[1] We performed laboratory experiments of RayleighTaylor instability of superposed viscous fluids where the upper layer contains denser spherical solid particles. A series of experiments are made by varying the viscosity and the particle diameter, and we measure the growth rate and the wave length of the instability. The instability consists of fine-scaled plumes, which coalesce as they descend. Plumes are observed to form intermittently and the particle layer thins with time, which finally descend as blobs. We find that the growth rate can be explained by using the linear stability analysis for Rayleigh-Taylor instability of viscous fluids, by taking the effective viscosity of particle bed to be 20 times that of the fluid, and scale the thickness of the upper layer by twice the particle diameter. Using this scaling, we find that a partially solidified layer beneath the surface of a lava lake may become unstable by this mechanism.Citation: Michioka, H., and I. Sumita (2005), Rayleigh-Taylor instability of a particle packed viscous fluid: Implications for a solidifying magma, Geophys. Res. Lett., 32, L03309,
e z ẑ Y T ] Te d | W S & z ] T_ | X `fX | d g yX d Ø x f â } 304 * 2014.7.23 受付 ** 金沢大学大学院 自然科学研究科 自然システム学専攻 地球環境学コース 〒920-1192 石川県 金沢市 角間町 TEL.
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