Porous Latent Heat Fusion#

Porous Latent Heat Fusion = CONSTANT <integer> <float> [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.

  • <integer> - the species equation of liquid phase solvent; MUST BE SET TO ZERO for now.

  • <float> - 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.