Bubble phase voidage and dense phase voidage in thin two-dimensional fluidized beds

✍ Scribed by Po Lock Yue; Lucio Rizzuti; Vincenzo Augugliaro

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 740 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)85211-3

✦ Synopsis

Bubble phase and dense phase voidages have been studied in a series of thin two-dimensional fluidized beds using a light transmission technique. It is proposed to divide the bubble phase voidage into a "visible" and an "invisible'* portion with respect to light transmission. The variation of visible bubble phase voidage with bed thickness follows a logarithmic relationship. The analysis is especially relevant for the design of fluidized photoreactors. The effects of flow rate, particle size and bed thickness on bubble phase voidage have been examined. Average dense phase voidage, which varies with flow rate and particle size was found to exceed that at minimum fluidization in many cases. The present results show that variable dense phase porosity found in three-dimensional fluidized beds is also present in flat fluidized photoreactors.