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[617283443]

Dear experts!

I am using FLuent to simulate a flow heat transfer problem for a mixture of high pressure water and supercritical oxygen. Inside the pipe is a mixture of high pressure water and supercritical oxygen (temperature 20°C, pressure 24MPa).The model I am using is a Species Model(Species transport model).The relationship between the density, specific heat capacity, thermal conductivity, viscosity and temperature of the high pressure water and supercritical oxygen is piecewise-lineare.I would like to know how to select Mass Diffusivity model in the Mixture-template? There are 5 Mass Diffusivity models in total, constant-dilute-appx;dilute-approx;unity-lewis-number;kinetic-theory;multicomppnent;user-defined.After selecting the Mass Diffusivity model, the How to set reasonable parameters?

Thank you inadvance！

[Rob]

You'll need to set those based on the mixture needs; I typically use multicomponent for "normal" mixtures and take the value from literature.