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• W2149509099 abstract "We develop a computational framework, based on the Boltzmann transport equation (BTE), with the ability to compute thermal transport in nanostructured materials of any geometry using, as the only input, the bulk cumulative thermal conductivity. The main advantage of our method is twofold. First, while the scattering times and dispersion curves are unknown for most materials, the phonon mean free path (MFP) distribution can be directly obtained by experiments. As a consequence, a wider range of materials can be simulated than with the frequency-dependent (FD) approach. Second, when the MFP distribution is available from theoretical models, our approach allows one to include easily the material dispersion in the calculations without discretizing the phonon frequencies for all polarizations thereby reducing considerably computational effort. Furthermore, after deriving the ballistic and diffusive limits of our model, we develop a multiscale method that couples phonon transport across different scales, enabling efficient simulations of materials with wide phonon MFP distributions length. After validating our model against the FD approach, we apply the method to porous silicon membranes and find good agreement with experiments on mesoscale pores. By enabling the investigation of thermal transport in unexplored nanostructured materials, our method has the potential to advance high-efficiency thermoelectric devices." @default.
• W2149509099 created "2016-06-24" @default.
• W2149509099 creator A5063590702 @default.
• W2149509099 creator A5083309623 @default.
• W2149509099 date "2015-07-01" @default.
• W2149509099 modified "2023-09-26" @default.
• W2149509099 title "Heat Conduction in Nanostructured Materials Predicted by Phonon Bulk Mean Free Path Distribution" @default.
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• W2149509099 doi "https://doi.org/10.1115/1.4029775" @default.
• W2149509099 hasPublicationYear "2015" @default.
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