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Frozen Cheerios effect: Particle-particle interaction induced by an advancing solidification front

Jochem G. Meijer1,*,†, Vincent Bertin1,*,‡, and Detlef Lohse1,2,§

  • *These authors contributed equally to this work.
  • †Contact author: jgmeijer@uchicago.edu
  • ‡Contact author: vincent.bertin.1@univ-amu.fr
  • §Contact author: d.lohse@utwente.nl
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Phys. Rev. Fluids 10, 034002 – Published 28 March, 2025

DOI: https://doi.org/10.1103/PhysRevFluids.10.034002

Abstract

Particles at liquid interfaces have the tendency to cluster due to capillary forces competing with gravitational buoyancy (i.e., normal to the distorted free surface). This is known as the Cheerios effect. Here we experimentally and theoretically study the interaction between two submerged particles near an advancing water-ice interface during the freezing process. Particles that are thermally more conductive than water are observed to attract each other and form clusters once frozen. We call this feature the frozen Cheerios effect, where interactions are driven by alterations to the direction of the experienced repelling force (i.e., normal to the distorted isotherm). On the other hand, particles less conductive than water separate, highlighting the importance of thermal conduction during freezing. Based on existing models for single particle trapping in ice, we develop an understanding of multiple particle interaction. We find that the overall efficacy of the particle-particle interaction critically depends on the solidification front velocity. Our theory explains why the thermal conductivity mismatch between the particles and water dictates the attractive or repulsive nature of the particle-particle interaction.

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Phys. Rev. Fluids 10, 034002– Published 28 March, 2025
  • Received 26 July 2024
  • Accepted 10 March 2025
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