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Temperature dependent values in dependence of K?

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Old   February 2, 2017, 14:46
Default Temperature dependent values in dependence of K?
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Hello everyone,

in Fluent, I would like to apply temperature dependent values.

I have a polynominal curve that describes the heat conductance of copper in dependence of temperature. It is attached to this post whereas one curve is in dependence of celsius and one in Kelvin.

I use Celsius as the unit for temperature. In the manual it is stated:

"If you define a polynomial or piecewise-polynomial function of temperature, the temperature
in the function is always in units of Kelvin or Rankine. If you use Celsius or Kelvin as the
temperature unit, then polynomial coefficient values must be entered in terms of Kelvin."

This would mean that I shall use the blue curve (Kelvin curve). Then, the constant coefficient is 408,8 whereas the constant coefficient of the celsius curve is 386,5.

The previous (by Ansys) implemented value was 386,1 which is very close to the value of the red curve. Therefore I'm a bit confused which curve is the right curve to implement.

Best regards
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