Topic
Thermal radiation
About: Thermal radiation is a research topic. Over the lifetime, 12290 publications have been published within this topic receiving 197186 citations. The topic is also known as: heat radiation.
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TL;DR: In this paper, the authors investigated the thermal emission from magnetic neutron star surfaces in which the cohesive effects of the magnetic field have produced the condensation of the atmosphere and the external layers.
Abstract: We investigate the thermal emission from magnetic neutron star surfaces in which the cohesive effects of the magnetic field have produced the condensation of the atmosphere and the external layers. This may happen for sufficiently cool (T ≤ 10 6 ) atmospheres with moderately intense magnetic fields (about 10 13 G for Fe atmospheres). The thermal emission from an isothermal bare surface of a neutron star shows no remarkable spectral features, but it is significantly depressed at energies below some threshold energy. However, since the thermal conductivity is very different in the normal and parallel directions to the magnetic field lines, the presence of the magnetic field is expected to produce a highly anisotropic temperature distribution, depending on the magnetic field geometry. In this case the observed flux of such an object looks very similar to a BB spectrum, but depressed by a nearly constant factor at all energies. This results in a systematic underestimation of the area of the emitter (and therefore its size) by a factor 5-10 (2-3).
52 citations
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TL;DR: In this article, the flow and heat transfer of an incompressible Ostwald de-Waele power-law fluid past an infinite porous plate, subject to suction at the plate, was studied.
Abstract: This paper presents a study of the flow and heat transfer of an incompressible Ostwald de-Waele power-law fluid past an infinite porous plate, subject to suction at the plate. The power-law index n satisfies 0 n
52 citations
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TL;DR: In this paper, the effect of interaction of surface radiation on natural convection and surface radiation heat transfer from side-vented open cavities with top opening has been studied for different aspect ratios, surface emissivities and side-vents, using air as the medium.
52 citations
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TL;DR: In this article, the effects of spatially varying absorption and scattering coefficients on radiation transfer in absorbing, emitting, anisotropic scattering, hollow solid spheres or a plane-parallel slab with reflecting boundaries have been investigated.
Abstract: The effects of spatially-varying absorption and scattering coefficients on radiation transfer in absorbing, emitting, anisotropically scattering, hollow solid spheres or a plane-parallel slab with reflecting boundaries have been investigated. Tabulated results are presented for the hemispherical reflectivity and transmissivity, the exit intensity and the net radiation heat flux. Our present solutions show excellent agreement with available special cases reported in the literature.
52 citations
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TL;DR: It is demonstrated that emissivity and absorptivity are equal, by showing that such photonic crystal systems emit as much radiation as they absorb, for every frequency, up to statistical fluctuations.
Abstract: We perform direct thermal emission calculations for three-dimensionally periodic photonic crystal slabs using stochastic electrodynamics following the Langevin approach, implemented via a finite-difference time-domain algorithm. We demonstrate that emissivity and absorptivity are equal, by showing that such photonic crystal systems emit as much radiation as they absorb, for every frequency, up to statistical fluctuations. We also study the effect of surface termination on absorption and emission spectra from these systems.
52 citations