Probing the nature of the contact between fine particles by using ultrasound propagation--颗粒学报PARTICUOLOGY

Castellanos, A., Jia, X., Soria-Hoyo, C., & Valverde, J. M. (2011). Probing the nature of the contact between fine particles by using ultrasound propagation. Particuology, 9(6), 659–662. https://doi.org/10.1016/j.partic.2011.06.009

Probing the nature of the contact between fine particles by using ultrasound propagation

Antonio Castellanos ^a, Xiaoping Jia ^b, Carlos Soria-Hoyo ^a, Jose Manuel Valverde ^a *

a Faculty of Physics, University of Seville, Avda. Reina Mercedes s/n, 41012 Seville, Spain
b LPMDI, Universite de Marne-la-Vallee, CNRS UMR 8108, Champs sur Marne, France

10.1016/j.partic.2011.06.009

Volume 9, Issue 6, December 2011, Pages 659-662

Received 2 December 2010, Revised 13 May 2011, Accepted 7 June 2011, Available online 22 October 2011.

E-mail: jmillan@us.es

Highlights

Abstract

The propagation velocity v_s of an ultrasonic signal through a granular material depends on the type of interparticle contact. For noncohesive glass beads, a power law behavior v_s ∝ σ_c^1/6for consolidation stresses applied (σ_c) above 1 MPa has been measured in previous work. This equation is compatible with Hertz's interaction law between elastic solids. In the present work, we have tested the propagation velocity of ultrasound signals through a sample of fine powder. The tensile strength and compactivity of the powder were previously measured by means of the Seville powder tester (SPT), indicating plastic deformation of the surface asperities in contact for small to moderate consolidation stresses. However, the measurements of ultrasound propagation at high consolidations presented here are compatible with Hertz's law. This finding suggests that for high consolidation stresses, surface asperities are flattened, and it is therefore the elastic deformation of the bulk of the particles that determines the transmission of ultrasonic pulses.

Graphical abstract

Keywords

Fine cohesive powder; Ultrasound propagation; Interparticle contact

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