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. The conducted studies are aimed at improving the theoretical basis for design of ventilated suction hoods of bulk material transfer groups, i.e. the most typical and common sources of dust emissions in reprocessing of dust-forming materials.Unsteady processes occur in the chute at the equipment start-up or short-time loading of bulk material. Assess the force action exerted by the flow on air for two cases: at an instantaneous change and a gradual one (smooth) in the material flow. `It was theoretically demonstrated that at instant chuting of a heated bulk material an increase in the induction pressure is strongly related with a variation in the transferred material flow, and due to a considerable inertness of the intercomponent heat exchange temperature variations are far behind of variations in the transferred material quantity. A gradual variation in the flow rate of particles at the beginning and at the end of a material transfer is associated with excessive (peak) pressures against steady-state values. This is explained by the maximum induction head at a certain material flow rate. There are no pressure surges if the material flow rate does not reach the necessary value.

AERODYNAMICS OF AN UNSTEADY PARTICLE FLOW IN THE CHUTE