HR: 0800h
AN: T41C-1313    [Abstracts]
TI: The Role of Grain Boundary Wetting in Two-phase Flow
AU: * Hier-Majumder, S
EM: saswata.hier-majumder@yale.edu
AF: Yale University, Department of Geology and Geophysics, 210 Whitney Avenue, New Haven, CT 06511 United States
AU: Ricard, Y
EM: ricard@ens-lyon.fr
AF: Ecole Normale Superieure de Lyon, 46, Allée d'Italie 69364 LYON Cedex 07, Lyon, 69364 France
AU: Bercovici, D
EM: david.bercovici@yale.edu
AF: Yale University, Department of Geology and Geophysics, 210 Whitney Avenue, New Haven, CT 06511 United States
AB: We employ the theory of two-phase flow to investigate the influence of grain boundary wetting during segregation of magma in a partially molten aggregate. In partially molten aggregates the `disaggregation melt fraction', the volume fraction of partial melt at which grain boundaries are completely wetted, is crucial in determining the total interfacial force per unit volume. Surface tension on grain boundaries in melt fractions less than the disaggregation melt fraction tend to homogenize melt distribution when the solid-liquid interfacial tension is smaller than the interfacial tension arising from grain boundaries. We also demonstrate that in the presence of large grain-grain interfacial tension, the solitary wave solution to the mass, energy, and momentum equations for two-phase aggregates becomes dissipative. Under such conditions, the rate of buoyancy driven melt segregation is reduced due to melt retention by grain boundaries.
DE: 1037 Magma genesis and partial melting (3619)
DE: 3285 Wave propagation (0689, 2487, 4275, 4455, 6934)
DE: 8434 Magma migration and fragmentation
SC: Tectonophysics [T]
MN: Fall Meeting 2005