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Rayleigh instability at small length scales.

Nandu Gopan1, Sarith P Sathian2

  • 1Computational Nanotechnology Laboratory, School of Nanoscience and Technology, NITC, Kozhikode, Kerala, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 15, 2014
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations reveal that thermal fluctuations accelerate the breakup of nanoscale liquid propane threads during the final stages. Evaporation-condensation also modifies the breakup profile of these tiny liquid threads.

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Area of Science:

  • Fluid dynamics
  • Nanoscale science
  • Statistical mechanics

Background:

  • Classical theories of Rayleigh instability may not apply at nanoscale.
  • Thermal fluctuations are known to be significant at small length scales.
  • Previous studies suggest thermal fluctuations dominate nanoscale phenomena.

Purpose of the Study:

  • Investigate Rayleigh instability in nanosized liquid propane threads.
  • Validate classical predictions at small length scales using molecular dynamics.
  • Determine the influence of thermal fluctuations on nanoscale liquid thread instability.

Main Methods:

  • Molecular dynamics (MD) simulations were employed.
  • Simulated temporal evolution of liquid threads was compared to classical predictions.
  • The role of thermal fluctuations in instability was analyzed.

Main Results:

  • Classical predictions were validated for nanoscale liquid threads.
  • Thermal fluctuations were found to dominate and accelerate breakup in the final stages.
  • Evaporation-condensation processes were observed to modify breakup profiles.

Conclusions:

  • Rayleigh instability in nanoscale liquid threads is influenced by thermal fluctuations.
  • Molecular dynamics is a suitable method for studying nanoscale fluid instabilities.
  • Evaporation-condensation plays a role in nanoscale liquid thread breakup dynamics.