Turbulent diffusion in particulately fluidized beds of particles

✍ Scribed by Thomas J. Hanratty; George Latinen; Richard H. Wilhelm

• Publisher: American Institute of Chemical Engineers
• Year: 1956
• Tongue: English
• Weight: 897 KB
• Volume: 2
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690020316

✦ Synopsis

Measuring the spreading of a tracer dye from a point source yields information on diffusion in glass-sphere beds fluidized in water. Particulately fluidized beds, which are here formed, are well described by the statistical turbulence equations of Taylor. Miring parameters-eddy diflusivity, scale, and intensity of turbulence-are established. Transition of these variables is traced from fixed beds through fluidized beds in different degrees of bed expansion.

Mixing characteristics of these "ideal" types of fluidization may provide a frame of reference for consideration of more complex systems. *In the preaent work diffusion measurements were performed only in two dimensions and generally under such conditions that diflusion in the third dimemion may be neglectod. Present work hss therefore been proved to be isotropic in two dimensions. Iaotro y in three dimensious is aseumed in the present &velopment.