Fundamental study of the motion of charged powder particles by using electric curtain

The electric curtain consisting of a parallel cylindrical electrodes was constructed. An electric field of standing wave type was produced with superposition of both single-phase AC and DC voltage. Although each particle showed a stationary up-and-down motion within a confined region, as a whole fan-like pattern of particle motion was observed over electrodes. The shape of the pattern was changed with the applied voltage of either AC or DC, or both. The measurement of the amount of charge of suspended particles showed that the particles over grounded electrodes have a positive polarity and the particles over high voltage electrodes have a negative one.<>