Solids mixing in fluidized beds—a hydrodynamic approach

✍ Scribed by Yueh Liu; Dimitri Gidaspow

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 707 KB
• Volume: 36
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(81)80143-1

✦ Synopsis

Ah&act

-Solids mixing in fluidized beds has traditionally been treated using empirical transfer or diffusion coefficients. This study presents a new approach. A hyperbolic diiusion equation is derived by linearizing two phase flow equations of motion obtained previously by minimizing the rate of entropy production. Analytical solutions to the hyperbolic diiusion equation for a tracer concentration are obtained using Laplace transforms and the method of images. The solutions comuare well with solids mixint exoeriments. The solutions involve a propagation velocity, which is determined by two phase mass balances, a&a difiusion coefficient which is a ratio of kinetic energy to interphase friction or drag, as in Einstein's diffusion coefficient. Least square curve fits of data to the theory produced reasonable values of the drag coefficients.

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