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Multifractal Intermittency in Granular Flow through Bottlenecks.

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|December 7, 2019
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Granular silo flow exhibits complex intermittent behaviors, transitioning from on-off to multifractal intermittency as extraction rates increase. Flow dynamics depend on outlet size, revealing distinct monofractal or non-Gaussian behaviors at high rates.

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Area of Science:

  • Physics
  • Engineering
  • Materials Science

Background:

  • Granular materials exhibit complex flow behaviors, particularly in confined systems like silos.
  • Understanding intermittency in granular flow is crucial for industrial processes involving powders and grains.

Purpose of the Study:

  • To experimentally investigate the intermittent dynamics of granular silo flow controlled by an extracting belt.
  • To identify and characterize different flow regimes based on extraction rates and outlet size.

Main Methods:

  • Experimental setup using an extracting belt to control granular discharge from a silo.
  • Analysis of grain velocity increments and their structure functions at various lag times.
  • Characterization of flow intermittency using fractal and statistical analyses.

Main Results:

  • Observed four distinct flow scenarios, including on-off intermittency at low extraction rates.
  • Identified emergence of multifractal intermittency with increasing extraction rates.
  • Demonstrated outlet size dependency at high extraction rates, leading to monofractal or non-Gaussian velocity increment fluctuations.

Conclusions:

  • Granular silo flow dynamics are highly sensitive to extraction rate and outlet geometry.
  • The study reveals a transition from simple to complex intermittent behaviors, including multifractality.
  • Findings contribute to a deeper understanding of granular material flow and control in industrial applications.