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Propagation characteristics of pressure disturbances originated by gas jets in fluidized beds |
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| Authors: | D. Musmarra S. Vaccaro M. Fillai L. Massimilla |
| Affiliation: | a Dipartimento di Ingegneria Chimica, Università di Napoli “Federico II” e Istituto di Ricerche sulla Combustione, CNR, P. le V. Tecchio, 80125, Napoli, Italy b Dipartimento di Chimica, Università, via Mezzocannone 4, 80134, Napoli, Italy c Instituto di Chimica Industriale, Università, via Marzolo 9, 35131, Padova, Italy |
| Abstract: | An experimental investigation has been carried out on velocities and amplitudes of pressure disturbances in fluidized beds made of 100–200 μm glass ballotini. Disturbances were originated by gas jetting in a 0.35 m i.d. fluidized bed. A fluidization tube 0.10 m i.d. has also been used. Different types of disturbances have been induced in the bed contained in this tube: injection of a freely rising bubble and of a captive bubble; injection of a bubble chain; and compression of the bed free surface. The dynamic wave character of the disturbances has been shown. Velocities and amplitudes of waves moving through the beds have been measured. In particular, wave velocities have been compared with theoretical results obtained by the application of “pseudo-homogeneous” and “separated phase flow” models. |
| Keywords: | fluidization gas jets pressure fluctuations dynamic waves |
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