Abstract
Electrification of gas—solid suspensions flowing in steel and insulating-coated pipes are experimentally studied. It is found that the currents generated on insulating-coated pipes are higher than the currents generated on a steel pipe and the sign of the currents follows a kind of tribo-electric series. The currents are proportional to powder flow rate, proportional to mean air velocity to the power 1.4–1.9, and inversely proportional to the mean particle diameter. It seems that the currents are proportional to the pipe diameter. The effects of a bend and powder feeding inlet are also studied.
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