In the above equation, mc and ms are the masses of the collected
particles in the coarse and fine sides, respectively. The particle size
frequency distributions for each size range are indicated by fc and fs.
Particle size distributions were measured by Laser-light scattering
(Horiba Co., Ltd. LA-920). The experimental error in the partial
separation efficiency was about 3%. A ring nozzle-type particle disperser
(Nisshin Eng. Co., Ltd.) was installed after the screw feeder. The test