HR: 0830h
AN: V51E-0318    [PDF]
TI: Bubble size distributions in a convecting layer
AU: * Namiki, A
EM: namiki@eps.berkeley.edu
AF: University of California, Berkeley, Department of Earth & Planetary Science 307 McCone Hall, Berkeley, CA 94720-4767 United States
AU: * Namiki, A
EM: namiki@eps.berkeley.edu
AF: Kanazawa University, Department of Earth Sciences, Kakuma, Kanazawa, 920-1192 Japan
AU: Hatakeyama, T
EM: hatake@center.ous.ac.jp
AF: Okayama University of Science, Information Processing Center, 1-1, Ridai-cho, Okayama, 700-0005 Japan
AU: Toramaru, A
EM: toratora@kenroku.kanazawa-u.ac.jp
AF: Kanazawa University, Department of Earth Sciences, Kakuma, Kanazawa, 920-1192 Japan
AU: Kurita, K
EM: kurikuri@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, 1-1-1, Yayoi, Bunkyo, Tokyo, 113-0032 Japan
AU: Sumita, I
EM: sumita@hakusan.s.kanazawa-u.ac.jp
AF: Kanazawa University, Department of Earth Sciences, Kakuma, Kanazawa, 920-1192 Japan
AB: We have conducted a series of laboratory experiments to explore the bubble size distribution coupled with convection in a magma chamber. Boiling liquid heated from below exhibits two types of convection pattern depending on the viscosity. When the viscosity is sufficiently high, bubbles are distributed uniformly in the liquid, and the bubble size distribution becomes the power law type for large bubbles and exponential distribution for small bubbles. On the other hand, when the viscosity is low, bubbles are separated from the liquid layer, making a foam, and their size distribution is exponential for large bubbles and unimodal for small bubbles. These experimental results suggest that the bubble size distribution is determined whether the viscous drag of the magma is sufficiently high to trap bubbles.
DE: 3220 Nonlinear dynamics
DE: 8429 Lava rheology and morphology
DE: 8439 Physics and chemistry of magma bodies
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting