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Nonspherical particles in a pseudo-2D fluidized bed: Experimental study.

Vinay V Mahajan1, Johan T Padding1, Tim M J Nijssen2

  • 1Dept. of Process and Energy Delft University of Technology 2628 CB Delft The Netherlands.

Aiche Journal. American Institute of Chemical Engineers
|May 1, 2018
PubMed
Summary
This summary is machine-generated.

Particle shape significantly impacts fluidization. This study reveals rod-like particles exhibit interlocking and channeling, leading to unique bubbling and circulation patterns in fluidized beds.

Keywords:
Digital Image AnalysisParticle Image VelocimetryParticle Tracking Velocimetrybed heightfluidizationnonsphericalorientationpressure drop

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Area of Science:

  • Chemical Engineering
  • Particle Technology

Background:

  • Fluidization is a key industrial process, extensively studied.
  • Most research focuses on spherical particles, neglecting real-world non-spherical granules.
  • Particle shape critically influences fluidization dynamics.

Purpose of the Study:

  • To investigate the fluidization behavior of non-spherical, rod-like particles.
  • To characterize the impact of particle shape on fluidization characteristics.
  • To compare experimental results with existing pressure drop correlations for nonspherical particles.

Main Methods:

  • Experiments conducted in pseudo-2D fluidized beds.
  • Utilized pressure drop measurements.
  • Employed optical methods: Digital Image Analysis (DIA), Particle Image Velocimetry (PIV), and Particle Tracking Velocimetry (PTV).

Main Results:

  • Rod-like particles (aspect ratio 4) demonstrated interlocking and channeling.
  • Observed vigorous bubbling fluidization with particle ejection and dispersion.
  • Identified a central upward and wall downward circulation pattern at high flow rates.
  • Measured bed height, particle orientation, circulation, stacking, and coordination number.

Conclusions:

  • Particle shape, specifically rod-like geometry, introduces complex behaviors like interlocking not seen with spheres.
  • Existing pressure drop correlations may not accurately predict fluidization for such nonspherical particles.
  • Understanding these shape-dependent phenomena is crucial for optimizing industrial fluidization processes.