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3 functions for specific heat capacity in solid material |
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November 2, 2016, 19:46 |
3 functions for specific heat capacity in solid material
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#1 |
New Member
Join Date: Oct 2016
Posts: 12
Rep Power: 10 |
Hi everyone,
I need to insert 3 functions for Specific Heat Capacity related to 3 different temperature ranges in a solid material. Here are the functions: 5.81E+2[J kg^-1 K^-1], for Temperature < 533.3[K] -2.96E+3[J kg^-1 K^-1]+1.50E+1[J kg^-1 K^-2]*Temperature-2.33E-2[J kg^-1 K^-3]*Temperature^2+,1.64E-5[J kg^-1 K^-4]*Temperature^3-4.40E-9[J kg^-1 K^-5]*Temperature^4, for 533.3[K] <=Temperature < 1088.9[K] 4.14E+2[J kg^-1 K^-1]+8.63E-1[J kg^-1 K^-2]*Temperature-6.14E-4[J kg^-1 K^-3]*Temperature^2+2.09E-7[J kg^-1 K^-4]*Temperature^3-2.70E-11[J kg^-1 K^-5]*Temperature^4, for 1088.9[K] <= Temperature < 2200[K] Is it possible? If so, how? Thanks! |
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November 3, 2016, 03:03 |
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#2 |
Senior Member
Lance
Join Date: Mar 2009
Posts: 669
Rep Power: 22 |
Have you tried nested if statements?
if(T< 533[K],first expression,if(T<1088[K], second expression, if(T<2200[k], third expression,#))) where # is the value for Cp above 2200 [K] |
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November 3, 2016, 03:04 |
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#3 |
Senior Member
urosgrivc
Join Date: Dec 2015
Location: Slovenija
Posts: 365
Rep Power: 11 |
Yes, this can be simply done by expressions.
I would first make an (if) sentence that would chose in what sector the temperature is either(S1,S2,S3) like this: sector selector=...if(T<533[K],S1,if(T<1088[K],S2,S3)) [J kg^-1 K^-1] than write three expresions for sectors: S1=....your equation dependant on (T) S2=....-ll- S3=....-ll- Than you set the, here called sector selector expression as a material property for heat capacity. hehe it seems that lance and I were both tiping the same thing at the same time |
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November 3, 2016, 21:45 |
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#4 |
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Join Date: Oct 2016
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Lance and urosgrivc, thank you very much!
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November 9, 2016, 17:53 |
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#5 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,183
Rep Power: 23 |
First of all, you will most likely need to include more significant digits when using higher polynomial expressions like that.
Second, another way to do this would be just using a user interpolation function, like a table of temperatures and values for specific heat. |
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November 14, 2016, 06:23 |
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#6 |
New Member
Join Date: Oct 2016
Posts: 12
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Thank you, evcelica
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