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Dynamics of grain ejection by sphere impact on a granular bed
Summary
Sphere impacts on granular materials cause grain ejection, forming a "corona." This study quantifies ejection dynamics, finding the corona
Area of Science:
- Physics
- Materials Science
- Granular Dynamics
Background:
- Understanding granular material behavior under impact is crucial in various scientific and engineering fields.
- Sphere impacts trigger complex ejection phenomena, including the formation of granular coronas.
Purpose of the Study:
- To experimentally investigate the dynamics of grain ejection following a sphere impact on granular materials.
- To quantitatively analyze how ejection characteristics vary with control parameters.
- To compare experimental observations with a simple ballistic model.
Main Methods:
- Experimental investigation of grain ejection dynamics.
- Quantitative study of ejection characteristics (corona diameter, height, grain number, kinetic energy).
- Comparison of experimental data with a ballistic model.
Main Results:
- The time evolution of the granular corona's diameter and height was reported and found to agree with a ballistic model.
- A constant angle of the corona's edge with the granular surface was observed and reproduced by the ballistic model.
- An effective restitution coefficient was calculated, remaining constant across varied control parameters.
Conclusions:
- The study successfully characterized grain ejection dynamics post-impact using experimental and modeling approaches.
- A simple ballistic model effectively describes key features of the granular corona, including its constant edge angle.
- The effective restitution coefficient is a robust parameter, independent of control parameters in this system.
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