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-   -   Material Properties for Sat. Liquid and Sat. Vapor (http://www.cfd-online.com/Forums/fluent/107104-material-properties-sat-liquid-sat-vapor.html)

Blackhawks84 September 17, 2012 19:11

Material Properties for Sat. Liquid and Sat. Vapor
 
Hello everyone,
I am looking to see if my Material Properties are correct for my simulation. I am doing bubble growth due to boiling. I have patched a small hemisphere as vapor for the starting point with UDFs guiding the rest. I want my temperature of vapor and liquid to be 373.15 K. I have the wall at a higher temperature. This post is mainly about the material properties for saturated liquid and saturated vapor at atmospheric pressure. I have the two materials as h2o liquid and h2o vapor. I want to make sure that the changes I have made to the material properties are correct.

(All material properties were founded from Fundamentals of Heat and Mass Transfer - 6th Edition Incropera - Appendix A.6 pg 949 - Properties of Saturated Water)

This is what I put into Fluent (All properties are CONSTANT):
I am unsure of Standard Enthalpy and Reference Temperature.
The heat of vaporization that I am using 2257 kj/kg.

Properties of Saturated Water at 373.15 K:
Material: water-liquid h2o<l>
Density: 957.8544 kg/m^3
Cp: 4217 j/(kg*K)
Thermal Conductivity: 0.68 W/(m*K)
Viscosity: 0.000279 kg/(m*s)
Molecular Weight: 18.0152 kg/kgmol
Standard State Enthalpy: 419040 j/kg*18.0152 kg/kgmol
Reference Temperature: 373.15 K

Properties of Saturated Vapor at 373.15 K:
Material: water-vapor h2o
Density: 0.5956 kg/m^3
Cp: 2029 j/(kg*K)
Thermal Conductivity: 0.0248 W/(m*K)
Viscosity: 0.000012 kg/(m*s)
Molecular Weight: 18.0152 kg/kgmol
Standard State Enthalpy: 2676100 j/kg*18.0152 kg/kgmol
Reference Temperature: 373.15 K

The change in Standard State Enthalpy does come out to the heat of vaporization.
I have also changed the interaction surface temperature to 0.0589 N/m.
I have also patched the whole domain to the saturation temperature of 373.15 K.

Please let me know if this is a correct set up or if my properties are incorrect.

Thank you so much for all your help.
Bradley.


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