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Effects of boundary walls on the properties of settling spheres

  • Sadia Haider , Atta Ullah und Adnan Hamid ORCID logo EMAIL logo
Veröffentlicht/Copyright: 27. August 2021
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International Journal of Chemical Reactor Engineering
Aus der Zeitschrift International Journal of Chemical Reactor Engineering Band 20 Heft 4

Abstract

Numerical Simulations are performed, using Eulerian two fluid model (TFM) to investigate the effects of solid volume fraction and no-slip side walls on the settling particles. It is found that average settling velocity decreases with increasing volume fraction for both gas-solid (GS) and liquid-solid (LS) systems, in good agreement with the Richardson-Zaki 1 − ϕ n law. It was also noted that average velocity is independent of the boundary condition for both gas-solid (GS) and liquid-solid (LS) systems. The root mean square value of the solid volume fraction shows the increasing trend with volume fraction, caused by the many particle interactions. Furthermore, no-slip sidewalls were found to damp the velocity fluctuations quantitively, while following the well-known ϕ 1 / 2 scaling with volume fraction. Side walls were found to act as kinetic trap for the particles, damping the fluctuation near the walls and plateauing in the mid plane. These simulations showed that the GS system shows the higher solid fraction fluctuations that the LS system at the same Reynolds number, mainly because of the higher collision frequency (higher Stokes number) among the particles.

Keywords: average sedimentation velocity; Eulerian two fluid model; inter-particle interactions; sedimentation; velocity fluctuations
Corresponding author: Adnan Hamid, Department of Chemical Engineering, Pakistan Institute of Engineering and Applied Sciences, 45650, Islamabad, Pakistan, E-mail:

Funding source: PIEAS

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

  2. Research funding: First author acknowledges the fellowships she received for her MS Process Engineering at PIEAS.

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

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/ijcre-2021-0126).

Received: 2021-05-10
Accepted: 2021-08-12
Published Online: 2021-08-27

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Preface: Special issue of “Multiphase Flows in Process Engineering: Recent Experimental, Theoretical and Numerical Developments”
  4. Special Issue Articles
  5. Effects of periodic cavitation on steam–water flow regime transition and mixing near steam nozzle exit
  6. Effects of boundary walls on the properties of settling spheres
  7. Convective heat transfer in magnetized flow of nanofluids between two rotating parallel disks
  8. Nonlinear radiative transport of hybrid nanofluids due to moving sheet with entropy generation
  9. Modeling evaluation on solid-liquid mixing characteristics in a dislocated guide impeller stirred tank
  10. Experimental and simulation study on mixing time and suspension quality of liquid-solid flow field in stirred reactor with draft tube
  11. Heat transfer enhancement of hybrid nanofluids over porous cone
  12. Numerical study of a fractal-like tree node micromixer based on Murray’s law
  13. Floating particles mixing characteristics in an eccentric stirred tank coupled with dislocated fractal impellers
https://doi.org/10.1515/ijcre-2021-0126
Schlagwörter für diesen Artikel
average sedimentation velocity; Eulerian two fluid model; inter-particle interactions; sedimentation; velocity fluctuations

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Preface: Special issue of “Multiphase Flows in Process Engineering: Recent Experimental, Theoretical and Numerical Developments”
  4. Special Issue Articles
  5. Effects of periodic cavitation on steam–water flow regime transition and mixing near steam nozzle exit
  6. Effects of boundary walls on the properties of settling spheres
  7. Convective heat transfer in magnetized flow of nanofluids between two rotating parallel disks
  8. Nonlinear radiative transport of hybrid nanofluids due to moving sheet with entropy generation
  9. Modeling evaluation on solid-liquid mixing characteristics in a dislocated guide impeller stirred tank
  10. Experimental and simulation study on mixing time and suspension quality of liquid-solid flow field in stirred reactor with draft tube
  11. Heat transfer enhancement of hybrid nanofluids over porous cone
  12. Numerical study of a fractal-like tree node micromixer based on Murray’s law
  13. Floating particles mixing characteristics in an eccentric stirred tank coupled with dislocated fractal impellers
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