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Physics of Fluids / Volume 6 / Issue 3

Phys. Fluids 6, 1108 (1994); http://dx.doi.org/10.1063/1.868282 (8 pages)

Measurements of the collision properties of small spheres

Samuel F. Foerster, Michel Y. Louge, Hongder Chang, and Khédidja Allia

Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853

(Received 9 June 1993; accepted 2 November 1993)

An experiment to measure the properties of the collisions between two small spheres or between a small sphere and a semi‐infinite flat wall are described. The apparatus releases the particles in a free‐fall without initial spin. The impacts are modeled in terms of three coefficients. The first is the coefficient of normal restitution. The second represents the frictional properties of the contact surfaces. The last characterizes the restitution of the tangential components of the velocity of the contact point for impacts that do not involve sliding. The coefficients are calculated from stroboscopic photographs of the ballistics of the particles near the collision. The results establish that the collision model provides an accurate description of the dynamics of the impacts.

KEYWORDS and PACS

Keywords

IMPACT PHENOMENA, SPHERES, COLLISIONS, GRANULAR MATERIALS, MEASURING METHODS, FRICTION, FLOW MODELS

PACS

  • 81.05.Rm

    Porous materials; granular materials

  • 45.05.+x

    General theory of classical mechanics of discrete systems

  • 83.80.Fg

    Granular solids

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.868282

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

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