Oscillations and defect turbulence in a shallow fluidized bed
| dc.creator | Clark, D. K. | |
| dc.creator | Tsimring, L. S. | |
| dc.creator | Aranson, I. S. | |
| dc.date | 2000-05-06 | |
| dc.date.accessioned | 2026-07-07T05:32:49Z | |
| dc.date.available | 2026-07-07T05:32:49Z | |
| dc.description | We report an experimental study of the dynamics of an air-fluidized thin granular layer. Near-onset behavior of this shallow fluidized bed was described in the earlier paper (Tsimring et al, 1999). Above the threshold of fluidization the system exhibits a Hopf bifurcation as the layer starts to oscillate at a certain frequency due to a feedback between the layer dilation and the airflow drag force. After application of temporal band-pass filtering of this frequency we discovered the spatio-temporal dynamics in the form of defect turbulence. This type of dynamics is natural for spatio-temporal systems close to the threshold of a Hopf bifurcation. At high flow rates, low-frequency short-wavelength structures appear in addition to the long-wavelength excitations. A simple model describing the instability and occurrence of oscillations in a shallow fluidized bed, is proposed. | |
| dc.description | 4 pages, 5 figures, submitted to PRL | |
| dc.identifier | https://arxiv.org/abs/nlin/0005010 | |
| dc.identifier | http://arxiv.org/abs/nlin/0005010 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/79793 | |
| dc.subject | Pattern Formation and Solitons | |
| dc.title | Oscillations and defect turbulence in a shallow fluidized bed | |
| dc.type | text |