INVESTIGADORES
IPPOLITO Irene Paula
congresos y reuniones científicas
Título:
Mixing Grains using flux through a Galton Board
Autor/es:
BENITO, JESICA G., VIDALES ANA M., IPPOLITO IRENE
Lugar:
Mendoza
Reunión:
Congreso; FLUIDOS-2006 IX Reunión sobre Recientes Avances en Fisica de Fluidos y sus Aplicaciones; 2006
Resumen:
We present an experimental and numerical study concerning the problem of the passage of small particles of
different species through a Galton Board, i.e., a two dimensional array of equally spaced obstacles arranged
to form a triangular lattice. The aim of the present paper is to characterize the mixture of particles at the
exit as a function of the separation between the lateral walls of the board.
To perform experiments, the board is placed vertically and small disks of two different species
are launched from above. The relative separation between lateral walls can be varied as wanted.
Disks fall down because of gravity effects, colliding successively with obstacles and, eventually,
with lateral walls. When they finally get the exit at the bottom of the board, they are collected in
separate boxes, depending on their final horizontal positions. Separation between walls is varied and
the exit distribution of particles and their degree of mixture are calculated as a function of separation.
Simulations are performed in a similar way, trying to follow the main features of experiments. Only geometrical
aspects are consider and no dynamic calculations are used.
We found that there exists a crossover from a Gaussian-like to a uniform-like behaviour
when the separation between walls is less than a critical value. This is a crucial point to
consider in mixing particles. A systematic study of this crossover is performed through numerical
simulations and the results are also approximated by a theoretical model of the problem. A criterion
to mix particles with this procedure is established and conclusions for applications are drawn.