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Transient discharge of solid particles from upper outlet of vertical bubble columns
Author(s) -
Hidaka Nobuyuki,
Kakoi Kazuhiro,
Matsumoto Toshitatsu,
Morooka Shigeharu
Publication year - 1995
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690410807
Subject(s) - transient (computer programming) , bubble , dispersion (optics) , mechanics , sedimentation , chemistry , column (typography) , materials science , particle (ecology) , effluent , analytical chemistry (journal) , chromatography , geology , optics , geometry , environmental science , physics , oceanography , mathematics , connection (principal bundle) , sediment , environmental engineering , computer science , operating system , paleontology
Sieved glass beads of 230, 280 and 470 μm dia. were steadily suspended by upward concurrent gas and liquid flows in vertical bubble columns of 7 cm dia. and 4.85 m height or 15 cm dia. and 2.7 m height. Then the liquid velocity was suddenly increased to a higher value, which caused an unsteady‐state discharge of solid particles from the top of the column. The transient discharge rate was determined by collecting solid particles in the effluent, and transient axial distributions of gas and solid holdups along the column length were measured by sectioning the column with horizontal shutter plates just after stopping gas and liquid flows. A 1‐D sedimentation‐dispersion model was applied to describe the unsteady‐state discharge rate of solid particles as well as the change in gas and solid holdups in the columns. The model developed successfully expressed the transient behavior of solid particles over entire columns consisting of dense and dilute regions.