Decoupling Geometrical and Kinematic Contributions to the Silo Clogging Process
D Gella1, I Zuriguel1, D Maza1
1Departamento de Física y Matemática Aplicada, Facultad de Ciencias, Universidad de Navarra, Pamplona, Spain.
Physical Review Letters
|October 13, 2018
Summary
Controlling grain velocity during silo discharge is key to preventing clogging. Lowering grain speeds significantly increases clogging probability, highlighting the importance of particle motion in silo flow dynamics.
Area of Science:
- Granular physics
- Material science
- Fluid dynamics
Background:
- Silo clogging is a common issue in granular material handling.
- Existing models often overlook the role of particle kinematics.
Purpose of the Study:
- To investigate the independent contributions of outlet size and grain velocity to silo clogging.
- To develop a more comprehensive model for predicting silo clogging probability.
Main Methods:
- Implementation of a novel silo discharge procedure to control grain velocities.
- Systematic variation of outlet size and grain velocity.
- Analysis of clogging probability under different conditions.
Main Results:
- Grain velocity significantly impacts clogging probability, with lower velocities increasing it by nearly two orders of magnitude.
- Results align with existing exponential models relating clogging to outlet size.
- A modified expression is proposed, incorporating both geometric and kinematic parameters.
Conclusions:
- Particle kinematics is a critical factor in silo clogging, not just outlet geometry.
- The proposed modified expression offers a more accurate prediction of silo clogging.
- This research provides a foundation for optimizing silo discharge processes.
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