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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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Book ChapterDOI
01 Jan 2011
TL;DR: In this paper, the authors provide an insight into the different aspects of heat transfer in aerogels and their thermal properties, and the principle heat transfer mechanisms are discussed and illustrated by exemplary experimental results.
Abstract: This chapter provides an insight into the different aspects of heat transfer in aerogels and their thermal properties. In this context, the principle heat transfer mechanisms are discussed and illustrated by exemplary experimental results. Typical thermal conductivity values and radiative properties as well as their dependency on external conditions such as temperature or atmosphere are discussed for different classes of aerogels. The chapter concludes with a brief discussion about the specific heat of aerogels.

66 citations

Journal ArticleDOI
TL;DR: In this paper, the authors extended the Monte-Carlo method to calculate radiation in enclosures containing obstacles of very small thickness, and employed the discrete transfer, the discrete ordinates and the finite volume method to predict the heat transfer in two-dimensional enclosures.

66 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the problem of MHD boundary layer flow and heat transfer of an electrically conducting dusty fluid over an unsteady stretching surface through a non-Darcy porous medium.

66 citations

Journal ArticleDOI
TL;DR: In this article, a novel way to harvest waste heat by combining pyroelectric energy conversion and nanoscale thermal radiation was explored, and a new device was investigated numerically by accurately modeling radiative heat transfer between an element and hot and cold plates.
Abstract: Pyroelectric energy conversion offers a way to convert waste heat directly into electricity. It makes use of the pyroelectric effect to create a flow of charge to or from the surface of a material as a result of heating or cooling. However, existing pyroelectric energy converter can only operate at low frequency due to relatively small convective heat transfer rate between the pyroelectric materials and the working fluid. On the other hand, energy transfer by thermal radiation between two semi-infinite solids is nearly instantaneous and can be enhanced by several orders of magnitude from the conventional Stefan-Boltzmann law as the gap separating them becomes smaller than the Wien's displacement wavelength. This paper explores a novel way to harvest waste heat by combining pyroelectric energy conversion and nanoscale thermal radiation. A new device was investigated numerically by accurately modeling nanoscale radiative heat transfer between a pyroelectric element and hot and cold plates. Silica absorbing layers on top of every surface were used to further increase the net radiative heat fluxes. Temperature oscillations with time and performances of the pyroelectric converter were predicted at various frequencies. The device using 60/40 P(VDF-TrFE) achieved 0.2% efficiency and 0.84 mW/cm2 electrical power output for the cold and hot sources at 273 and 388 K, respectively. Better performances could be achieved with 0.9PMN-PT namely efficiency of 1.3% and power output of 6.5 mW/cm2 between the cold and hot sources at 283 and 383 K, respectively. These results are compared with alternative technologies and suggestions are made to further improve the device.

66 citations

Journal ArticleDOI
TL;DR: In this article, the heat transfer to a wafer in a rapid thermal processing (RTP) furnace is simulated by an analytical/numerical model, which includes radiation heat transfer from lamps, heat conduction within the wafer, and emission of radiation from the Wafer.
Abstract: The heat transfer to a wafer in a rapid thermal processing (RTP) furnace is simulated by an analytical/numerical model. The model includes radiation heat transfer to the wafer from the lamps, heat conduction within the wafer, and emission of radiation from the wafer. Geometric optics are used to predict the radiant heat flux distribution over the wafer. The predicted wafer surface temperature distribution is compared to measurements made in an RTP furnace for two different reflector geometries. Lamp configurations and the resulting irradiance required to produce a uniform wafer temperature are defined. >

66 citations


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