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Rheological Features of the 1971 Mount Etna Lavas

B. Booth and S. Self
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 274, No. 1238, Mount Etna and the 1971 Eruption (Feb. 15, 1973), pp. 99-106
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/74334
Page Count: 8
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Rheological Features of the 1971 Mount Etna Lavas
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Abstract

Rheological studies on the 1971 Mount Etna lavas indicate they underwent rapid transition from Newtonian to non-Newtonian fluids near their point of emission and that the non-Newtonian regime may be coincidental with high mechanical energy/low heat energy regime further from the boccas. Darcy's equation quantifies the surface roughness of channels using the Chezy coefficient and is plotted against Reynolds number on a Stanton diagram. The relation is linear, and the critical value Rec is not exceeded, proving wholly laminar flow. The lava underwent a divergent, twin spiral motion involving two dimensional laminar flow. Convergent, twin spiral motion occurred only where lava passed through a constriction at a relatively high velocity.

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