A corona discharge probe system for measuring phase velocities in a dense suspension

Measurement of distribution of velocities of phases in pipe flow of a dense gas-solid suspension was facilitated by the use of an ion source in the form of a localized corona discharge and a downstream traversing electrostatic probe. The system utilizes the transient behavior of a corona discharge which provides a distinction of times of arrival of ions and solid particles of modified charges at a downstream probe. This probe system does not suffer the handicap of other available probe systems in a dense solid phase.