Where can I find the specific equations for these parameters?

MFiX
#1

hello everyone:
Where can I find the specific equations for these parameters?
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#2

The MFiX user guide and the source code are the definitive references.

Additionally you may find the “MFiX Theory Guide” helpful, although it is not up-to-date.

https://mfix.netl.doe.gov/doc/mfix-archive/mfix_legacy_manual/Theory.pdf

#3

Fluid phase

Molecular weight

physprop_mod.f:
!  Module name: CALC_MW (X_g, DIM, L, NMAX, MW_g)                      C
!  Purpose: Calculate average molecular weight of gas                  C

set_mw_mix_g.f: 
!  Subroutine: SET_MW_MIX_g                                            C
!  Purpose: calculate gas mixture molecular weights                    C

Thermal conductivity

calc_k_g.f:
!  Subroutine: CALC_K_g                                                C
!  Purpose: Calculate the effective conductivity of fluid phase        C

Diffusivity

calc_dif_g.f
!  Subroutine: CALC_DIF_g                                              C
!  Purpose: Calculate the effective diffusivity of fluid phase in      C

I found these by looking at the keyword associated with the control (mw_avg, c_pg0, k_g0, and dif_g0) and then using grep -ir <keyword> in the $CONDA_PREFIX/share/mfix/src/model directory