Cp variation for pure metal melting

vsmkrm298 · July 9, 2013, 05:23

Hi everyone,
I am modeling melting of a pure metal, so i enabled the solidification/melting option in fluent. But the problem with this is that you can specify only one value for Cp, i mean Cp is same for both solid and liquid. But in my case Cp values are different for both solid and liquid. So i thought of modeling the value of Cp by knowing the liquid fraction variation from the fluent (as i dont know the variation of Cp with temperature), but the problem is that fluent macro, DEFINE_SPECIFIC_HEAT has its arguments as T, Tref, *h. So, if i want to model using this macro, i need to have analytical formula for Cp in terms of temperature(which i dont), or atleast some analytical formula for liquid fraction in terms of temperature (which again i dont) so that i could write Cp in terms of liquid fraction. So is there any way to deal with this?

Thanks

yashganatra · July 13, 2013, 12:10

Write a UDF, see the FLUENT UDF guide for more details

July 9, 2013, 05:23	Cp variation for pure metal melting	#1
vsmkrm298 New Member vaseem akram shaik Join Date: Oct 2012 Posts: 12 Rep Power: 14	Hi everyone, I am modeling melting of a pure metal, so i enabled the solidification/melting option in fluent. But the problem with this is that you can specify only one value for Cp, i mean Cp is same for both solid and liquid. But in my case Cp values are different for both solid and liquid. So i thought of modeling the value of Cp by knowing the liquid fraction variation from the fluent (as i dont know the variation of Cp with temperature), but the problem is that fluent macro, DEFINE_SPECIFIC_HEAT has its arguments as T, Tref, *h. So, if i want to model using this macro, i need to have analytical formula for Cp in terms of temperature(which i dont), or atleast some analytical formula for liquid fraction in terms of temperature (which again i dont) so that i could write Cp in terms of liquid fraction. So is there any way to deal with this? Thanks

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July 13, 2013, 12:10		#2
yashganatra Member Yash Ganatra Join Date: Mar 2013 Posts: 67 Rep Power: 13	Write a UDF, see the FLUENT UDF guide for more details