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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Dimensional effects in Rayleigh-Taylor mixing.

Guido Boffetta1, Stefano Musacchio1

  • 1Department of Physics and INFN, via P. Giuria 1, 10125 Torino, Italy.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|January 31, 2022
PubMed
Summary

Dimensional confinement, like in two-dimensional flow, speeds up Rayleigh-Taylor mixing in bulk and porous media. This effect enhances mass transfer efficiency by strengthening density-velocity correlations.

Keywords:
Rayleigh–Taylor mixingturbulenceturbulent convection

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Area of Science:

  • Fluid dynamics
  • Multiphase flow

Background:

  • Rayleigh-Taylor instability drives mixing in stratified fluids.
  • Understanding mixing in confined geometries is crucial for various applications.

Purpose of the Study:

  • To investigate the impact of dimensional confinement on Rayleigh-Taylor mixing.
  • To compare mixing dynamics in bulk flow versus porous media.

Main Methods:

  • Numerical simulations of transport equations.
  • Analysis of incompressible flow dynamics.

Main Results:

  • Two-dimensional confinement accelerates mixing and increases mixing layer speed.
  • Stronger density-velocity correlations observed due to confinement.
  • Enhanced mass transfer efficiency, indicated by Nusselt number dependence on Rayleigh number.

Conclusions:

  • Dimensional confinement significantly alters Rayleigh-Taylor mixing dynamics.
  • Confinement enhances mixing efficiency through altered field correlations.