Druitt, TH;
Bruni, G;
Lettieri, P;
Yates, JG;
(2004)
The fluidization behaviour of ignimbrite at high temperature and with mechanical agitation.
Geophysical Research Letters
, 31
(2)
, Article L02604. 10.1029/2003GL018593.
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Abstract
Experiments were carried out to study the fluidization behaviour of ignimbrite at high temperature and while being mechanically agitated. Geldart group C behaviour occurs up to 565 degreesC when the material is subjected to increasing gas flow ( without agitation) from the loosely packed state. In contrast, even gentle mechanical agitation inhibits channelling and results in group-A type behaviour with homogeneous (non-bubbling) expansions of up to 30 - 40%. Bed collapse tests exhibit group-C behaviour at room temperature, group-A behaviour at 200 - 565 degreesC, and transitional behaviour at 55 degreesC. Both elevated temperature and mechanical agitation greatly increase the fluidizability of ignimbrite. It is inferred that a combination of high temperature and shear during transport will promote Geldart group A behaviour in pyroclastic flows.
Type: | Article |
---|---|
Title: | The fluidization behaviour of ignimbrite at high temperature and with mechanical agitation |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1029/2003GL018593 |
Publisher version: | http://dx.doi.org/10.1029/2003GL018593 |
Language: | English |
Additional information: | Copyright 2004 by the American Geophysical Union |
Keywords: | Pyroclastic flows |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
URI: | https://discovery.ucl.ac.uk/id/eprint/54287 |
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