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Solid-like heat transfer in confined liquids.

Michael Frank1, Dimitris Drikakis1

  • 1University of Strathclyde, Glasgow, G1 1XJ UK.

Microfluidics and Nanofluidics
|July 2, 2019
PubMed
Summary
This summary is machine-generated.

Confined liquids in nanochannels exhibit enhanced heat transport due to long-lived collective vibrations called phonons. This phenomenon, driven by increased structural order and relaxation times, enhances thermal conductivity in nanoscale systems.

Keywords:
Confined liquidDensity of statesHeat transferPhononsRelaxation timeThermal conductivity

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Area of Science:

  • Solid-state physics
  • Nanoscale heat transfer
  • Materials science

Background:

  • Heat transport across solid-liquid interfaces is crucial for many applications.
  • Understanding nanoscale thermal properties requires investigating liquid behavior under confinement.
  • Bulk liquids typically exhibit short phonon lifetimes, limiting their role in heat transport.

Purpose of the Study:

  • To elucidate the mechanisms governing heat transport at solid-liquid interfaces.
  • To investigate the unique vibrational dynamics of liquids confined within nanochannels.
  • To determine the impact of confinement on phonon propagation and thermal conductivity.

Main Methods:

  • Molecular dynamics simulations were employed to model heat transport.
  • Analysis focused on vibrational properties, phonon mean free path, and relaxation times.
  • Simulations considered liquid behavior in nanochannels of varying heights.

Main Results:

  • Liquids in nanochannels sustain long-lived collective vibrations (phonons) with extended propagation.
  • Increased structural order and liquid relaxation times in nanochannels enhance phonon mean free path.
  • For channels , phonons dominate parallel heat transfer, agreeing with experimental observations.
  • Confinement introduces additional transverse vibration modes, further boosting thermal conductivity.

Conclusions:

  • Confinement significantly alters liquid dynamics, promoting enhanced heat transport via phonons.
  • The findings provide a molecular-level understanding of thermal conductivity in confined liquids.
  • The study highlights the importance of vibrational modes in nanoscale thermal management.