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, a global thermal model of the energy conversion of the 10kW el Eurodish dish/Stirling unit erected at the CNRS-PROMES laboratory in Odeillo is presented.
105 citations
TL;DR: In this paper, the effect of radiation and natural convection in a saturated porous medium embedded in a vertical annular cylinder has been investigated, and the influence of aspect ratio (A) and radius ratio (R) on Nusselt number is presented.
105 citations
TL;DR: In this paper, a thermal conductivity model of nanofluids involving static and dynamic approach is considered, which signifies hydrodynamic interaction among the Brownian motion induced fluid particles.
Abstract: Background Characterised with augmented heat transport and thermal efficiency, nanofluids are implementable in diversified applications include pharmaceutical industries, hybrid-powered machines, cooling of different appliances, refrigerator, microelectronic, heat exchanger etc. Taking such advantages into mind, physical aspects of entropy optimization and non-linear thermal radiation in Darchy–Forchheimer flow of copper–water nanofluid due to a rotating disk are examined. A new thermal conductivity model of nanofluids involving static and dynamic approach is considered. This model signifies hydrodynamic interaction among the Brownian motion induced fluid particles. The Cattaneo–Christov heat flux theory is taken into account. The second law of thermodynamics is the instrumental for the determination of total entropy generation rate. Methods The system of nonlinear PDEs is converted into system of nonlinear ODEs through favorable transformations. Shooting technique has been applied prospectively to accomplish the desired numerical solution of the transformed equations. Results The behavior of velocity (axial, transverse and tangential) and thermal fields influenced by varied physical parameters is impressed through graphs and numerical tables. Velocity field peters out due to rising porosity parameter as well as volume fraction while thermal field upgrades for higher Biot number and radiation parameter. Significant heat transfer rate is obtained for smaller estimation of radiation parameter. Entropy generation rate and Bejan number exhibit similar trend for radiation parameter and opposite fashion for Reynolds number. Conclusions The diminishing velocity distribution for larger access of porous matrix while elevated temperature distribution for higher temperature parameter (due to nonlinear thermal radiation). Entropy minimization is accomplished for grater estimation of Brinkman and Reynolds numbers.
105 citations
TL;DR: In this paper, the authors developed the concept of entransy flux for thermal radiation in enclosures with opaque surfaces and developed the extremum entransys dissipation principles (EEDP) and the minimum thermal resistance principle (MTRP) to optimize some radiative heat transfer problems, and a comparison is made between the minimum principle of entropy generation and the EEDP.
104 citations
TL;DR: It is shown that a photonic crystal film can emit coherent thermal radiation and the frequency and direction of emission depend on the lattice parameters, paving the way towards the design of coherent infrared antennas.
Abstract: We show that a photonic crystal film can emit coherent thermal radiation. We demonstrate the key role of leaky waves existing at the air-photonic crystal interface. The frequency and direction of emission depend on the lattice parameters. This paves the way towards the design of coherent infrared antennas.
104 citations