Researches on Divided Flow Characteristics in Conveying Particles by Air Stream (1st Report)

Abstract

In all the designs of air transport ducts, it is necessary to know the divided-flow characteristics when particles are flowed by air streams from a main duct to branch ducts. Then, in this report, we flowed particles through the rectangular air duct installed horizontally and studied the divided-flow characteristics between particles and air. As a result, the following conclusions have been reached : i) When particles are to be conveyed from a horizontal main duct to branch ducts, we can hardly attain our object of the divided-flow by air regulation alone, unless we install a damper at the take-offs of a duct. ii) If we install a damper at the take-offs of a duct and use together with the control of the air flow rate, we can regulate comprehensively the flow rate of particles. iii) We got a damper angle offering maximum divided-flow rate of particles for a given air flow, and showed experimental formulae concerning the damper angle and the divided-flow rate of particles.