sAnalytical and Experimental Study of the Air Recirculation in a Loading Porous Tube with a Combined Bypass Chamber

The present paper considers the stream of air entrained by a stream of free-falling material in a vertical porous loading tube contained in a tube of large radius (bypass chamber). The ascending air in the bypass chamber is recirculated through both holes uniformly perforated in the chute walls and end holes at the ends of the bypass chamber. The parameters providing the greatest decrease in the volume of ejected air due to recirculation have been determined by solving the differential equations of motion of ejected air (entrained by the stream of free-falling material) and of recirculated air. The effect of decrease in the volume of ejected air due to the air recirculation in the "loading tube–bypass chamber" system has been confirmed experimentally.