Constant-fractional-lag model for axisymmetric two-phase flow

Comment on 'Simple modeling of particle trajectories in solid rocket motors'

“…The dimensionless axial velocity profiles may be obtained easily 4 (1) (2) for the rotational flow. Where V h is the flow velocity at the propellant burn surface, r {) is the radius of the burn surface, and X and R are the dimensionless axial and radial coordinates normalized with r () .…”