***************************** **Porous Latent Heat Fusion** ***************************** :: Porous Latent Heat Fusion = CONSTANT [E/M] ----------------------- **Description / Usage** ----------------------- This required card is used to specify the model for the latent heat of fusion (or freezing) for each liquid solvent species in a partially saturated porous media flow problem, viz. *Media Type* card set to **POROUS_UNSATURATED** or **POROUS_TWO_PHASE**. As of 6/13/2002, we only allow single liquid phase solvent and the porous enthalpy equation is being tested. Definitions of the input parameters are as follows: +----------------------------+-------------------------------------------------------------------------------------+ |**CONSTANT** |Name of the constant latent heat of fusion model. | | | | | | * - the species equation of liquid phase solvent; MUST BE SET TO ZERO for | | | now. | | | * - the value of the latent heat of fusion. | +----------------------------+-------------------------------------------------------------------------------------+ ------------ **Examples** ------------ The following is a sample input card: :: Porous Latent Heat Fusion = CONSTANT 0 1000.2 See the equation below for the diffusivity model that this card represents. ------------------------- **Technical Discussion** ------------------------- First order phase change involves the adsorption or expulsion of heat. This thermal effect is modeled through the porous energy equation (see *EQ* cards; this equation was under development and testing as this manual was being assembled) with a source term that depends on the evaporation/condensation rate. *Fusion* implies a liquid to solid transition. It is envisioned that this card will someday be used for porous flow in mushy zones of solidifying metals, or the freezing of water in a porous solid. -------------- **References** -------------- No References.