### 5.7.1. Phasic Equations

The multiphase version of the total energy equation generalizes Equation 1–86:

| (5–119)

The multiphase version of the thermal energy equation for static enthalpy (incompressible and low speed compressible flows only) generalizes Equation 1–93:

| (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.

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