Slip-stick excitation and travelling waves excite silo honking


Type
Conference Object
Change log
Authors
Warburton, Katarzyna  ORCID logo  https://orcid.org/0000-0002-5537-0557
Porte, E 
Abstract

© The Authors, published by EDP Sciences, 2017. Silo honking is the harmonic sound generated by the discharge of a silo filled with a granular material. In industrial storage silos, the acoustic emission during discharge of PET-particles forms a nuisance for the environment and may ultimately result in structural failure. This work investigates the phenomenon experimentally using a laboratory-scale silo, and successfully correlates the frequency of the emitted sound with the periodicity of the mechanical motion of the grains. The key driver is the slip-stick interaction between the wall and the particles, characterized as a wave moving upwards through the silo. A quantitative correlation is established for the first time between the frequency of the sound, measured with an electret microphone, and the slip-frequency, measured with a high-speed camera. In the lower regions of the tube, both the slip-stick motion and the honking sound disappear.

Description
Keywords
5107 Particle and High Energy Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Journal Title
EPJ Web of Conferences
Conference Name
Powders and Grains 2017
Journal ISSN
2101-6275
2100-014X
Volume Title
140
Publisher
EDP Sciences
Sponsorship
Royal Society, IMA summer internship fund