INVESTIGADORES
SCHVEZOV Carlos Enrique
congresos y reuniones científicas
Título:
Numerical modeling of interaction of particles with solidifying crystals.
Autor/es:
ROSENBERGER M.R., AGALIOTIS E.M.,; SCHVEZOV C.E
Lugar:
Florencia, Italia.
Reunión:
Congreso; XX Congress of the International Union of Crystallography; 2005
Institución organizadora:
IUCr
Resumen:
The thermal fields for the movement of a solidification interface
towards a spherical particle was dynamically modeled for studying the
deformation of the interface in relation with different thermal
properties of the particle with the matrix solid-liquid. Finite element
methods were employed in an axi-symmetric model of the system.
Both particle and matrix were considered of similar densities and heat
capacity. The convective force in the liquid phase was not considered.
The results show that a concave interface is found when the particle
has a larger thermal conductivity than the matrix, and a convex
interface is found in the opposite case.
In addition, the drag force on a particle being pushed by a crystal
was calculated with a fluid flow model. The force was calculated for
different pushing configurations and the results compared with the
values given by the modified Stokes equation [1]; which show that the
model value are slightly larger than those the calculated with the
equation. This difference predict an equilibrium separation for
pushing lower than the computed by modified Stokes expression when
a Lifshitz-Van der Waals model for the repulsion force [2] is used.
[1] Uhlmann M.A., Chalmers B., Jackson K.A. J. Appl. Phys., 1964, 35, 2986.
[2] DzyaloshinskiiJ. Appl. Phys., 1964, 35, 2986.
[2] Dzyaloshinskii