Measurement of boundary force and wall friction coefficient during the development of a granular discharge flow from a symmetric silo
Journal
Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A
Journal Volume
44
Journal Issue
4
Pages
368-378
Date Issued
2021
Author(s)
Abstract
Self-developed sensing modules were implemented in a symmetric silo of flat base to study the spatial-temporal evolution of the normal and tangential boundary force from the onset of a granular discharge. The static force profiles can be reproduced by Janssen’s model but peculiar variation into non-Janssen force depth profiles was detected after the onset of discharge. Interestingly, the two force components evolved in a consistent manner at steady discharge to yield a narrow range of the effective wall friction coefficient μ w. As for the transient phase before the steady discharge, different transient evolution trends were discovered for μw (t) to a value much greater than the value at steady discharge and the type of μw (t) evolution is closely tied with the initial static force state. ? 2021 The Chinese Institute of Engineers.
Subjects
Friction; Discharge flow; Force component; S models; Spatial-temporal evolution; Static forces; Transient evolution; Transient phase; Wall friction; Walls (structural partitions)
Type
journal article