Title :
Continuous non-contact measurement of electric charges of solid particles in pipes of pneumatic transport. I. Physical and mathematical models of a method
Author :
Gajewski, Juliusz B.
Author_Institution :
Inst. of Heat Eng. & Fluid Mech., Tech. Univ. of Wroclaw, Poland
Abstract :
Physical and mathematical models are derived from an analysis of moving charged solid particles in pneumatic-transport pipes and their effect on an inductive ring probe (electrostatic transducer). The probe is connected to the high-resistance input of a specially designed amplifier through an electric circuit consisting of a capacitor of a high capacitance value. The effect of the voltage drop on the input impedance of the amplifier is proportional to the electric charge generated on solid particles during a flow in a pipe. The capacitor also makes it possible to attenuate or even eliminate the effect of electrical interference on the charge measurement. The interference results from the charging of a dielectric section of a pipeline by impacting solid particles.<>
Keywords :
charge measurement; electric sensing devices; electrostatic devices; flow measurement; transducers; amplifier; capacitor; electric charge measurement; electrical interference; electrostatic transducer; inductive ring probe; measurement theory; models; pipe flow; pneumatic-transport pipes; Capacitors; Circuits; Current measurement; Electric variables measurement; Electrostatic analysis; Electrostatic measurements; Mathematical model; Probes; Solids; Transducers;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96908
