Measurement of solids velocity in a conical Hopper by mass tracer particles

Nedderman's method is used and developed to measure particle velocity insid e a conical hopper by placing a mass of host particles, which dyed a differ ent color, into an initially static bed. The velocities of glass beads and sand particles of different sizes were measured in a steel hopper and a Per spex hopper. The effect of wall friction on the solids flow was also invest igated by increasing wall roughness with sandpaper stuck on the inside hopp er wall. (C) 1999 Elsevier Science Ltd. All rights reserved.