Abstract
To study the phenomenon of particle dispersion in the air flow in a pipe, the particle flux distribution using variously shaped particles were measured. The following results are obtained: 1) The dispersion coefficient of the particles in the first turbulent diffusion zone, is 0.5-1.3 times of that of the air flow. 2) The disperion coefficient of the particles in the second turbulent diffusion zone, is (1.9-8.6)×10-4m2/s when the mean air velocity is 4-18m/s. 3) As the particle size becomes larger the dispersion coefficient of the spherical particles decreases. But if irregularly shaped particles are used, the dispersion coefficient of the particles. does not always decrease. 4) The delay time of dispersion is known in the empirical formula of the function of dk/U
