Startseite Reinterpretation of the Geldart A powder classification based on Eulerian–Eulerian CFD simulation
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Reinterpretation of the Geldart A powder classification based on Eulerian–Eulerian CFD simulation

  • Janani Kannan und Priya C. Sande ORCID logo EMAIL logo
Veröffentlicht/Copyright: 18. Juli 2022
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International Journal of Chemical Reactor Engineering
Aus der Zeitschrift International Journal of Chemical Reactor Engineering Band 21 Heft 2

Abstract

Geldart classified powders into four categories and assigned each category its own unique characteristic. Geldart A particles, being easily aeratable, show a unique feature of ‘Homogenous expansion’ before bubbling. In this work, an additional feature for the Geldart chart is proposed which adds significant utility for the processing of Geldart A particles. CFD was used to characterize the entire Geldart A region of the Geldart chart based on detailed fluidization behavior. For this, Eulerian–Eulerian Two-fluid model (TFM) simulations were conducted for 25 particle systems across the entire span of the Geldart A region. The simulations (Solid volume fraction (SVF) contours) of bed evolution, taken before the appearance of multiple bubbles, were analyzed in detail. The particle systems were then sub-categorized into Red (5% average bed expansion), Orange (12.5% average bed expansion), and Green (30% average bed expansion) sub-types. The sub-types were plotted on Geldart chart, and for the first time a continuum heat map was generated, from which the ‘level of fluidizability’ of all Geldart A powders can be conveniently gaged. The map can be used for a more informed choice of powder for various industrial applications. Also, the A/B boundary proposed by Verloop was found to be a better fit for our proposed continuum when compared to the original Geldart A/B boundary. The 2D Simulation results performed in this work, found adequate validation against experimental findings in literature. Further, fine mesh 2D simulation results compared well with 3D simulations for dense bed, and were thereby deemed adequate for revealing dense bed behavior before onset of multiple bubbles.

Keywords: CFD simulation; Eulerian–Eulerian two-fluid model; gas–solid fluidization; Geldart A powder; homogenous fluidization
Corresponding author: Priya C. Sande, Department of Chemical Engineering, Birla Institute of Technology and Science (Pilani campus), Pilani 333031, Rajasthan, India, Phone: +91-01596-515812, E-mail:

Acknowledgments

We are grateful to Department of Chemical Engineering, Birla Institute of Technology and Science, Pilani, Pilani campus, for providing the computational facilities. We thank our department colleagues and Computer Lab staff for their support in completing this work.

  1. Author contributions: Both authors have accepted responsibility for the entire content of this submitted manuscript and have approved submission.

  2. Research funding: None.

  3. Conflict of interest statement: The authors declare no conflict of interest regarding this article.

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Supplementary Material

Tables S1–S4 in supporting information doc. provide the modeling equations used in this study including all the empirical models used as closures (Solids pressure, Drag law, stress tensor). The online version of this article offers supplementary material (https://doi.org/10.1515/ijcre-2022-0039).

Received: 2022-02-24
Accepted: 2022-07-02
Published Online: 2022-07-18

© 2022 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Articles
  3. Reinterpretation of the Geldart A powder classification based on Eulerian–Eulerian CFD simulation
  4. Evaluation of ion transport properties characterizing concentration polarization in membrane-solution system under different factors
  5. Effect of a new pattern of surface roughness on flow field and erosion rate of a cyclone
  6. The influence of central coke charging mode on the burden surface shape and distribution of a blast furnace
  7. CFD-based approach to design the heart-shaped micromixer with obstacles
  8. New insights into fluid mixing in micromixers with fractal wall structure
  9. Improved degradation of tetracycline antibiotic in electrochemical advanced oxidation processes (EAOPs): bioassay using bacteria and identification of intermediate compounds
  10. Numerical investigation on the laminar combustion characteristics of primary reference fuel: the effects of elevated temperatures and pressures
  11. Analysis and optimization of feed liquid flow characteristics of distributor in scraping film molecular distillation equipment
https://doi.org/10.1515/ijcre-2022-0039
Schlagwörter für diesen Artikel
CFD simulation; Eulerian–Eulerian two-fluid model; gas–solid fluidization; Geldart A powder; homogenous fluidization

Artikel in diesem Heft

  1. Frontmatter
  2. Articles
  3. Reinterpretation of the Geldart A powder classification based on Eulerian–Eulerian CFD simulation
  4. Evaluation of ion transport properties characterizing concentration polarization in membrane-solution system under different factors
  5. Effect of a new pattern of surface roughness on flow field and erosion rate of a cyclone
  6. The influence of central coke charging mode on the burden surface shape and distribution of a blast furnace
  7. CFD-based approach to design the heart-shaped micromixer with obstacles
  8. New insights into fluid mixing in micromixers with fractal wall structure
  9. Improved degradation of tetracycline antibiotic in electrochemical advanced oxidation processes (EAOPs): bioassay using bacteria and identification of intermediate compounds
  10. Numerical investigation on the laminar combustion characteristics of primary reference fuel: the effects of elevated temperatures and pressures
  11. Analysis and optimization of feed liquid flow characteristics of distributor in scraping film molecular distillation equipment
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