# input method for various temperature value

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 January 15, 2010, 18:24 input method for various temperature value #1 Member   jaikrishna Join Date: Mar 2009 Location: chennai Posts: 56 Rep Power: 10 Sponsored Links 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...

 January 15, 2010, 21:52 #2 Member   Tristan Burton Join Date: Mar 2009 Posts: 43 Rep Power: 10 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). Tristan

 January 16, 2010, 00:07 #3 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,735 Rep Power: 106 Or use a 1D interpolation function. This uses linear interpolation between the points.

 January 16, 2010, 14:20 #4 Member   jaikrishna Join Date: Mar 2009 Location: chennai Posts: 56 Rep Power: 10 please explain the formula elaborately. thanks.

 January 16, 2010, 16:58 #5 Senior Member     Attesz Join Date: Mar 2009 Location: Munich Posts: 364 Rep Power: 10 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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