ArticleScientific reports2025
An experimental insight of the hydrodynamics of microjet assisted fluidized bed of ultrafine particles.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Strong interparticle forces (IPFs) in ultrafine powders lead to agglomeration and poor fluidization quality posing a major challenge in many industrial processes. This study investigates the use of a high-energy microjet to improve the fluidization of nanosilica. A 200 μm nozzle was used to inject a secondary flow at a sonic velocity of 312 m/s, creating intense, localized turbulence. Analysis of local pressure drop transients confirmed that this energy input effectively de-agglomerated the powder, particularly in the lower bed. The combination of the microjet with a primary inlet gas flow produced a substantial improvement in fluidization, achieving a maximum bed expansion of approximately ten times the initial height. Furthermore, by conducting successive runs, we demonstrated a significant persistence effect. The bed retained its improved hydrodynamic characteristics, responding more rapidly in subsequent runs, implying an irreversible microjet-induced change in the powder's agglomerate structure.
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