Experimental fluid dynamics of particles in a dielectric barrier discharge plasma-enhanced spouted bed

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Japan, 2021-03, Vol.32 (3), p.832-840
• Main Authors: Zhang, Baiqiang, Kobayashi, Nobusuke, Itaya, Yoshinori, Ono, Kyosuke, Suami, Akira, Nakagawa, Tsuguhiko
• Format: Article
• Language: English
• Subjects: AC-DBD plasma; Fluid dynamics; Particle velocity profile; PIV method; Slot-rectangular divergent-base spouted bed
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2021.01.020

[Display omitted] •The vertical velocity profile of solid particles enhanced along longitudinal direction.•The influence on particle velocity was different from particle type with plasma.•The electron temperature of plasma was declined with the addition of particles. This study proposed the fluidized particles with dielectric barrier discharge (DBD) plasma in a slot-rectangular divergent-base spouted bed and focused on the dynamics of solid particles with the plasma irradiation. Two bed materials (Polypropylene (PP) particles and Polyamide (PA) particles) with same diameter (3 mm) were fluidized in this study. Fluidization parameters included gas velocity (7.4–14.9 m/s), particle amount (100–500), and plasma parameter (apply voltage, 0 and 7 kV) as the applied voltage were investigated here. Particle velocity profiles were analyzed through the methods of particle image velocimetry (PIV) and particle tracking velocimetry (PTV). Results show that the particle velocity was increased with the plasma irradiation, mainly by the enhancement in the vertical direction. The location of the highest particle velocity area related to the fluidization behavior of particles. With the increase of superficial gas velocity, the location of the highest particle velocity area raised along the central line but not reached the top of the solid bed. While the electron temperature of Ar plasma decreased with the addition of particles. Two electric fields (external electric field and surface charge electric field) presenting in the system were assumed to give the reason for the changes of the particle fluid dynamics.