Electrostatic phenomena of particles may have a variety of applications. Here, a new measuring method of powder flow rate in gas-solids pipe flow was developed based on the electrification of particles. The powder flow rate was successfully calculated by use of the electric currents generated from the pipe wall. It was found that the effect of initial charge of particles on the measurement could be eliminated by use of two metallic pipes whose inner surfaces were coated with different materials. It was also found that the powder flow rate and the mean particle-charge could be successfully measured simultaneously.
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