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[Fluidos] seminario, martes 26, iim
Por considerarlo de interÃs general...
El Instituto de Investigaciones en Materiales
invita al Seminario:
âSurface Deformation in a Liquid Enviroment Resulting from Single
Particle Collisions, and my story from the bottom of the Oceanâ
Dr. Angel RuÃz Angulo
Lamont Doherty Earth Observatory
Multiphase flows are fairly complex and they are usually studied as a
bulk. The way we approach this problem is by looking at single particle
interactions (particle-particle and particle-wall). This thesis presents
experimental measurements of the approach and re-bound of a particle
colliding with a "deformable" surface in a viscous liquid. The complex
interaction between the fluid and the solid phases is coupled through
the dynamics of the flow as well as the deformation process. Steel
particles were used to impact different aluminum alloy samples (Alï
6061, Alï2024, and Alï7075) using different aqueous mixtures of
glycerol and water as a viscous fluid. Normal coefficient of restitution
and deformation parameters account for losses due to lubrication effect
and inelasticity, identifying then, the dominant energy loss mechanism
during the collision process. The experiments clearly show four
different regimes depending on the impact Stokes number: lubrication
effect and elastic deformation, lubrication effect and elastic-plastic
deformation, elastic deformation with no hydrodynamic effects, and
merely elastic-plastic deformation with negligible lubrication effect.
An analysis of the erosion of ductile materials during immersed
collisions is presented. The size of the crater formed by the impact of
a single particle against a ductile target can be estimated from theory,
and these estimates agree well with experimental measurements.
Martes 26 de mayo, 12:30 hrs. en la Sala de Conferencias del IIM.
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