Transient behavior of the bed collapse after shut-off the gas supply into a three-phase fluidized bed was determined. Experiments were carried out in a 210-mm diameter half-tube acrylic column having a 1.8 m-high test section. The polymer beads (dp=3.2 mm, ρs=1,280kg/m3) were fluidized by cocurrent flow of deionized water and air. The transient behavior of the bed collapse after cut-off the gas supply to the bed was monitored by a video camera (30 frames/s). The dense bed surface height was measured from the image of videotape. At lower liquid velocity, the dense bed surface increases with the elapsed time and then reaches a bed height, whereas at higher liquid velocity the dense bed surface increases sharply with the elapsed time, then decreases and reaches the bed height corresponding to the liquid-solid fluidized beds (water-polymer beads).
Bibliographical noteFunding Information:
This research work was supported by the faculty research fund from the SungKyunKwan University, 2002. The authors from the SungKyunKwan University wish to thank the Ministry of Education for partially financial support (BK-21 Project).
- Bed Collapse
- Dense Bed Height
- Dynamic Characteristics
- Three-Phase Fluidized Beds
ASJC Scopus subject areas
- Chemical Engineering(all)