Authors: J S Leszczynski T Blaszczyk
Publish Date: 2010/12/25
Volume: 13, Issue: 4, Pages: 429-438
Abstract
In this paper we have examined the stable and unstable states of the operation during the emptying of the silo Here the state of stable operation of the silo is understood as a smooth mass outflow The unstable state is manifested by funnel flow or arching This issues from a moistured granular material We have focused on the two extreme experimental cases The first option was considered as a mass flow and the second one was considered as arching Based on experimental data we have simulated the silo emptying by DEM Considering the transition between stable and unstable operation we proposed a novel mathematical model of the silo emptying This model involves a fractionaldifferential oscillator equation Analyzing the solution of this equation we have presented how to recognize the state of stable and unstable operation during silo emptyingWe would like to thank Prof Bogumil Wrana Mr Jan Pietras and Mr Bartlomiej Czado from Cracow University of Technology for their performace of shear tests and Dr Mariusz Ciesielski from Czestochowa University of Technology for his fruitful discussion and assistance in carrying out the simulation using DEMThis article is published under an open access license Please check the Copyright Information section for details of this license and what reuse is permitted If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and reuse information please contact the Rights and Permissions team
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