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: It is found that velocity of the fluid diminishes for large values of magnetic parameter and porosity parameter, whereas thermal slip parameter shows converse effect and chemical reaction parameter significantly enhances the nanoparticle concentration profile.
Abstract: In this article, we have examined three-dimensional unsteady MHD boundary layer flow of viscous nanofluid having gyrotactic microorganisms through a stretching porous cylinder. Simultaneous effects of nonlinear thermal radiation and chemical reaction are taken into account. Moreover, the effects of velocity slip and thermal slip are also considered. The governing flow problem is modelled by means of similarity transformation variables with their relevant boundary conditions. The obtained reduced highly nonlinear coupled ordinary differential equations are solved numerically by means of nonlinear shooting technique. The effects of all the governing parameters are discussed for velocity profile, temperature profile, nanoparticle concentration profile and motile microorganisms' density function presented with the help of tables and graphs. The numerical comparison is also presented with the existing published results as a special case of our study. It is found that velocity of the fluid diminishes for large values of magnetic parameter and porosity parameter. Radiation effects show an increment in the temperature profile, whereas thermal slip parameter shows converse effect. Furthermore, it is also observed that chemical reaction parameter significantly enhances the nanoparticle concentration profile. The present study is also applicable in bio-nano-polymer process and in different industrial process.
117 citations
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TL;DR: Theoretical stationary and transient temperature rises are calculated using Fourier and Laplace transformations as discussed by the authors, where the effects of inhomogeneous heat flow to a submount and heat radiation from the diode surface into the ambient atmosphere are taken into account in the calculation.
Abstract: Numerical analyses and experimental results on thermal behavior of AlGaAs laser diodes for CW and modulated operations are presented. Theoretical stationary and transient temperature rises are calculated using Fourier and Laplace transformations. Effects of inhomogeneous heat flow to a submount and heat radiation from the diode surface into the ambient atmosphere are taken into account in the calculation. Thermal resistances of laser arrays are also discussed. Experimental temperature behavior at the active layer is obtained from the wavelength shift measurement of an oscillation mode using a birefringent filter, which provides fast and precise measurement. Three components of temperature rise are observed in step and periodic responses. Numerical and experimental results are in good agreement.
116 citations
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TL;DR: In this paper, a triple layer structure was proposed by sandwiching a dielectric SiO2 layer between two Ag metal films on the Si substrate, and the top Ag layer was perforated by periodic holes.
Abstract: The blackbody radiation spectrum is fundamental to any thermal emitter. However, by properly designing the emitter structure, a narrow bandwidth and high power infrared source can be achieved. This invention consists of a triple layer structure by sandwiching a dielectric SiO2 layer between two Ag metal films on the Si substrate. The top Ag layer is perforated by periodic holes. When the device was heated, the background thermal radiation was suppressed by the bottom Ag whose emissivity is very low. The thermal radiation generated in the SiO2 layer resonant between two metal films and the Ag∕SiO2 and the Ag/air surface plasmon polaritons are induced and converted to light radiation. Strong resonance at Ag∕SiO2 (1,0) degenerate modes results in the coherent light radiation at the wavelength associated with the dielectric constant of SiO2 and the lattice constant of the perforated hole array. The ratio of the full width at half maximum to the peak wavelength is 0.114. This narrow bandwidth and high power infrared light source can be used to explore the biological response of cells and plants.
116 citations
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27 Mar 1997TL;DR: In this article, a bi-material strip is composed of two materials with a large difference in thermal expansion coefficients, and each strip changes position of one plate of a sensing capacitor in response to temperature changes due to absorbed incident thermal radiation.
Abstract: An infrared imager includes an array of capacitance sensors that operate at room temperature. Each infrared capacitance sensor includes a deflectable first plate which expands due to absorbed thermal radiation relative to a non-deflectable second plate. In one embodiment each infrared capacitance sensor is composed of a bi-material strip which changes the position of one plate of a sensing capacitor in response to temperature changes due to absorbed incident thermal radiation. The bi-material strip is composed of two materials with a large difference in thermal expansion coefficients.
116 citations
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TL;DR: Experimental studies of solar radiation on a frequency of 200 Mcyc/sec are described in this article, which has characteristics similar to those of thermal radiation but is always hundreds of times greater than the thermal radiation anticipated from the photosphere and sometimes greater by a factor of 104.
Abstract: Experimental studies of solar radiation on a frequency of 200 Mcyc./sec. are described. This radiation has characteristics similar to those of thermal radiation but is always hundreds of times greater than the thermal radiation anticipated from the photosphere and sometimes greater by a factor of 104.
115 citations