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Tribo-charging of binary mixtures composed of coarse and fine particles in gas–solid pipe flow

Wang, H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.partic.2018.07.001
  3. Publisher: Elsevier B.V , 2019
  4. Abstract:
  5. Experiments were conducted to investigate the effect of adding fines on the tribo-charging of coarse glass beads. Four types of fines, i.e., copper, stainless steel, uncoated and silver-coated fine glass beads, mixed with 240–830 μm glass beads were conveyed by air through a stainless-steel spiral pipe acting as a tribo-charger. Regardless of the type or electrical conductivity of the fine particles tested, adding small amounts of fines (up to 10 wt%) to coarse glass beads resulted in a sharp increase in the mass and surface charge densities of the particles. In general, the profiles of the mass and surface charge densities of the fine–coarse particle mixtures as a function of the mixture composition were determined by the relative magnitude of contact potential differences and the total surface areas of all the components. The dominant particle tribo-electrification mechanism switched from coarse particle–wall contacts to fine particle–wall contacts when the fines weight percentage in the mixture exceeded 10%. A model was developed to predict the mass charge density of binary mixtures as a function of the mixture composition
  6. Keywords:
  7. Binary mixture ; Electrostatics ; Fine particles ; Gas–solid flow ; Tribo-charging ; Charge density ; Gases ; Glass ; Granular materials ; Stainless steel ; Contact potential difference ; Electrical conductivity ; Mixture compositions ; Total surface area ; Tribocharging ; Triboelectrification ; Weight percentages ; Binary mixtures
  8. Source: Particuology ; Volume 43 , 2019 , Pages 101-109 ; 16742001 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S1674200118301731