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Unexpected unit of input
Posted 19 feb 2020, 11:06 GMT-5 Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD), Parameters, Variables, & Functions 1 Reply
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Hi everyone,
I want to create a function for Cp of a material and for a simple function, COMSOL gives me "unexpected unit of input"!
260-300 (K) 9.797*T-1029
300-340 (K) 3247-8.861*T+1.821*10^(-2)*T^2
the unit for the argument is in K and for Cp J/(kg*K).
Did anyone know how can I solve this problem?
Thank you in advance,
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Presumably you got the expression for Cp from a reference somewhere. Is the Cp in that reference J/(kgK)? Are you sure T is in K? You need to be very careful using empirical expressions.
IF the units are the same, then write
3247*J/(kgK)
-8.861T*J/(kgK*K)
etc.