抄録
The potential distribution profiles in a naturally charged fluidized bed have been measured for various particle materials, particle sizes from 200 to 540μm under humidity controlled conditions of 5 to 65% for acryl and iron towers of 6.7cm in diameter. In addition, the potential on the inner surface of the acryl tower was first observed by installing five proves at different heights.
It has been observed that the acryl tower as well as the bed could be highly charged up to ten kilo-volts. From this measurement, the main charge source of electric potential that happend to be detected in previous works was reasonably confirmed. For the purpose of reviewing the measurements included in the present work, numerical calculation of potential distribution profiles has been done by the ordinary iteration method. Comparison shows that the present potential measuring technique still has some defects which need to be improved. Nevertheless, measured values seem to be valid, at least, as far as their order is concerned.
Besides this, calculated result gives an insight into dead space and channelling formation due to the electrostatic adhesive force. It can be emphasized that the electrostatics generated in a fluidized bed will cause irregular fluid motion for a large scale bed with nonconductive particles.
