Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3102604d&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 2, CiteID L02604
Physics
4
Planetary Sciences: Volcanism (8450), Volcanology: Eruption Mechanisms, Volcanology: Ash Deposits, Volcanology: General Or Miscellaneous
Scientific paper
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°C 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°C, and transitional behaviour at 55°C. 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.
Bruni Gabriele
Druitt T. H.
Lettieri P.
Yates George J.
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