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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Rayleigh-Taylor-instability experiments with elastic-plastic materials.

Rinosh Polavarapu1, Pamela Roach2, Arindam Banerjee1

  • 1Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

Physical Review. E
|June 20, 2019
PubMed
Summary
This summary is machine-generated.

This study explored Rayleigh-Taylor instability in soft solids using a rotating wheel. Lower initial amplitudes and 3D perturbations increased stability, requiring higher acceleration for instability.

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Area of Science:

  • Fluid Dynamics
  • Materials Science
  • Rheology

Background:

  • Rayleigh-Taylor instability is crucial in various physical phenomena.
  • Investigating this instability in elastic-plastic materials requires specialized experimental setups.
  • Understanding material properties like shear modulus and yield strength is key.

Purpose of the Study:

  • To develop and utilize a rotating wheel facility for studying incompressible Rayleigh-Taylor instability.
  • To characterize the behavior of elastic-plastic materials under instability conditions.
  • To compare experimental results with analytical models.

Main Methods:

  • A rotating wheel experimental facility was designed.
  • Mayonnaise was used as a model elastic-plastic material, characterized by rheometry.
  • Sinusoidal perturbations were introduced at the material interface.
  • Backlit imaging and high-speed cameras captured interface dynamics.

Main Results:

  • Exponential growth rates of instability were observed post-yielding.
  • Lower initial amplitudes and wavelengths increased the acceleration threshold for instability.
  • Three-dimensional perturbations exhibited greater stability compared to two-dimensional ones.
  • Decreased initial amplitude consistently enhanced interface stability.

Conclusions:

  • The study successfully investigated Rayleigh-Taylor instability in a model elastic-plastic material.
  • Initial perturbation characteristics significantly influence instability onset and growth.
  • The experimental findings provide valuable data for validating theoretical models of material instability.