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Related Experiment Videos

Sinking a Granular Raft.

Suzie Protière1, Christophe Josserand1, Jeffrey M Aristoff2

  • 1CNRS UMR 7190, Sorbonne Universités, UPMC Univ Paris 06, Institut Jean Le Rond d'Alembert, F-75005 Paris, France.

Physical Review Letters
|March 25, 2017
PubMed
Summary
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Granular rafts at oil-water interfaces can float or sink based on particle and fluid properties. Their shape, stability, and wrinkling due to self-weight compression are analyzed, revealing elastic instability phenomena.

Area of Science:

  • Soft matter physics
  • Fluid dynamics
  • Materials science

Background:

  • Granular rafts, or particle aggregates, at fluid interfaces exhibit complex behaviors.
  • Understanding their stability and shape is crucial for various applications, from material assembly to understanding natural phenomena.

Purpose of the Study:

  • To investigate the factors influencing the flotation or sinking of granular rafts.
  • To characterize the shape, stability, and destabilization mechanisms of these rafts.
  • To develop a predictive model for raft behavior.

Main Methods:

  • Experimental observation of granular rafts at an oil-water interface.
  • Systematic variation of dimensionless parameters including particle and fluid densities, and particle size.

Related Experiment Videos

  • Analysis of raft shape, stability, and the emergence of structural features like wrinkles and folds.

    • Main Results:

    • Raft behavior (floating or sinking) is determined by dimensionless parameters related to densities and size.
    • A model is proposed to predict raft shape and maximum floating length.
    • Compression due to self-weight induces wrinkles and folds, characteristic of elastic instability, which can lead to raft destabilization.

    Conclusions:

    • The study provides new insights into granular raft mechanics at fluid interfaces.
    • The findings highlight the role of self-weight induced elastic instability in raft destabilization.
    • The developed model offers a framework for predicting raft behavior, with acknowledged limitations.