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Confinement effects in premelting dynamics.

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Confinement affects premelted film dynamics driven by thermomolecular pressure. Increased viscosity due to film thinning impacts elastic wall evolution and liquid flux, with implications for frost heave.

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Premelted films exhibit temperature-dependent viscosity changes.
  • Thermomolecular pressure gradients drive fluid flow in thin films.
  • Interfacial premelting is influenced by material interactions and confinement.

Purpose of the Study:

  • To investigate the impact of confinement on premelted film dynamics.
  • To model the effects of increased viscosity in thinning films using a power law.
  • To analyze the evolution of a confining elastic wall under these conditions.

Main Methods:

  • Modification of a standard model for thermomolecular pressure-driven flow.
  • Application of a power-law model for viscosity increase with decreasing film thickness.
  • Examination of various interfacial premelting interactions and constant temperature gradients.

Main Results:

  • The proximity effect significantly alters the volume flux of premelted liquid.
  • Increased viscosity at smaller film thicknesses necessitates higher temperatures for flux accommodation.
  • Confinement influences the elastic wall's response to thermomolecular pressure.

Conclusions:

  • Confinement and proximity effects are crucial for understanding premelted film dynamics.
  • The study provides insights into phenomena like frost heave.
  • Further experimental validation is suggested for the observed effects.