1.6.2. Diffusive Transport Equations for Additional Variables

The general form of the diffusive transport equation for an Additional Variable (non-reacting scalar) is:

(1–176)

where:

  • is the mixture density, mass per unit volume.

  • is the conserved quantity per unit volume, or concentration.

  • is the conserved quantity per unit mass.

  • is a volumetric source term, with units of conserved quantity per unit volume per unit time

  • is the kinematic diffusivity for the scalar.