Determination of velocities and flow patterns of particles in mass flow hoppers

An instrumentation set-up for the determination of particle velocities and flow patterns in mass flow hoppers is described. The set-up includes a pressure-sensitive radiopill as flow tracer, ferrite antenna system, transistorised tuned amplifier and potentiometric recorder. A typical trace obtained from an experimental run is included to illustrate the determination of the velocity and position of the particles. © 1973.