Výsledky vyhledávání - "Ramu, Ashok T."

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Reduction of the effective thermal conductivity by circulation of the quasi-ballistic heat-flux

Autor: Ramu, Ashok T., Meinhart, Carl D., Bowers, John E.

For a thermal conductivity that is spatially uniform and independent of temperature, Fourier's law of heat transfer predicts a curl-free heat-flux. In the quasi-ballistic phonon transport regime, where the Fourier law breaks down, it has been proven

Externí odkaz: http://arxiv.org/abs/1602.00380

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An electrical probe of the phonon mean-free path spectrum

Autor: Ramu, Ashok T., Halaszynski, Nicole I., Peters, Jonathan D., Meinhart, Carl D., Bowers, John E.

Most studies of the mean-free path accumulation function (MFPAF) rely on optical techniques to probe heat transfer at length scales on the order of the phonon mean-free path. In this paper, we propose and implement a purely electrical probe of the MF

Externí odkaz: http://arxiv.org/abs/1602.00381

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A generalized enhanced Fourier law and underlying connections to major frameworks for quasi-ballistic phonon transport

Autor: Ramu, Ashok T., Bowers, John E.

An enhanced Fourier law (EFL) that accounts for quasi-ballistic phonon transport effects in a formulation entirely in terms of physical observables, is derived from the Boltzmann transport equation, assuming a gray population of quasi-ballistic phono

Externí odkaz: http://arxiv.org/abs/1506.00668

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On the solenoidal heat-flux in quasi-ballistic thermal conduction

Autor: Ramu, Ashok T., Bowers, John E.

The Boltzmann transport equation for phonons is recast directly in terms of the heat-flux by means of iteration followed by truncation at the second order in the spherical harmonic expansion of the distribution function. This procedure displays the h

Externí odkaz: http://arxiv.org/abs/1505.02465

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A compact heat transfer model based on an enhanced Fourier law for analysis of frequency-domain thermoreflectance experiments

Autor: Ramu, Ashok T., Bowers, John E.

A recently developed enhanced Fourier law is applied to the problem of extracting thermal properties of materials from frequency-domain thermoreflectance (FDTR) experiments. The heat transfer model comprises contributions from two phonon channels; on

Externí odkaz: http://arxiv.org/abs/1504.04775

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Quasi-ballistic phonon transport effects on the determination of the mean-free path accumulation function for the effective thermal conductivity

Autor: Ramu, Ashok T., Bowers, John E.

The mean-free path (MFP) accumulation function for the effective thermal conductivity, introduced by Dames and Chen is a compact, universal and highly useful summary of the effect of ballistic thermal transport on the effective thermal conductivity m

Externí odkaz: http://arxiv.org/abs/1502.06005

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