Phase Transformation Latent Heat
The heat rate Q0 that is released during a phase transformation is characterized by the enthalpy per unit volume (see Ref. 5). The heat rate that is associated with the transformation of a source phase into a destination phase can be expressed as
(3-38)
The heat rates that result from each phase transformation are added, and they can be used as a heat source when solving the heat equation. A weak contribution is added to the weak form of the heat equation:
where is the sum of the contributions Q0 from each phase transformation (Equation 3-38), and T is the temperature degree of freedom used in the Heat Transfer in Solids interface.