Abstract
Random packing of binary mixtures of spherical particles in viscous fluid is numerically investigated via CFD-DEM, where moderate size ratios (d/D) are specially considered. Results indicate that binary packing in fluid is much looser than that in the absence of fluid, and two distinct phenomena can be identified as the global packing density varies with the volume fraction of coarse particle (XD). For small size ratios, the global packing density first increases with increasing XD due to the occupation mechanism, and then it reaches the maximum value when XD ≈ 0.6, beyond which the global packing density decreases as XD increases further. However, for large size ratios, the global packing density always decreases with increasing XD. These phenomena are further discussed by using the local packing density determined by Voronoi tessellation, the mean and local coordination number, and radial distribution function, with which the particle arrangements within binary mixtures are well identified.
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Funding
This work is financially supported by China Baowu Low Carbon Metallurgical Innovation Foundation (No. 202114). National Natural Science Foundation of China (No. 52304346) The Natural Science Foundation of Chongqing (No. cstc2021jcyj-msxmX0028).
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H. Chen wrote the main manuscript text, Z. Zheng provided supervision and funding acquisition. All authors reviewed the manuscript.
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Chen, H., Zheng, Z. Binary Packing of Spherical Particles with Moderate Size Ratios in Viscous Fluid: A CFD-DEM Study. Braz J Phys 54, 110 (2024). https://doi.org/10.1007/s13538-024-01476-0
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DOI: https://doi.org/10.1007/s13538-024-01476-0