MicroCT imaging to determine coordination number and contact area of biomass particles in densified assemblies

Karamchandani, Apoorva; Yi, Hojae; Puri, Virendra M.

doi:10.1016/j.powtec.2019.06.002

Cited by 5 publications

(3 citation statements)

References 47 publications

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“…Some authors also published that the particles' shape and size distribution strongly influence the coordination number (Alonso et al 1997;Wetter et al 2018). Karamchandani et al (Karamchandani et al 2019) state for widely distributed particle sizes that a stable structure formation starts with a coordination number equal to 8, whereby the theoretical upper value 14 serves for a thoroughly compacted bulk material, which was also proved by other authors (German 2014;German et al 2009;Bjørk et al 2012). It is also possible to obtain higher coordination numbers than 14 for particles with different dimensions and shapes (Kristiansen et al 2005).…”

Section: Ah Cake mentioning

confidence: 81%

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Neighborhood Relationships of Widely Distributed and Irregularly Shaped Particles in Partially Dewatered Filter Cakes

2021

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A more thorough understanding of the properties of bulk material structures in solid–liquid separation processes is essential to understand better and optimize industrially established processes, such as cake filtration, whose process outcome is mainly dependent on the properties of the bulk material structure. Here, changes of bulk properties like porosity and permeability can originate from local variations in particle size, especially for non-spherical particles. In this study, we mix self-similar fractions of crushed, irregularly shaped Al2O3 particles (20 to 90 µm and 55 to 300 µm) to bimodal distributions. These mixtures vary in volume fraction of fines (0, 20, 30, 40, 50, 60 and 100 vol.%). The self-similarity of both systems serves the improved parameter correlation in the case of multimodal distributed particle systems. We use nondestructive 3D X-ray microscopy to capture the filter cake microstructure directly after mechanical dewatering, whereby we give particular attention to packing structure and particle–particle relationships (porosity, coordination number, particle size and corresponding hydraulic isolated liquid areas). Our results reveal widely varying distributions of local porosity and particle contact points. An average coordination number (here 5.84 to 6.04) is no longer a sufficient measure to describe the significant bulk porosity variation (in our case, 40 and 49%). Therefore, the explanation of the correlation is provided on a discrete particle level. While individual particles < 90 µm had only two or three contacts, others > 100 µm took up to 25. Due to this higher local coordination number, the liquid load of corresponding particles (liquid volume/particle volume) after mechanical dewatering increases from 0.48 to 1.47.

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Section: Ah Cake mentioning

confidence: 81%

“…Particle-particle relationships provide information about bulk structures resulting in stable particle arrangements (Karamchandani et al 2019). Microscopically, the coordination number as a measure for particle contacts depends on the packing density, represented by the corresponding porosity, and the shape and size of the neighbors.…”

Section: Introductionmentioning

confidence: 99%