SuperCritical Fluid modeling

faS · November 7, 2020, 07:27

Hello every body!
I am going to model a supercritical fluid inside a pipe.As the thermodynamic properties such as density varies with temp and pressure ,I wrote UDF for properties.
my question is:
1.During writing udf for specific heat, as the specific heat is dependent to temp and pressure for calculating (((*h))) integral from T_ref to T is required or it is calculated through c_p*(T-T_ref)?
2. writing udf for turbulent viscosity,how can I call written udf for density to calculate turbulent viscosity(in DEFINE TURBULENT VISCOSITY)?

thanks for helping me

rewol · November 8, 2020, 14:43

1. Could you please explain your question a bit more clearer? Basically you have to calculate departure functions and add it to reference cp value.

2. Im assuming this is for FLUENT. You do not have to do anything for "turbulent viscosity". You have to write an UDF for laminar viscosity which will be utilized in viscosity calculation along with turbulent viscosity. Also thermal conductivity should be modeled.

I can help further if you need.

Refik

November 7, 2020, 07:27	SuperCritical Fluid modeling	#1
faS New Member faezeh Join Date: Nov 2020 Posts: 1 Rep Power: 0	Hello every body! I am going to model a supercritical fluid inside a pipe.As the thermodynamic properties such as density varies with temp and pressure ,I wrote UDF for properties. my question is: 1.During writing udf for specific heat, as the specific heat is dependent to temp and pressure for calculating (((h))) integral from T_ref to T is required or it is calculated through c_p(T-T_ref)? 2. writing udf for turbulent viscosity,how can I call written udf for density to calculate turbulent viscosity(in DEFINE TURBULENT VISCOSITY)? thanks for helping me

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November 8, 2020, 14:43		#2
rewol Member Refik Join Date: Dec 2014 Location: Turkey Posts: 53 Rep Power: 11	1. Could you please explain your question a bit more clearer? Basically you have to calculate departure functions and add it to reference cp value. 2. Im assuming this is for FLUENT. You do not have to do anything for "turbulent viscosity". You have to write an UDF for laminar viscosity which will be utilized in viscosity calculation along with turbulent viscosity. Also thermal conductivity should be modeled. I can help further if you need. Refik