Journal
ADVANCED POWDER TECHNOLOGY
Volume 25, Issue 1, Pages 331-337Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apt.2013.05.013
Keywords
Flow pulsation; Bed collapse; Pressure drop; Transient response; Assisted fluidization
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Funding
- KACST [08-PET297-02]
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An important class of assisted fluidization techniques, which are neither energy-intensive nor suffer from post-processing issues, is based on pulsation of inlet gas flow to the fluidized bed. Collapse experiments have been carried out in a pulsed-flow fluidized bed containing a widely used nano-powder that shows strong agglomeration behavior. Pulsation in the inlet air flow was introduced using 0.1 Hz frequency square wave that controlled opening and closing of a solenoid valve. Transients of the total pressure-drop across the bed were carefully recorded using fast-response pressure transducers connected to a data acquisition system. Flow transients were also monitored during the bed collapse. Average size of nanoparticle agglomerates was computed using a mathematical model reported in the literature. Flow pulsation was found to substantially reduce the average agglomerate size of the nano-powder. (C) 2013 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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