Effects of main particle diameter on improving particle flowability for compressed packing fraction in a smaller particle admixing system

Mikio Yoshida, Atsushi Misumi, Jun Oshitani, Kuniaki Gotoh, Atsuko Shimosaka, Yoshiyuki Shirakawa

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7 Citations (Scopus)


Particle flowability can be improved by admixing particles smaller than the original particles (main particles). However, the mechanisms by which this technique improves flowability are not yet fully understood. In this study, we examined compressed packing in a particle bed, which is affected by particle flowability. To estimate the mechanism of improvement, we investigated the effects of the main particle diameter on the improvement of compressed packing fractions experimentally.The main particles were 397 and 1460. nm in diameter and the admixed particles were 8, 21, 62, and 104. nm in diameter. The main and admixed particles were mixed in various mass ratios, and the compressed packing fractions of the mixtures were measured. SEM images were used to analyze the coverage diameter and the surface coverage ratio of the admixed particles on the main particles. The main particle packing fraction was improved as the diameter ratio (=main particles/admixed particles) increased. This was explained by a linked rigid-3-bodies model with leverage. Furthermore, the actual surface coverage ratio at which the most improved packing fraction was obtained decreased with increasing main particle diameter. This was explained by the difference in the curvature of the main particle surface.

Original languageEnglish
JournalAdvanced Powder Technology
Publication statusAccepted/In press - 2017



  • Admixture of nanoparticles
  • Compressed particle bed
  • Packing fraction
  • Particle diameter ratio

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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