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Characterization of base roughness for granular chute flows.

L Jing1, C Y Kwok1, Y F Leung2

  • 1Department of Civil Engineering, The University of Hong Kong, Haking Wong Building, Pokfulam Road, Hong Kong.

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|December 15, 2016
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Summary

This study introduces a new way to measure base roughness (Ra) in granular flows, considering particle size and arrangement. Higher roughness values predict a transition from slipping to non-slipping conditions at the base.

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Area of Science:

  • Physics
  • Engineering
  • Geology

Background:

  • Base roughness significantly impacts granular flow dynamics but lacks precise quantification methods.
  • Existing models often overlook key geometric factors like particle size ratios and base packing arrangements.

Purpose of the Study:

  • To propose and validate a new, generalized definition of base roughness (Ra) for granular flows.
  • To establish a predictive relationship between base roughness and slip/nonslip conditions in granular chutes.
  • To identify critical roughness values for designing nonslip granular bases.

Main Methods:

  • Developed a novel definition of base roughness (Ra) incorporating size ratio and particle distribution.
  • Generalized the Ra definition for both random and regular multilayered sphere packings.
  • Applied the Ra definition to 2D and 3D granular chute flow simulations.

Main Results:

  • The proposed base roughness (Ra) definition successfully predicts slip occurrence in granular chute flows.
  • A clear transition from slip to nonslip conditions was observed as Ra increased.
  • Critical Ra values were determined for achieving nonslip bases across different inclination angles.

Conclusions:

  • The new Ra definition offers a quantifiable metric for base roughness in granular flows.
  • Base roughness is a critical factor controlling slip behavior, with predictable transitions.
  • This work provides practical insights for engineering nonslip granular surfaces.