Mathematics – Logic
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999e%26psl.166...71l&link_type=abstract
Earth and Planetary Science Letters, Volume 166, Issue 1-2, p. 71-84.
Mathematics
Logic
16
Scientific paper
The physical effects of air or argon bubbles on the rheology of a calcium aluminosilicate melt have been measured at temperatures ranging from 830° to 960°C, at 1 bar pressure. The melt composition is SiO2:64, Al2O3:23, and CaO:13 (wt%), while bubble volume fractions are: 0, 0.06, 0.13, 0.32, 0.41 and 0.47. Measured Newtonian viscosities range from 1010 to 1014 dPa s. Melts with bubble fractions of 0.06 and 0.13 show with increasing temperature /(T) an increasing relative viscosity for /T < 850°C. However at /T > 850°C, for all bubble fractions the viscosity decreases markedly with temperature. The observed maximum decrease of the relative viscosity is 75% for a bubble fraction of 0.47 at 907°C. At all bubble fractions the viscosity is independent of the applied stress, which ranged from 11 to 677 bars. No clear indications were observed of non-Newtonian rheological behavior. Under our experimental conditions the relative viscosity of the two phase liquid depends primarily on the bubble fraction. Physical and volcanological implications of these measurements are discussed.
Bottinga Yan
LeJeune Anne-Marie
Richet Pascal
Trull Thomas W.
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