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Keywords: phonons
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Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. May 2014, 136(5): 052401.
Paper No: HT-12-1637
Published Online: March 6, 2014
... to intermediate-frequency bands. The low frequency phonon band (0–5 THz) of top CNT shows two-stage energy relaxation which results from the efficient coupling of low frequency phonons in the CNT-oxide system and the blocking of direct transport of high- and intermediate-frequency phonons of top CNT to the oxide...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. June 2013, 135(6): 061604.
Paper No: HT-12-1575
Published Online: May 16, 2013
.... , 1993 , “ Kapitza Conductance and Heat Flow Between Solids at Temperatures From 50 to 300 K ,” Phys. Rev. B , 48 , pp. 16373–16387. 10.1103/PhysRevB.48.16373 [12] Beechem , T. , Duda , J. C. , Hopkins , P. E. , and Norris , P. M. , 2010 , “ Contribution of Optical Phonons...
Journal Articles
Publisher: ASME
Article Type: Micro/Nanoscale Heat Transfer
J. Heat Mass Transfer. August 2012, 134(8): 082401.
Published Online: June 5, 2012
...Chunjian Ni; Jayathi Y. Murthy A sub-micron thermal transport model based on the phonon Boltzmann transport equation (BTE) is developed using anisotropic relaxation times. A previously-published model, the full-scattering model, developed by Wang, directly computes three-phonon scattering...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. March 2012, 134(3): 031016.
Published Online: January 18, 2012
... . For phonon bands with Kn < Kn cutoff , a modified Fourier equation (MFE) is solved, while the nongray BTE (Eq. 3 ) is solved for phonon bands with Kn ≥ Kn cutoff. The modified Fourier equation is given by ∇ . ( k ω , p ∇ T ω , p ) + C ω , p τ ω , p...
Journal Articles
Publisher: ASME
Article Type: Heat Transfer In Nanochannels, Microchannels, And Minichannels
J. Heat Mass Transfer. February 2012, 134(2): 020910.
Published Online: December 22, 2011
... length within the resulting composite systems. Consequently, thermal transport in these systems is governed as much by the interfaces between the constituent materials as it is by the materials themselves. This paper reports the behavior of phononic thermal transport across interfaces between isotropic...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass Transfer. January 2012, 134(1): 014501.
Published Online: October 28, 2011
... crystallographic reconfigurations, where the atomic basis, symmetry, and periodicity of the alloy change dramatically. Consequently, phonon behavior in these alloys will vary greatly depending on the type and degree of ordering achieved. To investigate these phenomena, the role of the order–disorder transition...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass Transfer. November 2011, 133(11): 114502.
Published Online: September 20, 2011
...Zhen Huang; Jayathi Y. Murthy; Timothy S. Fisher In this work, the atomistic Green’s function method is extended to compute transmission functions for each phonon polarization. The eigenvectors and eigenvalues of the overall density of states matrices are manipulated to yield a density of states...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. November 2011, 133(11): 112402.
Published Online: September 19, 2011
... thermal wave resonance phonons multiscales Excitation of a structure at its resonant frequencies with large amplitude is undesirable in most engineering systems at macroscales due to its detrimental effect on the durability of the structure. As a result, the majority of systems at macroscales...
Journal Articles
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. September 2011, 133(9): 092401.
Published Online: July 7, 2011
... of thermoelectric devices. The current work explores the possibility of thermally rectifying devices with the use of nanostructured interfaces. Interfaces can theoretically result in thermally rectifying behavior because of the difference in phonon frequency content between two dissimilar materials. The current...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass Transfer. July 2011, 133(7): 074501.
Published Online: April 4, 2011
... conductance is driven by the phononic scattering mechanisms of the materials comprising the interface as opposed to the heat capacities of those materials. The model developed in this work assumes that a phonon on one side of an interface may not scatter at the interface itself but instead scatter...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. April 2011, 133(4): 042402.
Published Online: January 11, 2011
...Dhruv Singh; Jayathi Y. Murthy; Timothy S. Fisher Phonon transport across constrictions formed by a nanowire or a nanoparticle on a substrate is studied by a numerical solution of the gray Boltzmann transport equation (BTE) resolving the effects of two length scales that govern problems...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. February 2011, 133(2): 022403.
Published Online: November 3, 2010
... is approximately 600 W / m K at room temperature. While this value is lower than the reported basal plane values for graphite and suspended graphene because of phonon leakage across the graphene-support interface, it is still considerably higher than the values for common thin film electronic materials. Here, we...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. October 2010, 132(10): 101301.
Published Online: July 27, 2010
...T. J. Bright; Z. M. Zhang One of the approaches for micro/nanoscale heat transfer in semiconductors and dielectric materials is to use the Boltzmann transport equation, which reduces to the equation of phonon radiative transfer under the relaxation time approximation. Transfer and generation...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. October 2010, 132(10): 102401.
Published Online: July 23, 2010
... to solve the Boltzmann transport equation (BTE) for phonons using molecular dynamics (MD), including phonon relaxation times, dispersion relations, group velocities, and specific heat, (ii) applying quantum corrections to the MD results to make them suitable for the solution of BTE, and (iii) numerically...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. August 2010, 132(8): 082401.
Published Online: June 4, 2010
...Arvind Pattamatta; Cyrus K. Madnia Ultrashort-pulsed laser irradiation on semiconductors creates a thermal nonequilibrium between carriers and phonons. Previous computational studies used the “two-temperature” model and its variants to model this nonequilibrium. However, when the laser pulse...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. July 2010, 132(7): 072403.
Published Online: April 29, 2010
...Zeng-Yuan Guo; Quan-Wen Hou In times comparable to the characteristic time of the energy carriers, Fourier’s law of heat conduction breaks down and heat may propagate as waves. Based on the concept of thermomass, which is defined as the equivalent mass of phonon gas in dielectrics, according...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. November 2008, 130(11): 112401.
Published Online: September 3, 2008
... and theoretically presented. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, wherein each cavity supports a localized field that is attributed to coupled surface phonon polaritons. We show that it is possible to obtain a polarized quasimonochromatic...