Dynamic characteristics of non-spherical particles generated by industrial processes deposited in the respiratory tract
In order to investigate the dynamic characteristics of non-spherical particles from the casting workshops deposited in the respiratory tract of workers,the microscopic morphology of dust particles was obtained by using electron microscopy scanning,the movement patterns of five non-spherical particles in the respiratory tract of G3～G6 and G9～G12 were analyzed by numerical simulations,and the effects of particle shape,respiratory volume,and particle size on deposition distribution of particles were discussed.The results showed that the larger the particle shape factor φ,the particle size or the expiratory volume was,the higher the deposition rate of particles ηt in the respiratory tract was.The smaller the particle shape factor φ was,the more dispersed the deposition distribution of particles in the G3～G6 airways was,and the opposite phenomenon appeared in the G9～G12 airways.Non-spherical particles in the G3～G6 airways were deposited mainly by inertial collisions,and were more strongly obstructed.The difference of deposition efficiency between particles with different shapes was significantly greater than that in the G9～G12 airways,and the difference of local deposition rates was more than 30％.Therefore,non-spherical particles with small shape factors were more likely to be transported to deeper locations in the respiratory tract,posing a greater health risk to workers.
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