HR: 16:15h
AN: V14A-03    [Abstracts]
TI: Experimental Investigation of Water-Magma Mingling
AU: * Friedman, P D
EM: pfriedman@umassd.edu
AF: University of Massachusetts Dartmough, Department of Mechanical Engineering 285 Old Westport Road, Dartmouth, MA 02747
AB: Experimental laboratory simulations are investigating the hydrodynamics of submerged volcano under varying flow conditions and vent geometries to answer questions about phase mingling that precedes phreatomagmatic explosions. Experiments concentrate on understanding the flow structure in the absence of heat transfer, a reasonable initial assumption under film boiling conditions. General flow patterns indicate that the overall flow structure is predominantly a function of a vent Richardson number. Phase mingling is a function of Richardson number Reynolds number, viscosity ratio and Morton number (dimensionless surface tension). Particular emphasis is placed on determining threshold flow conditions under which phase mingling occurs and mingling characteristics including volume fraction and diameter. Phase mingling is correlated to the flow structure by simultaneously capturing particle image velocimetry (PIV) and laser induced fluorescence (LIF) images and superposing them with a beam splitter. LIF images identify phase boundaries while PIV images map flow velocity field.
DE: 8424 Hydrothermal systems (8135)
DE: 8429 Lava rheology and morphology
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2005 Joint Assembly