The multiphase version of the total energy equation generalizes Equation 1–85:
 | (5–119) |
The multiphase version of the thermal energy equation for static enthalpy (incompressible and low speed compressible flows only) generalizes Equation 1–92:
 | (5–120) |
where:
, 
, 
,
denote the static enthalpy, the temperature, and the thermal conductivity
of phase 
.
represents
the internal energy of phase 
, although the variable is still
called Static Enthalpy in CFD-Post.
describes external heat sources. For details, see Sources.
denotes interphase
heat transfer to phase 
across interfaces with other phases.
For details, see Inhomogeneous Interphase Heat Transfer Models.The term
(5–121)
represents heat transfer induced by interphase mass transfer. For details, see Interphase Mass Transfer.