The dynamics of a fully fluidized bed of group C powders subject to vertical vibration was studied in a 85 mm ID transparent perspex column. Acceleration level was set to a/g = 2. Frequency was varied in the range between 10 and 60 Hz. Two bed mass values corresponding to two different bed heights were tested. Time series of the position of the oscillating column wall and those of the oscillating bed height were obtained by means of particle image velocimetry applied to sequences of digitised images of the bed taken with the help of a high speed video camera. These time series were compared (Fig. 1) with a theoretical model which assumes the bed as a linear elastic continuum subject to viscous or frictional damping.
Dynamic response of a vibrated fluidized bed of a cohesive potato starch powder
BARLETTA, Diego;RUSSO, Paola;POLETTO, Massimo
2010-01-01
Abstract
The dynamics of a fully fluidized bed of group C powders subject to vertical vibration was studied in a 85 mm ID transparent perspex column. Acceleration level was set to a/g = 2. Frequency was varied in the range between 10 and 60 Hz. Two bed mass values corresponding to two different bed heights were tested. Time series of the position of the oscillating column wall and those of the oscillating bed height were obtained by means of particle image velocimetry applied to sequences of digitised images of the bed taken with the help of a high speed video camera. These time series were compared (Fig. 1) with a theoretical model which assumes the bed as a linear elastic continuum subject to viscous or frictional damping.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
