The basic steps for setting up a problem involving species transport are listed below.
Enable species transport, and specify the species to be included in the calculation.
Check and/or set the properties of the individual species in the model (for example, viscosity, specific heat).
Set species concentrations for the objects in your model.
In many cases, you will not need to modify any physical properties of individual species because Ansys Icepak will use the species properties specified in the materials database. Some properties, however, may not be defined as you want them in the database. You may also want to check the database values of other properties to be sure that they are correct for your particular application. The properties of a species can be viewed and/or edited using the Materials panel (see Editing an Existing Material). You can also create a new material as described in Creating a New Material.
For each of the species (that is, fluid materials) in the model, you (or the database) must define the following physical properties:
volumetric expansion coefficient, which can be a function of temperature
molecular weight which is used in the gas law and/or in the calculation of mole-fraction inputs or outputs
thermal conductivity and specific heat (in problems involving solution of the energy equation), which can be functions of temperature or (for thermal conductivity only) velocity
mass diffusion coefficients, which govern the mass diffusion fluxes (Equation 40–8 and Equation 40–9), and can be a function of temperature
Descriptions of these property inputs are provided in Editing an Existing Material.