******************************** **Porous Shell Gas Diffusivity** ******************************** :: Porous Shell Gas Diffusivity = {model_name} ----------------------- **Description / Usage** ----------------------- This card is used to set the gas diffusivity for the trapped gas in the porous_sat_closed equation. Basically, the gas trapped in closed pores during the imbibition process is allowed to diffuse into the liquid, and this property is a part of that model gas inventory equation R_SHELL_SAT_GASN. Only one model is available for this property: +--------------------------+-------------------------------------------------------------------------------------+ |**CONSTANT** |This model applies a constant cross-region permeability. It requires a single | | |floating point input: | | | | | | * is the cross region permeability | +--------------------------+-------------------------------------------------------------------------------------+ |**EXTERNAL_FIELD** |This model applies a constant gas diffusivity. It requires a single floating point | | |input: | | | | | | * is the gas diffusivity (L2/t) | +--------------------------+-------------------------------------------------------------------------------------+ ------------ **Examples** ------------ Porous Shell Gas Diffusivity = CONSTANT 1.e-5 -------------- **References** -------------- S. A. Roberts and P. R. Schunk 2012. in preparation.