Abstract
ABSTRACT rp HIS paper contains the discus-1 sion of a novel technique for monitoring the mass flow rate of particulate solids, specifically of grain. Microwave Doppler radar was used to monitor velocities and densities of the flow field. Experiments were per-formed to extract information from the Doppler signal about the average bulk velocity and the average bulk density of particulate solids. Experi-mental results of monitoring flow rates of gravitational flow of wheat in a prototype system are presented. As a result of this research it has been concluded that the average RMS value and the average frequency of the Doppler signal are proportional to the average bulk density and the average bulk velocity of flowing grain respec-tively. When the cross-section area of the flow field, which depends upon the calibration of the flowmeter, is known, this system provides continu-ous and contactless means of monitor-ing the mass flow rate of particulate solids.
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