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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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Journal ArticleDOI
TL;DR: It is found that the heat transfer rate of the hybrid nanofluid is higher as compared to the traditional nan ofluid and the velocity and temperature distributions are decreasing functions of the slip parameter.
Abstract: The main object of the present paper is to examine and compare the improvement of flow and heat transfer characteristics between a rotating nanofluid and a newly discovered hybrid nanofluid in the presence of velocity slip and thermal slip. The influence of thermal radiation is also included in the present study. The system after applying the similarity transformations is solved numerically by using the bvp-4c scheme. Additionally, numerical calculations for the coefficient of skin friction and local Nusselt number are introduced and perused for germane parameters. The comparison between water, nanofluid and hybrid nanofluid on velocity and temperature is also visualized. It is observed that the velocity and temperature distributions are decreasing functions of the slip parameter. Temperature is boosted by thermal radiation and rotation. It is found that the heat transfer rate of the hybrid nanofluid is higher as compared to the traditional nanofluid.

154 citations

Journal ArticleDOI
TL;DR: In this article, an analytical expression for the near-field radiative heat flux between two layers of finite thicknesses in terms of film reflection and transmission coefficients is derived for the first time, showing the resonant modes of thermal emission, absorption and the cross-coupling of surface phonon-polaritons (SPhPs) between the layers.
Abstract: Spectral distributions of radiative heat flux between two thin silicon carbide films separated by sub-wavelength distances in vacuum are analysed. An analytical expression for the near-field flux between two layers of finite thicknesses in terms of film reflection and transmission coefficients is derived for the first time. The resulting equation clearly shows the resonant modes of thermal emission, absorption and the cross-coupling of surface phonon-polaritons (SPhPs) between the layers. When the films are of the same thickness, the resonant frequencies maximizing near-field thermal emission almost match those of absorption. The small discrepancies, due to SPhP coupling between the films, lead to loss of spectral coherence affecting mostly the low frequency mode. The flux profiles also show that splitting of the resonance into two distinct frequencies happens when the ratio thickness of the film over the separation gap is less than unity. When the thickness of one film increases relative to the other, spectral distributions of flux are significantly altered due to an important mismatch between the resonant frequencies of high emission and absorption. This modification of the near-field flux is mostly due to weaker SPhP coupling within the layer of increasing thickness. Based on an asymptotic analysis of the dispersion relation, an approximate approach is proposed to predict the resonant modes maximizing the flux between two films, which can be potentially extended to multiple thin layers. The outcome of this work would allow tailoring near-field radiative heat transfer, and can eventually be used to design customized nanostructures for energy harvesting applications.

153 citations

Journal ArticleDOI
TL;DR: In this article, a non-luminous turbulent jet diffusion flame is numerically simulated using a Reynolds stress second-order closure, the steady laminar flamelet model, and different approaches for radiative transfer.

153 citations

Journal ArticleDOI
TL;DR: A mathematical model will be analyzed in order to study the effects of thermal radiation on the laminar boundary layer about a flat-plate and it is found that a diminution in the thermal radiation’s effect occurs.

153 citations

01 Jan 1989
TL;DR: In this paper, the steps required to determine a radiometric diameter of an asteroid from observations of its visual and thermal radiation are described together with thermal models required to predict the emission expected from a body of given size and bolometric albedo.
Abstract: The steps required to determine a radiometric diameter of an asteroid from observations of its visual and thermal radiation are described together with thermal models required to predict the emission expected from a body of given size and bolometric albedo. It is pointed out, however, that, in some cases, these models were found to fail for a variety of reasons; in particular, they fail to characterize the shape, surface roughness, the rate and sense of rotation, and the maturity of the surface regolith, all of which affect the observed thermal flux. Several thermal models are examined, including the Standard Thermal Model for asteroids, the fast-rotating (isothermal-latitude) model, the thermophysical model, and the rough-surface thermophysical models.

152 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023375
2022749
2021575
2020636
2019663
2018618