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Abstract
This is an experimental study on the drag reduction phenomenon in a gas-particle suspension two-phase flow system. The purpose of the research was to examine the effect of static charges carried by the conveyed particles on the drag reduction characteristics of a flowing suspension in horizontal and vertical tubes. A specifically designed experimental loop was used to perform simultaneous pressure drop and particle charge measurements. The charge on the particles flowing in the system was artificially increased using high voltage rod-in-cylinder Corona chargers mounted in the closed loop. The particle charge was measured in a Farraday cage sampling device and the effective current generated by particle impact on a specially designed spherical nickel probe mounted in the two-phase flow was also recorded.
It was found during the measurements that the pressure drop in the vertical test section was not significantly influenced by the charge build-up on the flowing particles, while the results obtained in the horizontal test section showed a significant effect on the drag due to charged particles. The electric charge on the particles was shown to have a negative contribution on the drag reduction: the higher the value of the effective charge, the higher the drag increase, i.e., the smaller the drag reduction.