Assessment of fractional collection efficiency in louvered inertial particle classifiers

Design of louvered particle classifiers, from cylindrical commercial scale, Frain (2000), to rectilinear laboratory scale, Okada et al. (1970), Alekseev et al. (1972), requires particle fractional collection efficiency η. Together with particle Stokes number St1/2, how does geometry of louver array including louver orientation, size, and spacing, affect η?110