Collision dynamics of granular particles with adhesion
Nikolai V Brilliantov1, Nicole Albers, Frank Spahn
1Institute of Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 1, 2008
Summary
This study examines adhesive viscoelastic sphere collisions using the Johnson, Kendall, and Roberts (JKR) theory. Results show the coefficient of restitution and critical aggregation velocity depend on impact velocity and particle size, matching experimental data.
Area of Science:
- Physics
- Materials Science
- Surface Science
Background:
- Adhesive interactions are crucial in particle collisions.
- Understanding viscoelastic sphere behavior is key in various applications.
Purpose of the Study:
- To investigate the collision dynamics of adhesive viscoelastic spheres.
- To analyze the influence of the Johnson, Kendall, and Roberts (JKR) theory on collision outcomes.
- To quantify restitution and aggregation behaviors.
Main Methods:
- Utilized quasistatic approximation for collision analysis.
- Employed dynamic contact force models.
- Incorporated the Johnson, Kendall, and Roberts (JKR) theory for adhesion.
Main Results:
- Developed models for restitutive collisions (coefficient of restitution, ε).
- Characterized aggregative collisions (critical aggregation velocity, gcr).
- Demonstrated sensitive dependence of ε and gcr on impact velocity and particle size.
Conclusions:
- The JKR theory accurately describes adhesive viscoelastic sphere collisions.
- Collision outcomes are predictable based on impact velocity and particle size.
- Findings align well with laboratory experimental results.
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