How do I input diffusion coefficient?

    • zdfrankman
      I would like to change the diffusion coefficient of a fluid to model a species diffusion through a membrane. In the above image, the material window shows that there is no diffusion coefficient parameter on the materials database.
      However, the handbook specifies that there should be a diffusion coefficient parameter to modify. Section 7.9.5. specifies "You will define or for each chemical species using the Create/Edit Materials Dialog Box.  Setup →  Materials. The diffusion coefficients have units of /s in SI units or /s in British units."

      How do I input the parameters?
      I have previously tried to simply alter the molecular weight and L-J characteristic length of the material, as these are components of the Einstein diffusion coefficient. However, altering these parameters had no impact on the diffusion rate in my simulation.

      Thank you!
    • Swathi V. V.
      Ansys Employee


      The mass diffusion coefficient for the species can be defined in the mass diffusivity input available in mixture material property.  Please see the screenshot below.




Viewing 1 reply thread
  • You must be logged in to reply to this topic.