[Fluidos] seminario, martes 26, iim

[Roberto Zenit <zenit@servidor.unam.mx>]

Por considerarlo de interÃs general...

Saludos
Roberto


SEMINARIO
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


ImpartirÃ:
Dr. Angel RuÃz Angulo
Lamont Doherty Earth Observatory
Columbia University


Resumen
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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