Access Material library in UDF

icemesh · March 4, 2013, 05:03

Hi,
I am writing a UDF in order to implement a vaporization/flash-boiling law for DPM-Calculations.

Now I have the following problem:
I have a droplet surface at boiling Temperature T_b, and the gas phase is at temperature T_g. In the calculations for the evaporaton mass flow from droplet to gasflow I need specific heat, thermal conductivity and viscosity of the gasphase, but at reference temperature calculated as

T_ref=2/3*T_b+1/3*T_g.

In the UDF-manual it is described I can access the specific heat with C_CP(c,t) but this would give me the specific heat of the cell, meaning at T_g.

How can I access the material property library, depending on material and temperature, is this possible?

Thanks for your help!

vasava · March 13, 2013, 05:46

Please check if this helps

http://combust.hit.edu.cn:8080/fluen...df/node109.htm

I am not sure if it answers your question.

icemesh · April 18, 2013, 07:53

Thanks, I have now defined my properties as UDFs and therefore can access them inmy UDF of interest.

March 4, 2013, 05:03	Access Material library in UDF	#1
icemesh New Member Join Date: Oct 2012 Posts: 8 Rep Power: 13	Hi, I am writing a UDF in order to implement a vaporization/flash-boiling law for DPM-Calculations. Now I have the following problem: I have a droplet surface at boiling Temperature T_b, and the gas phase is at temperature T_g. In the calculations for the evaporaton mass flow from droplet to gasflow I need specific heat, thermal conductivity and viscosity of the gasphase, but at reference temperature calculated as T_ref=2/3T_b+1/3T_g. In the UDF-manual it is described I can access the specific heat with C_CP(c,t) but this would give me the specific heat of the cell, meaning at T_g. How can I access the material property library, depending on material and temperature, is this possible? Thanks for your help!

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March 13, 2013, 05:46		#2
vasava Senior Member Paritosh Vasava Join Date: Oct 2012 Location: Lappeenranta, Finland Posts: 732 Rep Power: 22	Please check if this helps http://combust.hit.edu.cn:8080/fluen...df/node109.htm I am not sure if it answers your question.

April 18, 2013, 07:53		#3
icemesh New Member Join Date: Oct 2012 Posts: 8 Rep Power: 13	Thanks, I have now defined my properties as UDFs and therefore can access them inmy UDF of interest.