Spectral mapping of heat transfer mechanisms at liquid-solid interfaces

Thermal transport through liquid-solid interfaces plays an important role in many chemical and biological processes, and better understanding of liquid-solid energy transfer is expected to enable improving the efficiency of thermally driven applications. We determine the spectral distribution of thermal current at liquid-solid interfaces from nonequilibrium molecular dynamics, delivering a detailed picture of the contributions of different vibrational modes to liquid-solid energy transfer. Our results show that surface modes located at the Brillouin zone edge and polarized along the liquid-solid surface normal play a crucial role in liquid-solid energy transfer. Strong liquid-solid adhesion allows also for the coupling of in-plane polarized modes in the solid with the liquid, enhancing the heat-transfer rate and enabling efficient energy transfer up to the cutoff frequency of the solid. Our results provide fundamental understanding of the energy-transfer mechanisms in liquid-solid systems and enable detailed investigations of energy transfer between, e.g., water and organic molecules.

DOI

10.1103/PhysRevE.93.052141

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Sääskilahti, K, Oksanen, J, Tulkki, J & Volz, S 2016, ' Spectral mapping of heat transfer mechanisms at liquid-solid interfaces ', Physical Review E, vol. 93, no. 5, 052141, pp. 1-8 . https://doi.org/10.1103/PhysRevE.93.052141

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https://urn.fi/URN:NBN:fi:aalto-201808084443

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[article-cris] Perustieteiden korkeakoulu / SCI

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Spectral mapping of heat transfer mechanisms at liquid-solid interfaces

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