Measurement of boundary force and wall friction coefficient during the development of a granular discharge flow from a symmetric silo. (19th May 2021)

• Record Type: Journal Article
• Authors: Jiang, Ming-Zhe; Tsai, Jih-Chiang; Yang, Fu-Ling
• Is Part Of: Journal of the Chinese Institute of Engineers. Volume 44:Number 4(2021)
• Page Start: 368
• Page End: 378
• Publication Date: 2021-05-19
• Subjects: Boundary force measurement -- wall friction coefficient -- silo discharge; Technology -- Periodicals; Engineering -- Periodicals; 620.005
• DOI: 10.1080/02533839.2021.1897687
• Languages: English
• ISSNs: 0253-3839

Abstract

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.