The Dispersed Phase Transport of Diluted Species interface is used to calculate the concentration of one or several a dilute solutes present in a dispersed phase in a fluid with multiple immiscible phases. Transport and reactions of the species within the continuous phase can be handled with this interface. The driving forces for transport can be convection by the dispersed phase velocity, diffusion by Fick’s law, and turbulent diffusion, when the interface is used in a The Dispersed Two-Phase Flow, Diluted Species Coupling Feature.

The interface supports simulation of species transport in 1D, 2D, and 3D as well as for axisymmetric components in 1D and 2D. The dependent variable is the molar concentration, c. Modeling multiple species transport is possible, whereby the physics interface solves for the molar concentration, ci, of each species i. It should be noted that the concentration solved for is the total concentration

comprised of the phase volume fraction, ϕd, and the dispersed phase concentration cd,i. For each concentration solved for, the interface defines a variable tds.phs_<concentration> corresponding to the phase concentration (cd,i). This can be used in boundary conditions and reaction rate expressions when the phase concentration is to be prescribed or used.

The Dispersed Phase Transport of Diluted Species interface is a version of the Transport of Diluted Species interface. Except for the transport mechanism settings described below, the interface settings are identical to those available in the The Transport of Diluted Species Interface.

Mass transport due to diffusion is always included. Use the check boxes available under Additional transport mechanisms to control other transport mechanisms.