of temperature. it will work the rest out.
 
I don't know the equation for thermal conductivity as a function of temperature to do that. I was trying to find that equation, given over 2000 data points that plot conductivity versus Temperature.

I have since created a temperature profile(Thermal goggle view) by interpolating those data points. Now I'm trying to find the equation to the Temperature profile. Do you know how to go about doing this?
 
I would just suggest using MATLAB, input ur data points as a matrix and plot it, then use curve fitting.
 
Hey, Thanks again. I figured out how to do it. I went into post processing and plotted a line plot of the temperature along the z-axis. I then exported the data to a .txt file and opened it in Excel. Then I did the line fitting there.

Thanks again.
 

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