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Local bubble behavior in three-phase fluidized beds

✍ Scribed by Z. Chen; C. Zheng; Y. Feng; H. Hofmann


Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
339 KB
Volume
76
Category
Article
ISSN
0008-4034

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✦ Synopsis


Bubble behavior, including bubble Sauter diameter, bubble rise velocity, bubble frequency and local gas holdup in different radial and axial positions, was measured using a dual electro-conductivity probe in air-water-glass beads fluidization systems. It has been found that the bubble characteristics differ significantly in various flow regimes, depending on the operating conditions; the radial distribution of bubble parameters also changes from one flow regime to another. Thus, it is necessary to employ local bubble behavior in the modeling of three-phase fluidized beds.

Le comportement des bulles, et notamment le diametre des bulles de Sauter, la vitesse d'ascension des bulles et la retention de gaz locale dans des positions radiales et axiales differentes, a ete mesure a I'aide d'une sonde d'electroconductivite duale dans des systemes de fluidisation a billes air-eau-verre. On a trouve que les caracteristiques des bulles variaient de faqon significative dans divers regimes d'ecoulement selon les conditions de fonctionnement; la distribution radiale des parametres des bulles change avec le regime d'ecoulement. C'est pourquoi le comportement des bulles local est a inclure dans la modelisation des lits fluidises triphasiques.


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## Phase Holdups in Three-Phase Fluidized Beds The local bubble frequency, the local phase holdups and the local bed porosity in three-phase fluidized beds were measured. Air, water, and 250 pm glass beads were used as the gas, liquid, and solid phases. The effects of gas and liquid velocities on