7.6.15.11.1. Bkw_Mmp

Syntax: Pore Gas Density [{of} SpeciesName] = Bkw_Mmp (Initial_Gas_Density = initial_gas_density | Rho_C_Init = rho_c_init | B_Init = b_init | R = r | Covol = covol)
Scope: Aria Material
Summary: Compute density from MMP model
Description: Computes the density form the MMP model, evaluated as $\rho = \rho_{go}(\frac{{r_{o}}}{r})^3 + \rho_{co}(1-S_f)(\frac{(b_{o})^3-(r_o)^3}{(r^3)})$ . Here, $\rho_{go}$ is the initial gas density, $r_{o}$ is the initial pore radius, $r$ is the current defect radius, $\rho_{co}$ is the initial condensed density, $S_{f}$ is the normalized solid mass fraction and $b_{0}$ is the initial half distance between pores. The defect radius $r$ incorporates both chemical decomposition and mechanical distortion