Shape and extent of the void formed by a horizontal jet in a fluidized bed

✍ Scribed by Libin Chen; Herbert Weinstein

• Publisher: American Institute of Chemical Engineers
• Year: 1993
• Tongue: English
• Weight: 626 KB
• Volume: 39
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690391202

✦ Synopsis

The introduction of reactant gas into a fluidized-bed chemical reactor as a jet is a common design practice. However, the shape and extent of the void formed by a jet into a fluidized bed and the manner in which the void breaks up into bubbles have still not been described well. An experimental study of a horizontal jet into a 15 cm by 38 cm cross-section fluidized bed was carried out using an X-ray system. Instantaneous solid fraction averaged along 15-cm chords across the bed were measured. The mean value and the fluctuating component of solid fraction were determined for two initial jet diameters, 0.64 and 1.27 cm, and three initial jet velocities, 23, 46 and 69 m/s. Maps of the mean solid fraction and of statistical properties of the fluctuating component show that there are three discernible regions in the jet-influenced area of the bed. These are a coherent void, bubble trains, and a surrounding compaction zone.

'Measured value.