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Sinking dynamics and splitting of a granular droplet

Jens P. Metzger1,*, Christopher P. McLaren1,*, Sebastian Pinzello1, Nicholas A. Conzelmann1, Christopher M. Boyce2, and Christoph R. Müller1,†

  • 1Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
  • 2Department of Chemical Engineering, Columbia University, New York, New York 10027, USA

  • *These authors contributed equally to this work.
  • †muelchri@ethz.ch
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Phys. Rev. Fluids 7, 014309 – Published 24 January, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.014309

Abstract

Recent experimental results have shown that binary granular materials fluidized by combined vibration and gas flow exhibit Rayleigh-Taylor-like instabilities that manifest themselves in rising plumes, rising bubbles, and the sinking and splitting of granular droplets. This work explores the physics behind the splitting of a granular droplet that is composed of smaller and denser particles in a bed of larger and lighter particles. During its sinking motion, a granular droplet undergoes a series of binary splits resembling the fragmentation of a liquid droplet falling in a miscible fluid. However, different physical mechanisms cause a granular droplet to split. By applying particle image velocimetry and numerical simulations, we demonstrate that the droplet of high-density particles causes the formation of an immobilized zone underneath the droplet. This zone obstructs the downwards motion of the droplet and causes the droplet to spread and ultimately to split. The resulting fragments sink at inclined trajectories around the immobilized zone until another splitting event is initiated. The occurrence of consecutive splitting events is explained by the reformation of an immobilized zone underneath the droplet fragments. Our investigations identified three requirements for a granular droplet to split: (1) frictional interparticle contacts, (2) a higher density of the particles composing the granular droplet compared to the bulk particles, and (3) a minimal granular droplet diameter.

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Information

Phys. Rev. Fluids 7, 014309– Published 24 January, 2022
  • Received 9 August 2021
  • Accepted 16 December 2021
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