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Geometrical quasi-ballistic effects on thermal transport in nanostructured devices

Nano Research 2021年第4期14卷 945-952页

作者： Sami Alajlouni Albert Beardo Lluc Sendra Amirkoushyar Ziabari Javier Bafaluy Juan Camacho Yi Xuan F.Xavier Alvarez Ali Shakouri Birck Nanotechnology Center Purdue UniversityWest LafayetteIndiana 47907USA Department of electrical and computer engineering Purdue UniversityWest LafayetteIndiana 47907USA Department of physics Universitat Autonoma de BarcelonaBellaterra 08193CataloniaSpain Oak Ridge National Laboratory Oak RidgeTennessee 37831USA R&D Staff Scientist ImagingSignals and Machine LearningTennessee 37831USA

We employ thermoreflectance thermal imaging to directly measure the steady-state two-dimensional(2D)temperature field generated by nanostructured heat sources deposited on silicon substrate with different geometrical configurations and characteristic sizes down to *** analysis of the results using Fourier's law not only breaks down as size scales down,but it alsofails to capture the impact of the geometry of the heat *** substrate effective Fourier thermal conductivities fitted to wire-shaped and circular-shaped structures with identical characteristic lengths are found to display up to 40%***,a hydrcxjynamic heat transport model reproduces the observed temperature fields for all device sizes and shapes using just intrinsic Si parameters,i.e.,a geometry and size-independent thermal conductivity and nonlocal length *** hydrodynamic model provides insight into the observed thermal response and of the contradictory Fourier *** discuss the substantial Silicon hydrodynamic behavior at room temperature and contrast it to InGaAs,which shows less hydrodynamic effects due to dominant phonon-impurity scattering.

关键词： phonon hydrodynamics nanoscale heat transfer quasi-ballistic transport silicon

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The lattice Boltzmann Peierls Callaway equation for mesoscopic thermal transport modeling

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International Journal of Smart and Nano Materials 2012年第1期3卷 47-63页

作者： Jonghoon Lee Sangwook Sihn Ajit K.Roy Barry L.Farmer Thermal Sciences and Materials Branch Materials and Manufacturing DirectorateAir Force Research LaboratoryWright Patterson Air Force BaseOhio 45433USA Universal Technology Corporation 1270 N.Fairfield Rd.DaytonOH 45432USA University of Dayton Research Institute 300 College ParkDaytonOhio 45469USA Materials and Manufacturing Directorate Air Force Research LaboratoryWright Patterson Air Force BaseOhio 45433USA

The lattice Boltzmann Peierls Callaway(LBPC)method is a recent development of the versatile lattice Boltzmann formalism aimed at a numerical experiment on mesoscale thermal transport in a multiphase phonon *** aspects of mesoscopic thermal trans-port are discussed:the finite phonon mean free path and the interface thermal *** on the phonon momentum screening length measured in the LBPC computa-tional apparatus,the validity of the Umklapp collision relaxation time in the Callaway collision operator is examined *** discrete nature of the spatio-temporal domain in the LBPC method,along with the linear approximation of the exponential screening mechanism in the Callaway operator,reveals a large discrepancy between the effective phonon mean free path and the analytic phonon mean free path when the relaxation time is *** link bounce back interface phonon collision rule is used to realize the interface thermal resistance between phonon gases with dissimilar dispersion *** with the Callaway collision operator for the bulk phonon dynam-ics,the interface phonon collision process is regarded as a linear relaxation mechanism toward the local pseudo-equilibrium phonon distribution uniquely defined by the energy conservation *** interface thermal resistance is linearly proportional to the relaxation time of the proposed phonon interface collision rule.

关键词： lattice Boltzmann method link bounce back collision rule Boltzmann Peierls equation phonon hydrodynamics Kapitza length interfacial thermal resistance

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