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Effects of surface friction on a two-dimensional granular system: cooling bound system
Meenakshi Dutt1, R P Behringer
1Department of Physics and Center of Nonlinear and Complex Systems, Duke University, Durham, North Carolina 27708-0305, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 9, 2005
Summary
Kinetic friction significantly impacts particle dynamics in granular materials. Surface friction and inelastic walls cause particle clustering, with friction dominating energy dissipation.
Area of Science:
- Physics
- Granular Mechanics
- Computational Physics
Background:
- Previous experiments highlighted substrate friction's role in particle collision dynamics.
- Kinetic friction specifically influences particle motion post-collision on a surface.
Purpose of the Study:
- To develop a numerical model for quasi-two-dimensional granular material cooling.
- To investigate the influence of collisional and surface frictional dissipation on particle dynamics.
Main Methods:
- A numerical model was developed, assuming collision dynamics depend solely on incoming velocities.
- The model simulates a monolayer of monodisperse particles on a substrate between inelastic walls.
- Focus on accounting for kinetic friction and inelastic wall interactions.
Main Results:
- Surface kinetic friction is dominant in quasi-two-dimensional granular systems with substrate contact.
- Simulations show surface friction and inelastic walls induce particle clustering near boundaries.
- Energy dissipation is highest when particles experience kinetic friction post-collision.
Conclusions:
- Kinetic friction is a critical factor in the dynamics of granular materials.
- Particle-wall collisions contribute more to energy dissipation than particle-particle collisions.
- The findings are crucial for understanding granular flow and energy loss mechanisms.