MONITORING ELECTROSTATIC FLOW NOISE FOR MASS-FLOW AND MEAN VELOCITY-MEASUREMENT IN PNEUMATIC TRANSPORT

This paper presents experimental results of research on the electrosta tic, non-contact measurement of the mass flow rate and mean flow veloc ity of solids in pneumatic transport lines. We also describe a micropr ocessor-based system, based on the measurement method, that had been b uilt to be installed in industrial installations. The system permits r apid mass flow rate and mean flow velocity measurements in quasi-real time. The method is based on the phenomenon of electrostatic induction - the effect of the flux of charged solid particles flowing in a pipe on measuring ring probes (inductive transducers). The research, descr ibed in this paper, provides experimental verification of the measurin g system. Results obtained for two different materials (aluminosilicat e and granulated polypropylene) show the relationships between the eff ective values (RMS) and mean values of rectified electric signals indu ced in the measuring probes by the how of charged solid particles and the mass how rate of those particles for different mean how velocities .