✦ LIBER ✦

Mechanics of particle motion in three-phase flow

✍ Scribed by Lj. Kundakovic; G. Vunjak-Novakovic

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 813 KB
Volume: 50
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(95)00162-x

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✦ Synopsis

Abstrac~Flow behavior of three-phase flow was studied using a two-dimensional draft-tube fluidized bed operating with air, water and alginate particles (ds = 2.5 mm, Ps = 1040 kg/ma). Momentum transfer between a particle and three-phase flow was assessed from settling velocities of tracer particles with diameters of 2.5 and 5 mm, and densities 1100-2500 kg/m 3. The settling velocities of tracer particles were systematically lower than the corresponding free-settling velocities, as a result of additional momentum transfer with air bubbles and fluidized bed particles. These effects were separated by comparative studies of particle settling in two-phase and three-phase flow. Mechanics of particle motion in three-phase flow was modeled in terms of the effective particle buoyancy and the effective drag coefficients.

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