Non-Newtonian fluidization of spherical-particle beds

✍ Scribed by Ivan Machač; Petr Mikulášek; Iva Ulbrichová

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 886 KB
• Volume: 48
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(93)80086-6

✦ Synopsis

Fluidization of spherical-particle beds with viscoelastic shear thinning polymer solutions was experimentally investigated in creeping-and transient-flow regions. The results of measurements show that the course of bed expansion depends on the kind and degree of non-Newtonian anomaly, on the flow region, and on the apparatus wall effect. The limited bed expansion observed during fluidization in the creeping-flow region weakened with the increasing Reynolds number and vanished when a critical value of Reynolds number was exceeded. Empirical equations based on the Carreau viscosity model were suggested for the prediction of minimum fluidization velocity and for bed expansion in both creeping-and transientflow regions.