000013894 001__ 13894
000013894 005__ 20161115094004.0
000013894 04107 $$aeng
000013894 046__ $$k2016-08-21
000013894 100__ $$aLe Bars, Michael
000013894 24500 $$aFragmentation and exchanges during planetary core formation

000013894 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000013894 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000013894 506__ $$arestricted
000013894 520__ $$2eng$$aTelluric planet formation involved the settling of large amounts of liquid iron coming from impactors into an ambient viscous magma ocean. Planetary initial state was largely determined by diffusive exchanges of heat and elements during this iron rain. Current models often assume that the metal rapidly equilibrated as drops of single capillary size settling at the Stokes velocity. But the dynamics is more complex, and influenced by the large viscosity ratio between the metal and ambient fluid. We study this two-phase flow using a model experiment, where a balloon of heated liquid metal is popped at the top of a tank filled with viscous liquid. We explore the relevant planetary regimes, including the whole range of viscosity ratios. High-speed videos allow determining the statistics of drop sizes, shapes, and velocities. Measures of the temperature decrease during settling allow defining a global turbulent diffusion coefficient, confronted to current analytical models.

000013894 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013894 653__ $$a

000013894 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000013894 720__ $$aLe Bars, Michael
000013894 8560_ $$ffischerc@itam.cas.cz
000013894 8564_ $$s153661$$uhttps://invenio.itam.cas.cz/record/13894/files/PO.FM06-1.23.107.pdf$$yOriginal version of the author's contribution as presented on CD, XMLout( page 876, code PO.FM06-1.23.107).
000013894 962__ $$r13812
000013894 980__ $$aPAPER