Physical properties and X-ray tomography images of five different granular materials: glass bead, glass grit, short grain white rice, sorghum and clay granules (Seramis) are investigated to select the most promising materials for numerical simulations and time-lapse X-ray tomography imaging. The examined materials represent granular materials of non-biological origin (glass bead, glass grit and Seramis) and granular plant materials (rice and sorghum). The choice of materials was dictated by their mechanical and packing properties, on one hand, and 3D imaging qualities of granular materials and quantitative particle shape analysis, on the other hand. It was found that materials of biological origin, i.e. rice and sorghum, showed promising characteristics and may be considered as the most appropriate materials for comparison between time-lapse X-ray tomography experiments and numerical simulation.

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Selection of material for X-ray tomography analysis and DEM simulations: comparison between granular materials of biological and non-biological origins

This paper addresses the issues of monitoring and diagnostics of flow processes in gravitational flows of friable materials within large-scale silos The author shows how the electrical capacitance tomography (ECT) may be used for monitoring large-scale industrial reactors dedicated for dense granular flow The ECT sensors under investigation are specially designed for large-scale measurements and accompanied by a dedicated measurement protocol The proposed ECT sensor allows visualizing, in form of 3-D image, material concentration distribution inside silo wall area for 15 m silo container The developed method provides possibility of analyze effective transition point, boundary between stagnant zone and flowing material

Visualization System for Large-Scale Silo Flow Monitoring Based on ECT Technique

Investigation of the effective elastic parameters in the discrete element model of granular material by the triaxial compression test

When considering the operation of roller presses for the consolidation of fine-grained materials, the main problems are disturbances in the proper flow of the material and its bridging in gravity feeders. This is especially true for small and medium capacity presses, where the hoppers for dosing the material are narrow. This article presents innovative laboratory tests of the impact of using a polymer plate lining in the gravity feeder of a roller press. Polymer materials Polyacetal C (POM C) and Ultra-High-Molecular-Weight Polyethylene (UHMW-PE) were used for the tests. The influence of the use of plates on the material flow and quality of briquettes was investigated in comparison with the case where such plates were not used. The research showed an improvement in the flow of fine-grained materials in the feeder and an increase of the briquette strength indexes, as compared to those cases when polymer linings were not used in the feeder.

https://www.mdpi.com/2073-4360/12/11/2489/pdf

The Influence of the Use of Polymer Lining within the Roller Press Gravity Feeder on Briquette Quality.

Experimental, continuum- and DEM-based velocities in a flat-bottomed bin

1 IPPT Reports on Fundamental Technological Research 1/2013 Irena Sielamowicz, Robertas Balevičius EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF GRANULAR MATERIAL FLOW IN MODEL SILOS Institute of Fundamental Technological Research Polish Academy of Sciences Warsaw 2013

I. Sielamowicz

Papers

Experimental and computational analysis of granular material flow in model silos