Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/943
AuthorsSalatino, P. 
TitleAssessment of motion-induced fluidization of dense pyroclastic gravity currents
Issue Date2005
Series/Report no.48 (4-5)
URIhttp://hdl.handle.net/2122/943
Keywordspyroclastic flow
fluidization
gravity current
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
AbstractThe paper addresses some fundamental aspects of the dynamics of dense granular flows down inclines relevant to pyroclastic density currents. A simple mechanistic framework is presented to analyze the dynamics of the frontal zone, with a focus on the establishment of conditions that promote air entrainment at the head of the current and motion-induced self-fluidization of the flow. The one-dimensional momentum balance on the current along the incline is considered under the hypothesis of strongly turbulent flow and pseudo-homogeneous behaviour of the two-phase gas-solid flow. Departures from one-dimensional flow in the frontal region are also analyzed and provide the key to the assessment of air cross-flow and fluidization of the solids in the head of the current. The conditions for the establishment of steady motion of pyroclastic flows down an incline, in either the fluidized or «dry» granular states, are examined.
Appears in Collections:Annals of Geophysics

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