Direct measurement of the effect of adhesion on powder flow behavior: Experimental and DEM investigations

K. Bose, R. Moreno, S. J. Antony, Y. Ding, S. R. Biggs, M. Ghadiri, D. Rhodes, A. Milliken

Research output: Chapter in Book/Conference paperConference paper

7 Citations (Scopus)

Abstract

The current study adapts a novel approach to directly measure the effect of particle adhesion on the bulk powder flow characteristics. This is achieved by modifying the adhesion of spherical glass particles (mean size: 38 μm) through a protocol that involves the deposition of surface silane monolayers on individual glass particles. The increase in particle surface energy has been characterized by particle-particle pull off force measurements using Atomic Force Microscopy. An annular shear cell has been used to measure flow properties and to quantify the effect of surface energy of the silanized glass particles on their bulk cohesion. Computer simulations using the Distinct Element Method (DEM) have also been carried out. The DEM simulations use JKR adhesion model to incorporate the surface energy values of glass beads corresponding to the AFM pull-off force measurements. The Unconfined Yield Stress (UYS) and Flow Factor (ff) obtained by the simulations have been compared with the experiments.

Original languageEnglish
Title of host publicationPowders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media
Pages555-558
Number of pages4
Volume1
Publication statusPublished - 1 Dec 2005
Externally publishedYes
Event5th International Conference on the Micromechanics of Granular Media: Powders and Grains 2005 - Stuttgart, Germany
Duration: 18 Jul 200522 Jul 2005

Conference

Conference5th International Conference on the Micromechanics of Granular Media: Powders and Grains 2005
CountryGermany
CityStuttgart
Period18/07/0522/07/05

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