Special Issue "Nanoscale Heat Transfer Phenomena: Ballisticity, Rectification, Collective Modes, Thermohydrodynamics"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (15 July 2021).

Special Issue Editor

Dr. Termentzidis Konstantinos
E-Mail Website
Guest Editor
Laboratoire CETHIL UMR 5008, CNRS, INSA of Lyon, Un. Claude-Bernard Lyon 1, LyonTech la Doua Campus, Bat Sadi Carnot, INSA de LYON, 9 Rue de la Physique, 69100 Villeurbanne, France
Interests: Heat transfer models and simulations; nanostructured semiconductors; thermal conductivity; atomistic simulations

Special Issue Information

Dear Colleagues,

The thermal transport differs significantly at nanostructures and nanostructured materials compared to their bulk state. In the last two decades, both computational and experimental studies have revealed several new phenomena like phonon confinement; blocking/focusing; or coherent, collective thermohydrodynamics, as well rectification effects and new regimes like ballistic or quasiballistic related to like-Levy phonon flights. Observations showed that the Boltzmann Transport Equation cannot capture these phenomena, as there is a breakdown of the macroscopic, well-established heat dissipation theory due to the relative comparison of the phonon mean free paths with the characteristic dimensions of the nanostructures and the presence of interfaces and free surfaces.

This Special Issue of Nanomaterials will attempt to cover the most recent advances in “Nanoscale Heat Transfer Phenomena” and both experimental and theoretical evidences of ballistic transport, rectification, phonon collective modes, Levy phonon flights, and classical thermohydrodynamics.

Dr. Termentzidis Konstantinos
Guest Editor

Manuscript Submission Information

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Keywords

  • nanostructures and nanostructured materials
  • phonon confinement
  • coherence
  • collective modes
  • thermohydrodynamics
  • rectification effects
  • ballistic or quasi-ballistic regime
  • experimental and theoretical studies.

Published Papers (2 papers)

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Research

Article
Ballistic Heat Transport in Nanocomposite: The Role of the Shape and Interconnection of Nanoinclusions
Nanomaterials 2021, 11(8), 1982; https://doi.org/10.3390/nano11081982 - 31 Jul 2021
Viewed by 474
Abstract
In this article, the effect on the vibrational and thermal properties of gradually interconnected nanoinclusions embedded in an amorphous silicon matrix is studied using molecular dynamics simulations. The nanoinclusion arrangement ranges from an aligned sphere array to an interconnected mesh of nanowires. Wave-packet [...] Read more.
In this article, the effect on the vibrational and thermal properties of gradually interconnected nanoinclusions embedded in an amorphous silicon matrix is studied using molecular dynamics simulations. The nanoinclusion arrangement ranges from an aligned sphere array to an interconnected mesh of nanowires. Wave-packet simulations scanning different polarizations and frequencies reveal that the interconnection of the nanoinclusions at constant volume fraction induces a strong increase of the mean free path of high frequency phonons, but does not affect the energy diffusivity. The mean free path and energy diffusivity are then used to estimate the thermal conductivity, showing an enhancement of the effective thermal conductivity due to the existence of crystalline structural interconnections. This enhancement is dominated by the ballistic transport of phonons. Equilibrium molecular dynamics simulations confirm the tendency, although less markedly. This leads to the observation that coherent energy propagation with a moderate increase of the thermal conductivity is possible. These findings could be useful for energy harvesting applications, thermal management or for mechanical information processing. Full article
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Article
High Surface Phonon-Polariton in-Plane Thermal Conductance along Coupled Films
Nanomaterials 2020, 10(7), 1383; https://doi.org/10.3390/nano10071383 - 15 Jul 2020
Cited by 1 | Viewed by 1043
Abstract
Surface phonon-polaritons (SPhPs) are evanescent electromagnetic waves that can propagate distances orders of magnitude longer than the typical mean free paths of phonons and electrons. Therefore, they are expected to be powerful heat carriers capable of significantly enhancing the in-plane thermal conductance of [...] Read more.
Surface phonon-polaritons (SPhPs) are evanescent electromagnetic waves that can propagate distances orders of magnitude longer than the typical mean free paths of phonons and electrons. Therefore, they are expected to be powerful heat carriers capable of significantly enhancing the in-plane thermal conductance of polar nanostructures. In this work, we show that a SiO2/Si (10 μm thick)/SiO2 layered structure efficiently enhances the SPhP heat transport, such that its in-plane thermal conductance is ten times higher than the corresponding one of a single SiO2 film, due to the coupling of SPhPs propagating along both of its polar SiO2 nanolayers. The obtained results thus show that the proposed three-layer structure can outperform the in-plane thermal performance of a single suspended film while improving significantly its mechanical stability. Full article
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