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Continuous to intermittent flows in growing granular heaps.

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Summary
This summary is machine-generated.

Researchers studied sandpile avalanches, finding the critical size for intermittent flow depends linearly on input flux and the square root of feeding height. This work explains intermittent granular flow dynamics.

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Area of Science:

  • Physics
  • Complex Systems
  • Materials Science

Background:

  • Granular materials exhibit complex flow behaviors, including intermittent avalanches.
  • Understanding the transition from smooth flow to avalanche dynamics in sandpiles is crucial for predicting granular material behavior.

Purpose of the Study:

  • To investigate the factors influencing the critical pile size (X_{c}) at which granular flow transitions to intermittent avalanches.
  • To develop a phenomenological model explaining the observed scaling relationships for X_{c}.

Main Methods:

  • Controlled laboratory experiments involving pouring granular material between parallel plates.
  • Systematic variation of the feeding height and input flux to observe changes in pile growth and avalanche behavior.
  • Development of a phenomenological model based on experimental observations of flowing and static granular phases.

Main Results:

  • The critical pile size (X_{c}) for intermittent flow scales linearly with the input flux.
  • X_{c} scales with the square root of the feeding height.
  • A phenomenological model was developed, incorporating the concept of a flowing granular 'wedge' on static material.
  • The model successfully predicts X_{c} for situations with decreasing feeding height.

Conclusions:

  • The transition to intermittent avalanching in sandpiles is governed by input flux and feeding height.
  • A novel phenomenological model accurately describes the dynamics of granular flow and avalanche prediction.
  • Controlled experiments provide insights into complex granular material behavior and predictive capabilities.