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Fluidization at vacuum conditions. A generalized equation for the prediction of minimum fluidization velocity

โœ Scribed by M.F. Llop; F. Madrid; J. Arnaldos; J. Casal

Book ID
104107566
Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
626 KB
Volume
51
Category
Article
ISSN
0009-2509

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โœฆ Synopsis

The hydrodynamical behaviour of fluidized beds at reduced pressures is studied. The minimum fluidization velocity is strongly influenced by pressure, decreasing as pressure increases. The well-known equation of Wen and Yu and two equations proposed for the calculation of u,, I at reduced pressures are tested; the comparison with experimental data shows that they can be applied only over restricted pressure ranges. The relationship between flow rate, pressure and pressure drop at conditions ranging from high vacuum to high pressure is analysed for the different flow regimes (molecular, slip, laminar, transition and turbulent). A generalized equation is found which predicts fairly well the value of Uml at vacuum conditions, atmospheric pressure and high pressures.

๐Ÿ“œ SIMILAR VOLUMES

On a generalized expression for predicti
On a generalized expression for prediction of minimum fluidization velocity
โœ G. Narsimhan ๐Ÿ“‚ Article ๐Ÿ“… 1965 ๐Ÿ› American Institute of Chemical Engineers ๐ŸŒ English โš– 481 KB ๐Ÿ‘ 2 views

Fig. 3. Expansion of beds of glass beads. A-Reference I, glass beads, 70 to 80 mesh; eSS N 0.66; h,, = 14.2 cm.; hi = 26 cm.; diameter of the column = 50 mm. B-Reference 3, glass beads, 20 to 25 mesh; ess = 0.40; h,, = 23.8 cm.; hi = 51.8 cm.; diameter of the column = 35 mm. -Piston flow. ----Comple