Questions about MFIX
 

hi every one
I am an Mfix user,
I don't know how to treat these in MFIX:

TERMINAL SOLID CONCENTRATION
and
epsilon star_solid
and how BC_mass like this BC_MASSFLOW_s(2,1)= @(PI*20.*20.*5.0)

is related to MASSFLOW in kg/m^3

i would be grateful if someone helps me...