アクリル粒子の含水率による流動層中の帯電に及ぼす影響についての研究

抄録

Electrification between PMMA particles and aluminum pipe during fluidization have been investigated for different Initial water content of the surface of the particles. The dried particles moved strongly up and down immediately after fluidization while the channeling and the slugging flows were observed for humidified ones. Although the dried particles had initially negative charge, the particles had positive charge below the initial position of the packed bed because of the emission of water content on the particle surface during fluidization. The humidified particles had negative charge even if the emission of water content could be occurred. When the preservation interval of the dried particles in the paper bag got longer, they had negative charge. As the surface state of the particles was changed by adsorption of water little by little in the paper bag, the contact potential difference between the PMMA particles and the wall of the aluminum pipe changed.