The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Alejandro W. Rodriguez - One of the best experts on this subject based on the ideXlab platform.

  • Fundamental limits to radiative Heat Transfer: Theory
    Physical Review B, 2020
    Co-Authors: Sean Molesky, Prashanth S. Venkataram, Weiliang Jin, Alejandro W. Rodriguez
    Abstract:

    Radiative Heat Transfer between bodies at the nanoscale can surpass blackbody limits on thermal radiation by orders of magnitude due to contributions from evanescent electromagnetic fields, which carry no energy to the far field. Thus far, principles guiding explorations of larger Heat Transfer beyond planar structures have assumed utility in surface nanostructuring, via enhancement of the density of states, and the possibility that such design paradigms can approach Landauer limits, in analogy to conduction. Here we derive fundamental shape-independent limits to radiative Heat Transfer, applicable in near- through far-field regimes, that incorporate material and geometric constraints such as intrinsic dissipation and finite object sizes, and show that these preclude reaching the Landauer limits in all but a few restrictive scenarios. Additionally, we show that the interplay of material response and electromagnetic scattering among proximate bodies means that bodies which maximize radiative Heat Transfer actually maximize scattering rather than absorption. Finally, we compare our new bounds to Landauer limits as well as limits that ignore the interplay between material and geometric constraints, and show that these prior limits lead to overly optimistic predictions. Our results have ramifications for the ultimate performance of thermophotovoltaics and nanoscale cooling, as well as incandescent and luminescent devices.

  • Fluctuating-surface-current formulation of radiative Heat Transfer: Theory and applications
    Physical Review B, 2013
    Co-Authors: Alejandro W. Rodriguez, M. T. Homer Reid, Steven G. Johnson
    Abstract:

    We describe a novel fluctuating-surface current formulation of radiative Heat Transfer between bodies of arbitrary shape that exploits efficient and sophisticated techniques from the surface-integral-equation formulation of classical electromagnetic scattering. Unlike previous approaches to non-equilibrium fluctuations that involve scattering matrices---relating "incoming" and "outgoing" waves from each body---our approach is formulated in terms of "unknown" surface currents, laying at the surfaces of the bodies, that need not satisfy any wave equation. We show that our formulation can be applied as a spectral method to obtain fast-converging semi-analytical formulas in high-symmetry geometries using specialized spectral bases that conform to the surfaces of the bodies (e.g. Fourier series for planar bodies or spherical harmonics for spherical bodies), and can also be employed as a numerical method by exploiting the generality of surface meshes/grids to obtain results in more complicated geometries (e.g. interleaved bodies as well as bodies with sharp corners). In particular, our formalism allows direct application of the boundary-element method, a robust and powerful numerical implementation of the surface-integral formulation of classical electromagnetism, which we use to obtain results in new geometries, including the Heat Transfer between finite slabs, cylinders, and cones.

  • Fluctuating surface-current formulation of radiative Heat Transfer: Theory and applications
    Physical Review Letters, 2013
    Co-Authors: Alejandro W. Rodriguez, Steven G. Johnson, M. T. Homer Reid
    Abstract:

    We describe a fluctuating-surface current formulation of radiative Heat Transfer between bodies of arbitrary shape that exploits efficient and sophisticated techniques from the surface-integral-equation formulation of classical electromagnetic scattering. Unlike previous approaches to nonequilibrium fluctuations that involve scattering matrices—relating “incoming” and “outgoing” waves from each body—our approach is formulated in terms of “unknown” surface currents, laying at the surfaces of the bodies, that need not satisfy any wave equation. We show that our formulation can be applied as a spectral method to obtain fast-converging semianalytical formulas in high-symmetry geometries using specialized spectral bases that conform to the surfaces of the bodies (e.g., Fourier series for planar bodies or spherical harmonics for spherical bodies), and can also be employed as a numerical method by exploiting the generality of surface meshes/grids to obtain results in more complicated geometries (e.g., interleaved bodies as well as bodies with sharp corners). In particular, our formalism allows direct application of the boundary-element method, a robust and powerful numerical implementation of the surface-integral formulation of classical electromagnetism, which we use to obtain results in new geometries, such as the Heat Transfer between finite slabs, cylinders, and cones.

M. T. Homer Reid - One of the best experts on this subject based on the ideXlab platform.

  • Fluctuating-surface-current formulation of radiative Heat Transfer: Theory and applications
    Physical Review B, 2013
    Co-Authors: Alejandro W. Rodriguez, M. T. Homer Reid, Steven G. Johnson
    Abstract:

    We describe a novel fluctuating-surface current formulation of radiative Heat Transfer between bodies of arbitrary shape that exploits efficient and sophisticated techniques from the surface-integral-equation formulation of classical electromagnetic scattering. Unlike previous approaches to non-equilibrium fluctuations that involve scattering matrices---relating "incoming" and "outgoing" waves from each body---our approach is formulated in terms of "unknown" surface currents, laying at the surfaces of the bodies, that need not satisfy any wave equation. We show that our formulation can be applied as a spectral method to obtain fast-converging semi-analytical formulas in high-symmetry geometries using specialized spectral bases that conform to the surfaces of the bodies (e.g. Fourier series for planar bodies or spherical harmonics for spherical bodies), and can also be employed as a numerical method by exploiting the generality of surface meshes/grids to obtain results in more complicated geometries (e.g. interleaved bodies as well as bodies with sharp corners). In particular, our formalism allows direct application of the boundary-element method, a robust and powerful numerical implementation of the surface-integral formulation of classical electromagnetism, which we use to obtain results in new geometries, including the Heat Transfer between finite slabs, cylinders, and cones.

  • Fluctuating surface-current formulation of radiative Heat Transfer: Theory and applications
    Physical Review Letters, 2013
    Co-Authors: Alejandro W. Rodriguez, Steven G. Johnson, M. T. Homer Reid
    Abstract:

    We describe a fluctuating-surface current formulation of radiative Heat Transfer between bodies of arbitrary shape that exploits efficient and sophisticated techniques from the surface-integral-equation formulation of classical electromagnetic scattering. Unlike previous approaches to nonequilibrium fluctuations that involve scattering matrices—relating “incoming” and “outgoing” waves from each body—our approach is formulated in terms of “unknown” surface currents, laying at the surfaces of the bodies, that need not satisfy any wave equation. We show that our formulation can be applied as a spectral method to obtain fast-converging semianalytical formulas in high-symmetry geometries using specialized spectral bases that conform to the surfaces of the bodies (e.g., Fourier series for planar bodies or spherical harmonics for spherical bodies), and can also be employed as a numerical method by exploiting the generality of surface meshes/grids to obtain results in more complicated geometries (e.g., interleaved bodies as well as bodies with sharp corners). In particular, our formalism allows direct application of the boundary-element method, a robust and powerful numerical implementation of the surface-integral formulation of classical electromagnetism, which we use to obtain results in new geometries, such as the Heat Transfer between finite slabs, cylinders, and cones.

Steven G. Johnson - One of the best experts on this subject based on the ideXlab platform.

  • Fluctuating-surface-current formulation of radiative Heat Transfer: Theory and applications
    Physical Review B, 2013
    Co-Authors: Alejandro W. Rodriguez, M. T. Homer Reid, Steven G. Johnson
    Abstract:

    We describe a novel fluctuating-surface current formulation of radiative Heat Transfer between bodies of arbitrary shape that exploits efficient and sophisticated techniques from the surface-integral-equation formulation of classical electromagnetic scattering. Unlike previous approaches to non-equilibrium fluctuations that involve scattering matrices---relating "incoming" and "outgoing" waves from each body---our approach is formulated in terms of "unknown" surface currents, laying at the surfaces of the bodies, that need not satisfy any wave equation. We show that our formulation can be applied as a spectral method to obtain fast-converging semi-analytical formulas in high-symmetry geometries using specialized spectral bases that conform to the surfaces of the bodies (e.g. Fourier series for planar bodies or spherical harmonics for spherical bodies), and can also be employed as a numerical method by exploiting the generality of surface meshes/grids to obtain results in more complicated geometries (e.g. interleaved bodies as well as bodies with sharp corners). In particular, our formalism allows direct application of the boundary-element method, a robust and powerful numerical implementation of the surface-integral formulation of classical electromagnetism, which we use to obtain results in new geometries, including the Heat Transfer between finite slabs, cylinders, and cones.

  • Fluctuating surface-current formulation of radiative Heat Transfer: Theory and applications
    Physical Review Letters, 2013
    Co-Authors: Alejandro W. Rodriguez, Steven G. Johnson, M. T. Homer Reid
    Abstract:

    We describe a fluctuating-surface current formulation of radiative Heat Transfer between bodies of arbitrary shape that exploits efficient and sophisticated techniques from the surface-integral-equation formulation of classical electromagnetic scattering. Unlike previous approaches to nonequilibrium fluctuations that involve scattering matrices—relating “incoming” and “outgoing” waves from each body—our approach is formulated in terms of “unknown” surface currents, laying at the surfaces of the bodies, that need not satisfy any wave equation. We show that our formulation can be applied as a spectral method to obtain fast-converging semianalytical formulas in high-symmetry geometries using specialized spectral bases that conform to the surfaces of the bodies (e.g., Fourier series for planar bodies or spherical harmonics for spherical bodies), and can also be employed as a numerical method by exploiting the generality of surface meshes/grids to obtain results in more complicated geometries (e.g., interleaved bodies as well as bodies with sharp corners). In particular, our formalism allows direct application of the boundary-element method, a robust and powerful numerical implementation of the surface-integral formulation of classical electromagnetism, which we use to obtain results in new geometries, such as the Heat Transfer between finite slabs, cylinders, and cones.

Shang Jianli - One of the best experts on this subject based on the ideXlab platform.

  • research on the thermal storage and Heat release system in sandwich wall phase change insulation layer
    Bulletin of the Chinese ceramic society, 2009
    Co-Authors: Shang Jianli
    Abstract:

    According to the technology of thermal storage and the characteristics of energy-saving wall,a new vision of Sandwich composite wall was proposed.By this vision,phase change materials worked as Heat-driven source,setting of materials,construction,building as a whole.And based on the Heat Transfer Theory,the process of laminated phase change materials which release Heat in winter,storage thermal in summer was analysed.The result shows that the complex system have double effect on self-thermostat and energy-saving.

Cai Hongnian - One of the best experts on this subject based on the ideXlab platform.

  • calculation of camouflage screen s thermal ir radiation temperature
    Laser & Infrared, 2007
    Co-Authors: Cai Hongnian
    Abstract:

    In this article,an indoor test model and an outdoor model of camouflage screen are established.The calculation methods for figuring out the thermal IR radiation temperature of the models are introduced.The methods derived from Heat Transfer Theory are more reasonable than the former equation.The indoor test model is suitable for camouflage screen′s emissivity test.The outdoor model is helpful to camouflage screen design and camouflage efficiency predicting.