Monitoring electrostatic flow noise for mass flow and mean velocity measurement in pneumatic transport

Abstract This paper presents experimental results of research on the electrostatic, non-contact measurement of the mass flow rate and mean flow velocity of solids in pneumatic transport lines. We also describe a microprocessor-based system, based on the measurement method, that had been built to be installed in industrial installations. The system permits rapid 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, described in this paper, provides experimental verification of the measuring system. Results obtained for two different materials (aluminosilicate and granulated polypropylene) show the relationships between the effective values (RMS) and mean values of rectified electric signals induced in the measuring probes by the flow of charged solid particles and the mass flow rate of those particles for different mean flow velocities.

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