摘要
本文研究了紊流条件下粗粒与细粒颗粒群间的相互作用,提出“粗粒效应”理论,包括三种作用机理:粗粒的载体作用,以漩涡微尺度λ_0为理论判据;粗粒的助凝作用,以颗粒雷诺数Re_p为理论判据;粗粒的中介作用,以裂解频率f_B为理论判据。λ_0值对应于最佳载体粒度,Re_p大,助凝作用大,f_B大,裂解作用大。
The interactions between coarse and fine particles in turbulent flow have been studied in
this paper. The theory of coarse particle effects has been proposed which includes three
mechanisms, i. e. the carrier effect of coarse particle with eddy microseale λ_0 as a criterion;
promoting-aggregation of coarse particle with grain Reynolds number Re_p as a criterion;
medium-breakage with breakage frequency f_B as a criterion. The λ_0 value is corresponding to
best carrier size; promoting-aggregation and medium-breakage are increased, respectivly, with
the increase of values of Re_p and f_B.
基金
国家自然科学基金
关键词
颗粒
相互作用
粗粒效应
浮游选矿
flotation
particles
interactions
coarse particle effects
