Journal
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Volume 142, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2022.106605
Keywords
Solid -liquid interface; Molecular dynamics simulation; Negative differential thermal resistance; Nanostructure
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In this study, the phenomenon of negative differential thermal resistance effect is observed in a solid-liquid-solid sandwiched system with a nanostructured cold surface. Non-equilibrium molecular dynamics simulations reveal that the heat flux initially increases with temperature bias for low temperature bias, but decreases counter-intuitively for high temperature bias. The negative differential thermal resistance effect at high temperature bias is attributed to the suppressed solid-liquid interfacial thermal conductance with decreasing temperature, as analyzed based on interfacial thermal resistance and density depletion length at the solid-liquid interface.
In this work, the negative differential thermal resistance effect has been proposed in a solid-liquid-solid sand-wiched system with a nanostructured cold surface. Non-equilibrium molecular dynamics simulations demon-strate that the heat flux in the present sandwiched system increases with the temperature bias for low temperature bias, while for high temperature bias, the heat flux decreases counter-intuitively with increasing temperature bias. Based on the analysis of the interfacial thermal resistance and the density depletion length at the solid-liquid interface, the negative differential thermal resistance effect at high temperature bias is attributed to the suppressed solid-liquid interfacial thermal conductance with decreasing temperature. In addition, it is found that the negative differential thermal resistance effect can be tuned by the size of the nanostructure.
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