An experimental study was carried out to investigate the amount of the deposit of solid particles around an obstacle concerning with its shape and air velocity in a horizontal duct.
A plate whose length and angle to the horizontal surface were variable was placed in the duct which had dimensions of 20×100mm in section and 2m in length. Alumina particles were used as the sample, and their mean diameter was 27.4μ.
As the conclusion of this experiment, the following results were obtained.
In the case of π/4≤θ≤π/2, the amount of the deposit of solid particles around the plate, w, increased in proportion to l², μ_s^1.5 and θ/φ_r, and was represented by the following equation:
W=K⋅(R_e⋅F_r)ⁿ⋅(θ/φ_r)⋅μ_s^1.5 where, l: length of plate θ: angle of plate to horizontal surface μ_s: mixing ratio of alumina in air flow φ_r: angle of repose of alumina R_e: Reynolds number F_r: Froude number K and n: constants given by, R_e⋅F_r<7×10³; K=8.0×10³, n=-1.0 7×10³<R_e⋅F_r<4.5×10⁴; K=1.5×10^-2, n=0.5 4.5×10⁴<R_e⋅F; K=1.5×10⁷, n=-1.0

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Abrasieves used to grind metals and stones naturally wear the contact portion of the equipments such as crushers, screens and conveyors, during their manufacturing process. In the abrasive manufacturing equipments the parts wear even more rapidly than in the equipments designed for ordinary powders.
It is therfore considered that the abrasive manufacturing equipmets are the ones that are most seriously afflicted with the probrems of abrasion as compared with any other manufacturing egipments.
In this report, the data obtained from our actual operating performances were presented to discuss the probrems of abrasion.

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