Novel approach for measurement of restitution coefficient by magnetic particle tracking

Inter particular contacts between particles are of great interest, as the intensity and quantity of contacts impact the behavior of a wide variety of industrial processes. The coefficient of restitution is commonly used to describe the collision of a particle either with other particles or with walls and components of plant equipment. The coefficient considers the amount of energy that is dissipated in the collision event. Usually the restitution coefficient is examined by the use of high speed cameras and image velocimetry. In this study a new method based on magnetic particle tracking (MPT) was developed to measure the restitution coefficient of magnetic particles. By performing simultaneous image velocimetry and MPT measurements, the novel approach is validated. The comparison shows a high coincidence of the results from both measurement methods, both for normal direction impacts as well as impacts on oblique sur-faces. Furthermore, the rotation of particles was investigated (by rolling down a tilted plate), which has also shown the applicability of the MPT measurement method. (c) 2021 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. This is an open access article under the CC BY-NC-ND license (http://creativecommons. org/licenses/by-nc-nd/4.0/).

Automated summary

Interparticle contacts play a crucial role in industrial processes, and the coefficient of restitution is commonly used to describe particle collisions. This study developed a new method based on magnetic particle tracking (MPT) to measure the restitution coefficient of magnetic particles, and validated it by comparing with image velocimetry. The results showed a high coincidence between the two methods, and the applicability of the MPT method in studying particle rotation was also demonstrated.