[Seminar] WIGNER SZFI Seminar, 23 Apr - Kiwing To

[Janos Asboth]

*WIGNER SZFI Seminar*
Granular Flow and Clog in Hoppers and Silos

*Kiwing To*
Institute of Physics, Academia Sinica, Taipei, Taiwan (host: Börzsönyi
Tamás)

Tuesday, 23 April 2019 10:00, KFKI Campus, Bldg. 1, 2nd floor, Conference
Room

In this talk, I shall give a brief introduction on gravity driven granular
flow through hoppers and silos. Phase transitions of flow on reducing the
size of the orifice of the hopper/silo will also be reviewed. When
monodisperse grains falling out of a cylindrical silo through a circular
exit at the bottom, no continuous flow can be sustained when the diameter D
of the exit is about 5 times that of the grains. If the exit of the silo
moves horizontally (e.g. circular motion or linear oscillation) with
respect to the wall of the silo, finite flow rate can be sustained even at
small exit diameter D. If the exit rotates at off-center distance R with
angular frequency Omega, the flow rate W increases with R*Omega. Similarly,
if the exit oscillates with amplitude A and oscillation frequency f, the
flow rate W increases with A*f. On the other hand, if the exit diameter D
is large, the flow rate W varies non-monotonically with either the angular
frequency Omega or oscillation frequency f. Since silos and hoppers are
very common appliances that are used as transporting or distributing
granular materials in food, coal and pharmaceutical industries, which
suffer high losses due to clogging, our work will not only enhance our
basic understanding of the phenomenon of clogging but also improve the
design of hoppers and silos for less clogging.



Everyone is welcome to attend.

János Asbóth
szfi-seminar at wigner.mta.hu
--------- következő rész ---------
Egy csatolt HTML állomány át lett konvertálva...
URL: <http://mail.szfki.hu/pipermail/seminar/attachments/20190418/2901c1f4/attachment.html>