Effects of the drag force on the rise height of particles in the gas-thrust region of volcanic eruption columns

Details Effects of the drag force on the rise height of particles in the gas-thrust region of volcanic eruption columns Effects of the drag force on the rise height of particles in the gas-thrust region of volcanic eruption columns

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..441b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, May 1989, p. 441-444. Research supported by NATO.

Physics

3

Drag, Particle Motion, Two Phase Flow, Vertical Motion, Volcanoes, Jet Flow, Particle Density (Concentration), Particle Size Distribution

Scientific paper

The effects of the drag force on the rise height of particles in two-phase nonbuoyant jets are evaluated and applied to the study of the dynamics of the gas-thrust region of volcanic eruption columns. Drag effects are shown to modify the eruption column collapse and pyroclastic flow formation caused by gradual changes in initial particle concentration or gas content. It is suggested that these effects may account for column height fluctuation during collapes and some of the bedding characteristics of coignimbrite lag breccias.

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