EPJ Web Conf.
Volume 249, 2021Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
|Number of page(s)||4|
|Section||Cohesive Granular Materials|
|Published online||07 June 2021|
Erosion of a cohesive granular material by an impinging turbulent jet
Department of Mechanical Engineering, University of California, Santa Barbara, USA
2 Aix Marseille University, CNRS, IUSTI, Marseille, France
3 University Paris-Saclay, CNRS, Laboratoire FAST, Orsay, France
* e-mail: firstname.lastname@example.org
Published online: 7 June 2021
The erosion of a cohesive soil by an impinging turbulent jet is observed, for instance, during the landing of a spacecraft or involved in the so-called jet erosion test. To provide a quantitative understanding of this situation for cohesive soils, we perform experiments using a model cohesion controlled granular material that allows us to finely tune the cohesion between particles while keeping the other properties constant. We investigate the response of this cohesive granular bed when subjected to an impinging normal turbulent jet. We characterize experimentally the effects of the cohesion on the erosion threshold and the development of the crater. We demonstrate that the results can be rationalized by introducing a cohesive Shields number that accounts for the inter-particles cohesion force. The results of our experiments highlight the crucial role of cohesion in erosion processes.
A video is available at https://doi.org/10.48448/d34p-wj46
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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