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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: In this paper, a Monte Carlo method for radiative heat transfer has been incorporated in CFD modeling of buoyant turbulent diffusion flames in stagnant air and in a cross-wind.

124 citations

Journal ArticleDOI
TL;DR: In this article, a flow of magnetite nanoliquid by nonlinear stretching sheet is considered and the velocity, temperature, entropy generation, Bejan number, skin friction and heat transfer rate are discussed.

124 citations

Journal ArticleDOI
TL;DR: In this article, the Monte Carlo Ray-Trace (MCRT) method was applied to radiation in a Participating Medium, and the distribution factor for Nondiffuse, Nongray, Surface-to-Surface Radiation.
Abstract: Preface. Acknowledgments. FUNDAMENTALS OF THERMAL RADIATION. Introduction to Thermal Radiation. Basic Concepts the Blackbody. Description of Real Surfaces Surface Properties. Radiation Behavior of Surfaces. Wave Phenomena in Thermal Radiation. Radiation in a Participating Medium. TRADITIONAL METHODS OF RADIATION HEAT TRANSFER ANALYSIS. Solution of the Equation of Radiative Transfer. The Net Exchange Formulation for Diffuse, Gray Enclosures. Evaluation of Configuration Factors. Radiative Analysis of Nondiffuse, Nongray Surfaces Using the Net Exchange Formulation. THE MONTE CARLO RAY-TRACE (MCRT) METHOD. Introduction to the Monte Carlo Ray-Trace (MCRT) Method. The MCRT Method for Diffuse-Specular, Gray Enclosures: An Extended Example. The Distribution Factor for Nondiffuse, Nongray, Surface-to-Surface Radiation. The MCRT Method Applied to Radiation in a Participating Medium. Statistical Estimation of Uncertainty in the MCRT Method. Appendix A: Radiation from an Atomic Dipole. Appendix B: Mie Scattering by Homogeneous Spherical Particles: Program UNO. Appendix C: A Functional Environment for Longwave Infrared Exchange (FELIX). Appendix D: Random Number Generators and Autoregression Analysis. Index.

123 citations

Journal ArticleDOI
TL;DR: In this paper, the authors calculate numerically the emitter-collector gaps that maximize the power conversion efficiency of vacuum thermionic energy converters (TECs), and show that the optimal gap ranges from 900nm to 3μm.
Abstract: In this letter, we calculate numerically the emitter-collector gaps that maximize the power conversion efficiency of vacuum thermionic energy converters (TECs). The optimum arises because efficiency drops both at very large gaps, due to space-charge limitations on the TEC current, and at very small gaps, due to the increased parasitic heat loss via near-field radiative heat transfer. For typical TECs made with cesiated tungsten electrodes, the optimal gaps range from 900 nm to 3 μm and are approximately equal to the characteristic wavelength of the emitter thermal radiation, as given by Wien’s displacement law.

123 citations

Journal ArticleDOI
TL;DR: In this article, a different application of Rosseland approximation for thermal radiation is introduced in the two-dimensional stagnation-point flow of viscous nanofluid due to solar energy.
Abstract: Radiation effects in the two-dimensional stagnation-point flow of viscous nanofluid due to solar energy are investigated. Heat transfer subject to thermal radiation, Joule heating, viscous dissipation and convective boundary conditions is considered. A different application of Rosseland approximation for thermal radiation is introduced in this study. The governing equations are simplified through the boundary layer assumptions and then transformed into non-dimensional forms by appropriate transformations. The resulting differential systems are solved numerically through fourth-fifth order Runge–Kutta method (RK45) using a shooting technique. The influences of different parameters are explained through graphs for velocity, temperature and concentration and numerical values of local Nusselt and Sherwood numbers. A comparative analysis of the solutions is performed through previous studies in some limiting cases. Both the temperature and wall temperature gradient are increasing functions of the radiation parameter. The excessive movement of nanoparticles in the base fluids results in the deeper absorption of solar radiations in the liquids.

123 citations


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