Comsol Multiphysics Heat Transfer

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Discussion Overview

The discussion revolves around the implementation of temperature-dependent thermal conductivity in COMSOL Multiphysics, focusing on how to input and derive the necessary equations from experimental data.

Discussion Character

  • Technical explanation, Experimental/applied, Homework-related

Main Points Raised

  • One participant inquires about how to input a temperature-dependent thermal conductivity coefficient into COMSOL.
  • Another participant suggests creating a global expression for thermal conductivity as a function of temperature, implying that COMSOL will handle the calculations.
  • A different participant expresses uncertainty about the equation for thermal conductivity and mentions having over 2000 data points for conductivity versus temperature, seeking guidance on deriving an equation from this data.
  • One suggestion involves using MATLAB to input the data points as a matrix, plot them, and apply curve fitting to find the equation.
  • A later reply indicates that the original poster successfully plotted the temperature profile in COMSOL, exported the data, and performed line fitting in Excel.

Areas of Agreement / Disagreement

Participants present various approaches to the problem, with no consensus on a single method for deriving the thermal conductivity equation from data points. The discussion includes differing opinions on tools and methods to use.

Contextual Notes

Limitations include the lack of specific equations for thermal conductivity and the dependence on the accuracy of the data points used for interpolation and curve fitting.

Who May Find This Useful

Individuals working with COMSOL Multiphysics, particularly those dealing with thermal conductivity in materials and seeking methods for data analysis and equation derivation.

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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