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Area of Science:

  • Physics
  • Geophysics
  • Complex Systems

Background:

  • Granular avalanches on inclines are well-studied phenomena.
  • External factors can influence granular flow dynamics.
  • Understanding flow arrest is crucial for predicting avalanche behavior.

Purpose of the Study:

  • To investigate the effect of external mechanical vibrations on granular avalanches.
  • To identify conditions leading to flow arrest under vibration.
  • To develop an empirical law for deposit thickness and analyze flow regimes.

Main Methods:

  • Experimental study of granular avalanches with applied mechanical vibrations.
  • Comparison of flow arrest conditions with non-vibrating systems.
  • Development of an empirical law relating deposit thickness to inclination angle and vibration intensity.
  • Analysis of surface velocity and flow depth to understand competing forces.

Main Results:

  • Identified conditions for flow arrest influenced by vibrations.
  • Proposed an empirical law for deposit thickness based on inclination and vibration intensity.
  • Distinguished between gravity-driven flows (large angles) and vibration-driven flows (small angles).
  • Observed that vibrations do not alter dynamics in gravity-driven flows but significantly impact vibration-driven flows.

Conclusions:

  • External mechanical vibrations offer a method to finely tune granular flows down inclined planes.
  • Two distinct flow regimes (gravity-driven and vibration-driven) were identified and characterized.
  • The study provides insights into the interplay between gravity, vibrations, and granular material flow behavior.