Radiative heat transfer

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Radiative heat transfer

01 Jan 1993-

TL;DR: In this article, the Monte Carlo method for thermal radiation was used to estimate the radiative properties of one-dimensional Gray Media, and the method of Spherical Harmonics (PN-Approximation) was used for the same purpose.

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Abstract: 1. Fundamentals of Thermal Radiation 2. Radiative Property Predictions from Electromagnetic Wave Theory 3. Radiative Properties of Real Surfaces 4. View Factors 5. Radiative Exchange Between Gray, Diffuse Surfaces 6. Radiative Exchange Between Partially-Specular Gray Surfaces 7. Radiative Exchange Between Nonideal Surfaces 8. Surface Radiative Exchange in the Presence of Conduction and Convection 9. The Equation of Radiative Transfer in Participating Media 10. Radiative Properties of Molecular Gases 11. Radiative Properties of Particulate Media 12. Radiative Properties of Semitransparent Media 13. Exact Solutions for One-Dimensional Gray Media 14. Approximate Solution Methods for One-Dimensional Media 15. The Method of Spherical Harmonics (PN-Approximation) 16. The Method of Discrete Ordinates (SN-Approximation) 17. The Zonal Method 18. The Treatment of Collimated Irradiation 19. The Treatment of Nongray Extinction Coefficients 20. The Monte Carlo Method for Thermal Radiation 21. Radiation Combined with Conduction and Convection 22. Inverse Radiative Heat Transfer A. Constants and Conversion Factors B. Tables for Radiative Properties of Opaque Surfaces C. Blackbody Emissive Power Table D. View Factor Catalogue E. Exponential Integral Functions F. Computer Codes Author Index Subject Index

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Oxy-fuel combustion technology for coal-fired power generation

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Bart J P Buhre¹, Liza K. Elliott¹, Changdong Sheng¹, Rajender Gupta¹, Terry Wall¹ - Show less +1 more•Institutions (1)

University of Newcastle¹

01 Jan 2005-Progress in Energy and Combustion Science

TL;DR: A comprehensive review of CO2 capture in coal-fired combustion plants can be found in this article, where the status of the technology development and assessments providing comparisons with other power generation options, and suggests research needs.

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1,450 citations

Journal Article•DOI•

Medical applications of infrared thermography: A review.

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B.B. Lahiri¹, S. Bagavathiappan¹, T. Jayakumar¹, John Philip¹•Institutions (1)

Indira Gandhi Centre for Atomic Research¹

01 Jul 2012-Infrared Physics & Technology

TL;DR: The present efforts are focused on automatic analysis of temperature distribution of regions of interest and their statistical analysis for detection of abnormalities in the area of medical IRT.

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888 citations

Cites background from "Radiative heat transfer"

...(1)), which describes the total emissive power from a blackbody [12] ....
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...All objects with temperature above absolute zero emit electromagnetic radiation, which is known as infrared (i.e. below red) radiation or thermal radiation [4, 11, 12] ....
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...According to thermal radiation theory, blackbody is considered as a hypothetical object that absorbs all incident radiation and radiates a continuous spectrum according to Planck's law [12] ....
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...For medical applications a very narrow wavelength band (8) (9) (10) (11) (12) lm), termed as body infrared rays, is in general used [14] ....
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Journal Article•DOI•

Optical constants of silica glass from extreme ultraviolet to far infrared at near room temperature.

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Rei Kitamura¹, Laurent Pilon¹, Miroslaw Jonasz•Institutions (1)

University of California¹

20 Nov 2007-Applied Optics

TL;DR: New formulas providing comprehensive approximations of the optical properties of silica glass are proposed between 7 and 50 microm, which are consistent with experimental data and substantially extend the spectral range of 0.21-7 microm covered by existing formulas and can be used in various engineering applications.

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Abstract: We thoroughly and critically review studies reporting the real (refractive index) and imaginary (absorption index) parts of the complex refractive index of silica glass over the spectral range from 30 nm to 1000 μm The general features of the optical constants over the electromagnetic spectrum are relatively consistent throughout the literature In particular, silica glass is effectively opaque for wavelengths shorter than 200 nm and larger than 35-40 μm Strong absorption bands are observed (i) below 160 nm due to the interaction with electrons, absorption by impurities, and the presence of OH groups and point defects; (ii) at ~273-285, 35, and 43 μm also caused by OH groups; and (iii) at ~9-95, 125, and 21-23 μm due to SiOSi resonance modes of vibration However, the actual values of the refractive and absorption indices can vary significantly due to the glass manufacturing process, crystallinity, wavelength, and temperature and to the presence of impurities, point defects, inclusions, and bubbles, as well as to the experimental uncertainties and approximations in the retrieval methods Moreover, new formulas providing comprehensive approximations of the optical properties of silica glass are proposed between 7 and 50 μm These formulas are consistent with experimental data and substantially extend the spectral range of 021-7 μm covered by existing formulas and can be used in various engineering applications

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882 citations

Cites background or methods from "Radiative heat transfer"

...2(η) = 2′(η) + i2′′(η) = 2∞ + ∑ j [ g cj (η) + igcj(η) ] (21)...
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...The fitting curves obtained in this study are shown in Figures 3 and 4, and the associated parameters αj, η0j, and σj used in Equations (21) to (22) are summarized in Table 2....
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...By adding terms in Equation (21) one by one, eight terms were found to best fit the...
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...The practical procedure for fitting complex refractive index data conducted in this paper is as follows: (i) the spectral reflectivity at normal incidence, R(η), is computed from Equation (7), (ii) parameters of 2(η) in Equations (21) to (22) are determined by curve fitting for R(η) expressed as,...
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Journal Article•DOI•

Evolution and Modern Approaches for Thermal Analysis of Electrical Machines

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Aldo Boglietti, Andrea Cavagnino, David Staton, M. Shanel, Markus Mueller¹, C. Mejuto¹ - Show less +2 more•Institutions (1)

University of Edinburgh¹

27 Feb 2009-IEEE Transactions on Industrial Electronics

TL;DR: The improvements and the new techniques proposed in the last decade are analyzed in depth and compared in order to highlight the qualities and defects of each.

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Abstract: In this paper, the authors present an extended survey on the evolution and the modern approaches in the thermal analysis of electrical machines. The improvements and the new techniques proposed in the last decade are analyzed in depth and compared in order to highlight the qualities and defects of each. In particular, thermal analysis based on lumped-parameter thermal network, finite-element analysis, and computational fluid dynamics are considered in this paper. In addition, an overview of the problems linked to the thermal parameter determination and computation is proposed and discussed. Taking into account the aims of this paper, a detailed list of books and papers is reported in the references to help researchers interested in these topics.

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823 citations

Cites background from "Radiative heat transfer"

...are available to help with the calculation of the view factor [27], [28]....
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Journal Article•DOI•

Temperature decreases in an urban canyon due to green walls and green roofs in diverse climates

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Eleftheria Alexandri, Phillip John Jones¹•Institutions (1)

Cardiff University¹

01 Apr 2008-Building and Environment

TL;DR: In this article, the thermal effect of covering the building envelope with vegetation on the microclimate in the built environment, for various climates and urban canyon geometries, is discussed.

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803 citations