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input method for various temperature value

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Old   January 15, 2010, 18:24
Default input method for various temperature value
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jaikrishna
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I've thermal conductivity of steel from 400 to 700 degree C at the interval of 25 degree C.
how can i feed it this valves into CFX?
from 400 to 700 k-valve is not linear...
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Old   January 15, 2010, 21:52
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Create a CEL expression for thermal conductivity as a function of temperature based on your fit to the data (e.g. VarThermConduct=a+bT+cT^2+... where you make sure each of the terms has the correct units) and replace the value for the Thermal Conductivity under the Material Properties tab with your expression (VarThermConduct).

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Old   January 16, 2010, 00:07
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Or use a 1D interpolation function. This uses linear interpolation between the points.
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Old   January 16, 2010, 14:20
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please explain the formula elaborately.
thanks.
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Old   January 16, 2010, 16:58
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you should make an user function, with two points 400 and 700 K, with step number (700-400)/25. After that you should define an expression, which uses this function. And when you set the temperature, you should set this expression by its name. These steps are well described in cfx help. Good luck!
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