Transient discharge of solid particles from upper outlet of vertical bubble columns

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · AIChE Journal

DOI:https://doi.org/10.1002/aic.690410807· OSTI ID:106220

Hidaka, Nobuyuki; Kakoi, Kazuhiro; Matsumoto, Toshitatsu ^[1]; Morooka, Shigeharu ^[2]

---

1. Kagoshima Univ. (Japan). Dept. of Applied Chemistry and Chemical Engineering
2. Kyushu Univ., Fukuoka (Japan). Dept. of Chemical Science and Technology

Three-phase fluidization is an important technique for contacting gas, liquid, and solid particles and is widely used in petroleum and biochemical processes. Sieved glass beads of 230, 280 and 470 {micro}m 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. 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.

• OSTI ID: 106220
• Journal Information: AIChE Journal, Journal Name: AIChE Journal Journal Issue: 8 Vol. 41; ISSN 0001-1541; ISSN AICEAC
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FLOW MODELS
FLOW RATE
FLUID MECHANICS
FLUIDIZED BEDS
MULTIPHASE FLOW
ONE-DIMENSIONAL CALCULATIONS
UNSTEADY FLOW