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Journal articles on the topic 'Flux radiatif'

Author: Grafiati

Published: 20 January 2023

Last updated: 31 July 2025

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1

Singh, Bhawan, and Richard Taillefer. "Le bilan énergétique et le gel au sol : une analyse statistique." Géographie physique et Quaternaire 38, no. 2 (2007): 135–47. http://dx.doi.org/10.7202/032548ar.

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RÉSUMÉ Des mesures régulières détaillées des composantes du bilan radiatif et énergétique et des régimes thermiques et hydrique du sol jusqu'à 5 m de profondeur ont été prises entre les mois d'août 1979 et août 1980 dans une forêt de pins près du lac Hélène, Jamésie. Les analyses statistiques faites sur ces mesures indiquent que la température du sol et, par conséquent, le gel à l'intérieur du sol s'expliquent par les échanges d'énergie radiative et calorifique près de la surface et par l'accumulation de la neige sur la surface. Pour des périodes de temps choisies, les températures du sol sont

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2

Tsoy, Alexandr, Alexandr Granovskiy, Dmitriy Koretskiy, et al. "Experimental Study of the Heat Flow and Energy Consumption during Liquid Cooling Due to Radiative Heat Transfer in Winter." Energies 16, no. 13 (2023): 4865. http://dx.doi.org/10.3390/en16134865.

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Radiation cooling is a passive energy saving cooling technology. The process of cooling heat transfer liquid due to the combined effect of night radiative cooling and convection of air at negative temperatures (in winter) is studied. The radiator used for cooling was built into the roof of the building. Its radiating plate was made of a steel sheet coated with zinc oxide. In it, heat dissipation was carried out both from the upper and lower sides of the radiating plate. The experimental values of the heat flux ranged from 20 to 80 W·m−2 at a temperature difference between heat transfer liquid

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Cantat, Olivier, and Alexandre Follin. "Les singularités thermiques d’un espace périurbain dans une agglomération de dimension moyenne : le cas de Caen durant l’hiver 2018/2019." Climatologie 17 (2020): 3. http://dx.doi.org/10.1051/climat/202017003.

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L’analyse comparative des données météorologiques de la station rurale de Carpiquet avec une station expérimentale en périphérie de la ville de Caen a permis de montrer la présence en hiver d’un léger îlot de chaleur péri-urbain (ICPU) (moyenne de +0,4°C). Il est caractérisé par un maximum d’intensité en fin d’après-midi et début de soirée (+0,8°C) et des écarts faibles le reste du temps. Derrière cette image moyenne, une analyse du continuum temporel au pas de temps journalier puis horaire a mis en exergue des comportements différenciés selon les types de temps. Le caractère le plus original

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4

Pomraning, G. C. "Multimode flux-limited diffusion theory." Laser and Particle Beams 10, no. 2 (1992): 239–51. http://dx.doi.org/10.1017/s0263034600004389.

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We present a diffusion approximation describing the flow of thermal radiation that preserves several important features of the underlying equation of radiative transfer. Specifically, this diffusion description: (1) is flux limited; (2) reduces to the correct transport weak gradient limit; (3) allows correct and simultaneous exponential growth and Decay for a certain class of problems; (4) gives correct transport results for certain contiguous half-space problems; and (5) allows the radiative flux and the gradient of the radiation energy density to point in independent directions. This treatme

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Redko, A.A., N.V. Kulikova, a. Yu.A. Burd, S.V. Pavlovsky, O.F. Redko, and Yu.A. Pivnenko. "Numerical Analysis of Parameters of the Radiant Heating System with Radiating Panels." Problemele Energeticii Regionale 1(45) (January 15, 2020): 59–70. https://doi.org/10.5281/zenodo.3713405.

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The main goal of the work is to study radiation and convection heat-exchange in a closed volume of a panel radiator to assess the possibility of transferring short-wave radiation in the working area to a comfortable long-wave one. The goals have been achieved through the use of a mathematical model of three-dimensional unsteady flow and complex heat exchange in a radiant heating system, in which the system of Reynolds-averaged Navier – Stokes equations is added, supplemented by the radiative transfer equation. The effect of the shape and size of the panel, surface material and the presen

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Perovich, Donald K. "Sunlight, clouds, sea ice, albedo, and the radiative budget: the umbrella versus the blanket." Cryosphere 12, no. 6 (2018): 2159–65. http://dx.doi.org/10.5194/tc-12-2159-2018.

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Abstract. The surface radiation budget of the Arctic Ocean plays a central role in summer ice melt and is governed by clouds and surface albedo. I calculated the net radiation flux for a range of albedos under sunny and cloudy skies and determined the break-even value, where the net radiation is the same for cloudy and sunny skies. Break-even albedos range from 0.30 in September to 0.58 in July. For snow-covered or bare ice, sunny skies always result in less radiative heat input. In contrast, leads always have, and ponds usually have, more radiative input under sunny skies than cloudy skies. S

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Rosida, NFN, and Indah Susanti. "PENGARUH AEROSOL TERHADAP FLUKS RADIASI NETO DI LAPISAN ATAS ATMOSFER DAN DI PERMUKAAN BERDASAR DATA SATELIT [INFLUENCE OF AEROSOL ON NET RADIATION FLUX AT THE TOP OF ATMOSPHERE AND SURFACE BASED ON SATELLITE]." Jurnal Sains Dirgantara 14, no. 2 (2017): 27. http://dx.doi.org/10.30536/j.jsd.2016.v14.a2444.

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The direct effects of aerosols on radiation budget in Indonesia have been analyzed based on radiation flux net data from the Clouds and the Earth's Radiant Energy System (CERES) instrument and aerosol optical depth (AOD) from the Moderate Resolution Imaging Spectroradiometer (MODIS) Terra. Radiation budget calculated including short wave and long-wave radiation. Data from March 2000 until February 2010, processed using Grads version 2 to obtain aerosol radiative forcing value. Net radiation in clean sky, estimated using slope method. The analysis showed high temporal variation of aerosols dens

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JHA, T. N. "Characteristics of radiative and non-radiative energy fluxes over monsoon trough zone." MAUSAM 52, no. 3 (2022): 581–92. http://dx.doi.org/10.54302/mausam.v52i3.1729.

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In order to describe behaviour of radiative and non-radiative erergy fluxes in the surface layer, computation of net radiation, sensible, latent and heat soil flux has been done using hourly global radiation, slow response data of MONTBLEX-90 and surface observation of Varanasi and Jodhpur during rainy and non-rainy days in July 1990. Daily and hourly ground temperature is calculated solving one dimensional heat conduction equation and soil heat flux is computed using force restored method .Outgoing Longwave Radiation (OLR) is calculated by Stefan-Boltzrnann law of radiation and the largest di

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Wang, Zhenhua, Shikui Dong, Zhihong He, Lei Wang, Weihua Yang, and Bengt Ake Sunden. "Numerical analysis of radiative heat transfer in an inhomogeneous and non-isothermal combustion system considering H2O/CO2/CO and soot." International Journal of Numerical Methods for Heat & Fluid Flow 27, no. 9 (2017): 1967–85. http://dx.doi.org/10.1108/hff-03-2016-0127.

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Purpose H2O, CO2 and CO are three main species in combustion systems which have high volume fractions. In addition, soot has strong absorption in the infrared band. Thus, H2O, CO2, CO and soot may take important roles in radiative heat transfer. To provide calculations with high accuracy, all of the participating media should be considered non-gray media. Thus, the purpose of this paper is to study the effect of non-gray participating gases and soot on radiative heat transfer in an inhomogeneous and non-isothermal system. Design/methodology/approach To solve the radiative heat transfer, the fl

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Knight, I. K., and A. L. Sullivan. "A semi-transparent model of bushfire flames to predict radiant heat flux." International Journal of Wildland Fire 13, no. 2 (2004): 201. http://dx.doi.org/10.1071/wf03047.

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The radiation emitted by a body is related through the Stefan-Boltzmann equation to the temperature of the emitting element. In the case of flame, the emitting elements are carbon particles. Existing models of bushfire flame radiation assume, however, that the flame radiates as a surface with an emissivity of 1 (i.e. a blackbody). This is only true when the flame is thick enough to provide a continuous wall of radiating carbon particles. In this paper we propose a semi-physical model of radiant heat flux from bushfire flame that calculates the emissivity of the flame front based on its geometr

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Golkarfard, Vahid, Seyyed Abdolreza Gandjalikhan Nassab, and Amir Babak Ansari. "Simulation of Solid Particles in Combined Conduction, Convection and Radiation Gas Flow over a Backward-Facing Step in a Duct." Applied Mechanics and Materials 110-116 (October 2011): 5276–82. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.5276.

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A numerical simulation procedure for studying deposition of aerosol particles in a laminar convection flow of radiating gas over a backward-facing step including the effect of thermal force is developed. In the gas flow, all of the heat transfer mechanisms consisting of conduction, convection and radiation take place simultaneously. Behavior of solid particles is studied numerically based on an Eulerian–Lagrangian method. Two dimensional Navier-Stokes and energy equations are solved using CFD techniques, while the radiating transfer equation (RTE) is solved by discrete ordinate method (DOM) fo

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Budaev, Bair V., and David B. Bogy. "The role of EM wave polarization on radiative heat transfer across a nanoscale gap." Journal of Applied Physics 132, no. 5 (2022): 054903. http://dx.doi.org/10.1063/5.0094382.

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This work presents a novel study of radiative heat transfer between closely separated plates based on an extension of Planck’s spectrum of thermal radiations to systems with a steady heat flux. This extension together with electromagnetic wave theory is chosen specifically to avoid the commonly used so-called fluctuation dissipation theory, which is also limited to equilibrium systems. The spectrum of thermal radiation with a heat flux is described by the introduction of an analog of a chemical potential, which creates a bias toward the direction of heat transfer. This is the first comprehensi

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13

Smith, Karen L., Michael Previdi, and Lorenzo M. Polvani. "The Antarctic Atmospheric Energy Budget. Part II: The Effect of Ozone Depletion and its Projected Recovery." Journal of Climate 26, no. 24 (2013): 9729–44. http://dx.doi.org/10.1175/jcli-d-13-00173.1.

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Abstract In this study the authors continue their investigation of the atmospheric energy budget of the Antarctic polar cap (the region poleward of 70°S) using integrations of the Whole Atmosphere Community Climate Model from the years 1960 to 2065. In agreement with observational data, it is found that the climatological mean net top-of-atmosphere (TOA) radiative flux is primarily balanced by the horizontal energy flux convergence over the polar cap. On interannual time scales, changes in the net TOA radiative flux are also primarily balanced by changes in the energy flux convergence, with th

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14

Diaz Garcia, Diana Laura, and Yi Huang. "Quantification of Shortwave Surface Albedo Feedback Using a Neural Network Approach." Atmosphere 15, no. 2 (2024): 150. http://dx.doi.org/10.3390/atmos15020150.

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Radiative transfer is a nonlinear process. Despite this, most current methods to evaluate radiative feedback, such as the kernel method, rely on linear assumptions. Neural network (NN) models can emulate nonlinear radiative transfer due to their structure and activation functions. This study aims to test whether NNs can be used to evaluate shortwave radiative feedbacks and to assess their performance. This study focuses on the shortwave radiative feedback driven by surface albedo. An NN model is first trained using idealized cases, simulating truth values from a radiative transfer model via th

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15

Liu, Cheng, Evgeni Fedorovich, Jianping Huang, Xiao-Ming Hu, Yongwei Wang, and Xuhui Lee. "Impact of Aerosol Shortwave Radiative Heating on Entrainment in the Atmospheric Convective Boundary Layer: A Large-Eddy Simulation Study." Journal of the Atmospheric Sciences 76, no. 3 (2019): 785–99. http://dx.doi.org/10.1175/jas-d-18-0107.1.

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AbstractEntrainment is critical to the development of the atmospheric convective boundary layer (CBL), but little is known about how entrainment is impacted by the aerosol radiative effect. An aerosol radiation transfer model is used in conjunction with large-eddy simulation (LES) to quantify the impact of aerosol shortwave radiative heating on entrainment and thermodynamics of an idealized dry CBL under aerosol-loading conditions. An entrainment equation is derived within the framework of a zero-order model (ZOM) with the aerosol radiative heating effect included; the equation is then examine

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16

Wu, Wei, and Yangang Liu. "A new one-dimensional radiative equilibrium model for investigating atmospheric radiation entropy flux." Philosophical Transactions of the Royal Society B: Biological Sciences 365, no. 1545 (2010): 1367–76. http://dx.doi.org/10.1098/rstb.2009.0301.

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A new one-dimensional radiative equilibrium model is built to analytically evaluate the vertical profile of the Earth's atmospheric radiation entropy flux under the assumption that atmospheric longwave radiation emission behaves as a greybody and shortwave radiation as a diluted blackbody. Results show that both the atmospheric shortwave and net longwave radiation entropy fluxes increase with altitude, and the latter is about one order in magnitude greater than the former. The vertical profile of the atmospheric net radiation entropy flux follows approximately that of the atmospheric net longw

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17

Atashafrooz, M., and SA Gandjalikhan Nassab. "Simulation of three-dimensional laminar forced convection flow of a radiating gas over an inclined backward-facing step in a duct under bleeding condition." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 2 (2012): 332–45. http://dx.doi.org/10.1177/0954406212447657.

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This study presents a numerical analysis of three-dimensional laminar forced convection flow of a radiating gas over an inclined backward-facing step in a rectangular duct under bleeding condition. The fluid is treated as a gray, absorbing, emitting, and scattering medium. The three-dimensional Cartesian coordinate system is used to solve the governing equations which are the conservations of mass, momentum, and energy. These equations are solved numerically using the computational fluid dynamic techniques to obtain the temperature and velocity fields, while the blocked-off method is employed

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Ansaria, Amir, and Nassaba Gandjalikhan. "Forced convection of radiating gas over an inclined backward facing step using the blocked-off method." Thermal Science 17, no. 3 (2013): 773–86. http://dx.doi.org/10.2298/tsci110112132a.

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The present work investigates the laminar forced convection flow of a radiating gas over an inclined backward facing step (BFS) in a horizontal duct. The momentum and energy equations are solved numerically by the CFD techniques to obtain the velocity and temperature fields. Since, the twodimensional Cartesian coordinate system is used to solve the governing equations; the flow over inclined surface is simulated by considering the blocked-off region in regular grid. Discretized forms of the governing equations in the (x,y) plane are obtained by the control volume method and solved using the SI

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19

Miller, Mark A., Virendra P. Ghate, and Robert K. Zahn. "The Radiation Budget of the West African Sahel and Its Controls: A Perspective from Observations and Global Climate Models." Journal of Climate 25, no. 17 (2012): 5976–96. http://dx.doi.org/10.1175/jcli-d-11-00072.1.

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Abstract Continuous measurements of the shortwave (SW), longwave (LW), and net cross-atmosphere radiation flux divergence over the West African Sahel were made during the year 2006 using the Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF) and the Geostationary Earth Radiation Budget (GERB) satellite. Accompanying AMF measurements enabled calculations of the LW, SW, and net top of the atmosphere (TOA) and surface cloud radiative forcing (CRF), which quantifies the radiative effects of cloud cover on the column boundaries. Calculations of the LW, SW, and net cloud radiative effect

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20

Damm, David L., and Andrei G. Fedorov. "Spectral Radiative Heat Transfer Analysis of the Planar SOFC." Journal of Fuel Cell Science and Technology 2, no. 4 (2005): 258–62. http://dx.doi.org/10.1115/1.2041667.

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Thermo-mechanical failure of components in planar-type solid oxide fuel cells (SOFCs) depends strongly on the local temperature gradients at the interfaces of different materials. Therefore, it is of paramount importance to accurately predict the temperature fields within the stack, especially near the interfaces. Because of elevated operating temperatures (of the order of 1000K or even higher), radiation heat transfer could become a dominant mode of heat transfer in the SOFCs. In this study, we extend our recent work on radiative effects in solid oxide fuel cells [J. Power Sources, 124, No. 2

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Zhang, Xi, Cheng Li, Huazhi Ge, and Tianhao Le. "The Inhomogeneity Effect. III. Weather Impacts on the Heat Flow of Hot Jupiters." Astrophysical Journal 957, no. 1 (2023): 22. http://dx.doi.org/10.3847/1538-4357/acee7d.

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Abstract The interior flux of a giant planet impacts atmospheric motion, and the atmosphere dictates the interior’s cooling. Here we use a non-hydrostatic general circulation model (Simulating Non-hydrostatic Atmospheres on Planets) coupled with a multi-stream multi-scattering radiative module (High-performance Atmospheric Radiation Package) to simulate the weather impacts on the heat flow of hot Jupiters. We found that the vertical heat flux is primarily transported by convection in the lower atmosphere and regulated by dynamics and radiation in the overlying radiation-circulation zone. The t

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Makarieva, A. M., V. G. Gorshkov, and T. Pujol. "Height of convective layer in planetary atmospheres with condensable and non-condensable greenhouse substances." Atmospheric Chemistry and Physics Discussions 3, no. 6 (2003): 6701–20. http://dx.doi.org/10.5194/acpd-3-6701-2003.

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Abstract. Convection reduces greenhouse effect by transporting a certain amount of non-radiative dynamic energy to the upper atmosphere, where this energy dissipates and radiates into space without interaction with greenhouse substances in the lower atmosphere. In this paper we show that the height of the convective layer zc is finite and independent of atmospheric optical thickness τs at large values of the latter. We derive an analytical formula for zc at large values of τs for condensable and non-condensable greenhouse substances. The formula obtained yields reasonable quantitative estimate

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Hoch, S. W., P. Calanca, R. Philipona, and A. Ohmura. "Year-Round Observation of Longwave Radiative Flux Divergence in Greenland." Journal of Applied Meteorology and Climatology 46, no. 9 (2007): 1469–79. http://dx.doi.org/10.1175/jam2542.1.

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Abstract Longwave radiative flux divergence within the lowest 50 m of the atmospheric boundary layer was observed during the Eidgenössische Technische Hochschule (ETH) Greenland Summit experiment. The dataset collected at 72°35′N, 38°30′W, 3203 m MSL is based on longwave radiation measurements at 2 and 48 m that are corrected for the influence of the supporting tower structure. The observations cover all seasons and reveal the magnitude of longwave radiative flux divergence and its incoming and outgoing component under stable and unstable conditions. Longwave radiative flux divergence during w

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Котов, М. А., П. В. Козлов, В. Ю. Левашов та ін. "Регистрация радиационного теплового потока в ударной трубе с помощью термоэлектрического детектора". Письма в журнал технической физики 49, № 17 (2023): 36. http://dx.doi.org/10.21883/pjtf.2023.17.56086.19633.

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The results of experimental studies on registration of the radiative component of the total heat flux by a thermoelectric detector in a reflected shock wave are presented. An increase in the contribution of radiation to the heat flux with an increase in the intensity of the shock wave is estimated. It is shown that the technique can be used in experiments in shock tubes to isolate the radiative component of the total heat flux, and the thermoelectric detector itself can be successfully used to record such parameters.

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Fu, X., L. Liang, W. Ma, H. Cui, and Y. Zhao. "EHFE refinement and extension for variable physical Earth radiation in spacecraft uncertainty thermal analysis." Journal of Physics: Conference Series 2746, no. 1 (2024): 012018. http://dx.doi.org/10.1088/1742-6596/2746/1/012018.

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Abstract Spacecraft uncertainty thermal analysis is an important part of ensuring robust and reliable spacecraft thermal control system design. The calculation of the Earth external heat flux is an important part of it, however, the current model for calculating the Earth external heat flux is the constant physical Earth radiation model. In this paper, a model of the Earth’s variable physical radiation is developed based on the long-term averaging method. We refine and extend the application of the external heat flux expansion (EHFE) formula to accommodate our proposed model. This study furthe

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Khemani, Kamal, and Pradeep Kumar. "Radiative heat transfer calculation for mixture of gases using full spectrum k-distribution method." Journal of Physics: Conference Series 2116, no. 1 (2021): 012065. http://dx.doi.org/10.1088/1742-6596/2116/1/012065.

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Abstract The full spectrum k-distribution method is used to obtain radiative heat flux and divergence of radiative heat flux for two test cases, containing mixture of CO 2 and H 2 O at different concentration and temperature keeping pressure constant. The k-distribution for mixture of gases is obtained from individual gas k-distribution using three different mixing models, viz., superposition, multiplication and hybrid model. Further, the radiative transfer equation (RTE) is solved by the finite volume discrete ordinate method (FVDOM) to obtain the radiative flux and the radiation source term.

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Miller, Nathaniel B., Matthew D. Shupe, Christopher J. Cox, David Noone, P. Ola G. Persson, and Konrad Steffen. "Surface energy budget responses to radiative forcing at Summit, Greenland." Cryosphere 11, no. 1 (2017): 497–516. http://dx.doi.org/10.5194/tc-11-497-2017.

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Abstract. Greenland Ice Sheet surface temperatures are controlled by an exchange of energy at the surface, which includes radiative, turbulent, and ground heat fluxes. Data collected by multiple projects are leveraged to calculate all surface energy budget (SEB) terms at Summit, Greenland, for the full annual cycle from July 2013 to June 2014 and extend to longer periods for the radiative and turbulent SEB terms. Radiative fluxes are measured directly by a suite of broadband radiometers. Turbulent sensible heat flux is estimated via the bulk aerodynamic and eddy correlation methods, and the tu

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Dai Guilong, 戴贵龙, 庄莹 Zhuang Ying, 王孝宇 Wang Xiaoyu та 庄宇 Zhuang Yu. "曲面太阳辐射能流密度的实验测量". Laser & Optoelectronics Progress 60, № 5 (2023): 0529001. http://dx.doi.org/10.3788/lop220702.

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Zhang, Chong, Zhongnong Zhang, and Chun Lou. "Thermodynamic Irreversibility Analysis of Thermal Radiation in Coal-Fired Furnace: Effect of Coal Ash Deposits." Materials 16, no. 2 (2023): 799. http://dx.doi.org/10.3390/ma16020799.

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In this paper, a three-dimensional (3-D) high-temperature furnace filled with a gas-solid medium was investigated, and the radiative transfer equation and the radiative entropy transfer equation in the chamber were applied in order to analyze the effect of coal deposits on thermal radiation. The heat flux on the walls of the furnace and the entropy generation rate were determined due to the irreversibility of the radiative heat transfer process in the furnace. Furthermore, the effect of ash deposits on the wall surface on the irreversibility of the radiation heat transfer process was investiga

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Kylling, A., A. R. Webb, R. Kift, et al. "Spectral actinic flux in the lower troposphere: measurement and 1-D simulations for cloudless, broken cloud and overcast situations." Atmospheric Chemistry and Physics 5, no. 7 (2005): 1975–97. http://dx.doi.org/10.5194/acp-5-1975-2005.

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Abstract. In September 2002, the first INSPECTRO campaign to study the influence of clouds on the spectral actinic flux in the lower troposphere was carried out in East Anglia, England. Measurements of the actinic flux, the irradiance and aerosol and cloud properties were made from four ground stations and by aircraft. The radiation measurements were modelled using the uvspec model and ancillary data. For cloudless conditions, the measurements of the actinic flux were reproduced by 1-D radiative transfer modelling within the measurement and model uncertainties of about ±10%. For overcast days,

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Vicquelin, R., Y. F. Zhang, O. Gicquel, and J. Taine. "Effects of radiation in turbulent channel flow: analysis of coupled direct numerical simulations." Journal of Fluid Mechanics 753 (July 25, 2014): 360–401. http://dx.doi.org/10.1017/jfm.2014.368.

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AbstractThe role of radiative energy transfer in turbulent boundary layers is carefully analysed, focusing on the effect on temperature fluctuations and turbulent heat flux. The study is based on direct numerical simulations (DNS) of channel flows with hot and cold walls coupled to a Monte-Carlo method to compute the field of radiative power. In the conditions studied, the structure of the boundary layers is strongly modified by radiation. Temperature fluctuations and turbulent heat flux are reduced, and new radiative terms appear in their respective balance equations. It is shown that they co

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de Boer, G., W. D. Collins, S. Menon, and C. N. Long. "Using surface remote sensors to derive radiative characteristics of Mixed-Phase Clouds: an example from M-PACE." Atmospheric Chemistry and Physics 11, no. 23 (2011): 11937–49. http://dx.doi.org/10.5194/acp-11-11937-2011.

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Abstract. Measurements from ground-based cloud radar, high spectral resolution lidar and microwave radiometer are used in conjunction with a column version of the Rapid Radiative Transfer Model (RRTMG) and radiosonde measurements to derive the surface radiative properties under mixed-phase cloud conditions. These clouds were observed during the United States Department of Energy (US DOE) Atmospheric Radiation Measurement (ARM) Mixed-Phase Arctic Clouds Experiment (M-PACE) between September and November of 2004. In total, sixteen half hour time periods are reviewed due to their coincidence with

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Flamant, G., J. D. Lu, and B. Variot. "Radiation Heat Transfer in Fluidized Beds: A Comparison of Exact and Simplified Approaches." Journal of Heat Transfer 116, no. 3 (1994): 652–59. http://dx.doi.org/10.1115/1.2910919.

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Radiation heat transfer at heat exchanger walls in fluidized beds has never been examined through a complete formulation of the problem. In this paper a wall-to-bed heat transfer model is proposed to account for particle convection, gas convection, and radiation exchange in a variable porosity medium. Momentum, energy, and intensity equations are solved in order to determine the velocity, temperature, radiative heat flux profiles and heat transfer coefficients. The discrete-ordinates method is used to compute the radiative intensity equation and the radiative flux divergence in the energy equa

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Kuai, Le, Kevin W. Bowman, Kazuyuki Miyazaki, et al. "Attribution of Chemistry-Climate Model Initiative (CCMI) ozone radiative flux bias from satellites." Atmospheric Chemistry and Physics 20, no. 1 (2020): 281–301. http://dx.doi.org/10.5194/acp-20-281-2020.

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Abstract. The top-of-atmosphere (TOA) outgoing longwave flux over the 9.6 µm ozone band is a fundamental quantity for understanding chemistry–climate coupling. However, observed TOA fluxes are hard to estimate as they exhibit considerable variability in space and time that depend on the distributions of clouds, ozone (O3), water vapor (H2O), air temperature (Ta), and surface temperature (Ts). Benchmarking present-day fluxes and quantifying the relative influence of their drivers is the first step for estimating climate feedbacks from ozone radiative forcing and predicting radiative forcing evo

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Buckus, Raimondas, Aleksandras Chlebnikovas, Birute Strukcinskiene, et al. "Simulating the Dispersion of the Energy Flux Density of the Electromagnetic Field Generated by Antennas for Mobile Communications." Electronics 11, no. 15 (2022): 2431. http://dx.doi.org/10.3390/electronics11152431.

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The last two decades have faced a significantly increased number of telecommunication antennas emitting electromagnetic radiation in residential areas. The theoretical simulation of the dispersion of the energy flux density of the electromagnetic field has been performed applying the physical peculiarities of the waves generating electromagnetic radiation. Having evaluated studies on simulation, the visual representation of the spread of electromagnetic radiation has been carried out according to the results obtained applying the AutoCad package. A comparison of the simulated value of the ener

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Menart, J. A., and HaeOk Skarda Lee. "Nongray Gas Analyses for Reflecting Walls Utilizing a Flux Technique." Journal of Heat Transfer 115, no. 3 (1993): 645–52. http://dx.doi.org/10.1115/1.2910735.

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A flux formulation for a planar slab of molecular gas radiation bounded by diffuse reflecting walls is developed. While this formulation is limited to the planar geometry, it is useful for studying approximations necessary in modeling nongray radiative heat transfer. The governing equations are derived by considering the history of multiple reflections between the walls. Accurate solutions are obtained by explicitly accounting for a finite number of reflections and approximating the spectral effects of the remaining reflections. Four approximate methods are presented and compared using a singl

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Nashine, Prerana, and Ashok Kumar Satapathy. "Transient Radiation Coupled With Conduction Heat Transfer in a One Dimensional Slab." Applied Mechanics and Materials 619 (August 2014): 94–98. http://dx.doi.org/10.4028/www.scientific.net/amm.619.94.

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The present research work views over a solution of radiative transport problem along with conduction in one perspective piece and in the existence of participating media. The radiative transfer equations are developed for anisotropically scattering, absorbing, emitting medium and the equation is being discretized using finite volume method. Heat flux and the incident radiation effects have been computed at three different time step. Transient radiation along with transient conduction is solved and the radiative effect has been measured using radiative transfer equation while the conduction ter

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Wen, Guoyong, Alexander Marshak, Si-Chee Tsay, et al. "Changes in the surface broadband shortwave radiation budget during the 2017 eclipse." Atmospheric Chemistry and Physics 20, no. 17 (2020): 10477–91. http://dx.doi.org/10.5194/acp-20-10477-2020.

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Abstract. While solar eclipses are known to greatly diminish the visible radiation reaching the surface of the Earth, less is known about the magnitude of the impact. We explore both the observed and modeled levels of change in surface radiation during the eclipse of 2017. We deployed a pyranometer and Pandora spectrometer instrument to Casper, Wyoming, and Columbia, Missouri, to measure surface broadband shortwave (SW) flux and atmospheric properties during the 21 August 2017 solar eclipse event. We performed detailed radiative transfer simulations to understand the role of clouds in spectral

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Seaton, M. J. "Atomic Opacities." International Astronomical Union Colloquium 146 (1994): 265–70. http://dx.doi.org/10.1017/s0252921100021382.

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LetIv(r, θ) be the intensity of radiation of frequencyv, at a distancerfrom the centre of a star and in a direction making an angleθto the outward normal. In a plane-parallel approximation the equation of radiative transfer iswhere𝛋vis the opacity andjvthe emissivity. The net outward flux of radiant energy isand the flux integrated over all frequencies is

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Krinitskiy, Mikhail, Vasilisa Koshkina, Mikhail Borisov, Nikita Anikin, Sergey Gulev, and Maria Artemeva. "Machine Learning Models for Approximating Downward Short-Wave Radiation Flux over the Ocean from All-Sky Optical Imagery Based on DASIO Dataset." Remote Sensing 15, no. 7 (2023): 1720. http://dx.doi.org/10.3390/rs15071720.

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Downward short-wave (SW) solar radiation is the only essential energy source powering the atmospheric dynamics, ocean dynamics, biochemical processes, and so forth on our planet. Clouds are the main factor limiting the SW flux over the land and the Ocean. For the accurate meteorological measurements of the SW flux one needs expensive equipment-pyranometers. For some cases where one does not need golden-standard quality of measurements, we propose estimating incoming SW radiation flux using all-sky optical RGB imagery which is assumed to incapsulate the whole information about the downward SW f

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Fukao, Shinji, Jun Kondo, Yoshikazu Nakanishi, Yoshiaki Ito, and Shinzo Yoshikado. "Excitation of X-Rays Using Polarized LiNbO₃ Single Crystal." Key Engineering Materials 301 (January 2006): 205–10. http://dx.doi.org/10.4028/www.scientific.net/kem.301.205.

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The radiation of X-rays using the electric charge generated by a temperature change of a LiNbO3 single crystal has been investigated. When the LiNbO3 single crystal was placed in a conductive cylindrical pipe made of graphite, aluminum or copper, the photon flux of the radiated X-rays was dependent on the type of conductive material used. Depending on the type of materials on which the crystal was placed, the photon flux of the radiated X-rays increased with decreasing work function of the material.

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Li, Hong Mei, Ying Chao Han, and Jing Hui Qiu. "Analytical Investigation of Radiation Characteristic for Radio Frequencies Magnetic Flux Compression Generator." Applied Mechanics and Materials 143-144 (December 2011): 796–99. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.796.

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Radio frequencies magnetic flux compression generator is capable of producing and radiating ultra high power electromagnetic pulse by compressing magnetic field. As a maneuverable device, radio frequencies magnetic flux compression generator design has been developed and tested, it has been found widespread use in many fields. The radio performance is one of the most important parameters for radio frequencies magnetic flux compression generator. In this paper, the output current and voltage is given based on equivalent circuit model. In a bid to deliberate the radiation characteristic particul

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Kremens, R. L., M. B. Dickinson, and A. S. Bova. "Radiant flux density, energy density and fuel consumption in mixed-oak forest surface fires." International Journal of Wildland Fire 21, no. 6 (2012): 722. http://dx.doi.org/10.1071/wf10143.

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Closing the wildland fire heat budget involves characterising the heat source and energy dissipation across the range of variability in fuels and fire behaviour. Meeting this challenge will lay the foundation for predicting direct ecological effects of fires and fire–atmosphere coupling. In this paper, we focus on the relationships between the fire radiation field, as measured from the zenith, fuel consumption and the behaviour of spreading flame fronts. Experiments were conducted in 8 × 8-m outdoor plots using preconditioned wildland fuels characteristic of mixed-oak forests of the eastern Un

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Dübal, Hans-Rolf, and Fritz Vahrenholt. "Radiative Energy Flux Variation from 2001–2020." Atmosphere 12, no. 10 (2021): 1297. http://dx.doi.org/10.3390/atmos12101297.

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Radiative energy flux data, downloaded from CERES, are evaluated with respect to their variations from 2001 to 2020. We found the declining outgoing shortwave radiation to be the most important contributor for a positive TOA (top of the atmosphere) net flux of 0.8 W/m2 in this time frame. We compare clear sky with cloudy areas and find that changes in the cloud structure should be the root cause for the shortwave trend. The radiative flux data are compared with ocean heat content data and analyzed in the context of a longer-term climate system enthalpy estimation going back to the year 1750. W

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Trujillo, Francisco J., Tomasz Safinski, and Adesoji A. Adesina. "CFD Analysis of the Radiation Distribution in a New Immobilized Catalyst Bubble Column Externally Illuminated Photoreactor." Journal of Solar Energy Engineering 129, no. 1 (2006): 27–36. http://dx.doi.org/10.1115/1.2391013.

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A new externally irradiated photoreactor configuration combining the excellent mass transfer characteristics of a bubble column operation with the separation power of an immobilized catalyst on quartz plates has been investigated using computational fluid dynamics (CFD) simulation. The radiative transport equation (RTE) in conjunction with the Navier-Stokes equations were solved to obtain the light incident radiative flux and the light absorbed by the immobilized titania as a function of the gas superficial velocity, the angle of inclination, and the separating distance between the plates. The

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Vargas, William E. "Two-flux radiative transfer model under nonisotropic propagating diffuse radiation." Applied Optics 38, no. 7 (1999): 1077. http://dx.doi.org/10.1364/ao.38.001077.

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Zare, Mehdi, and Sadegh Sadeghi. "Development of hybrid method for coupled conduction-radiation heat transfer in two-dimensional irregular enclosure considering thermo-radiative effects and varying thermal conductivity." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 4 (2019): 1815–37. http://dx.doi.org/10.1108/hff-11-2018-0667.

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Purpose This study aims to perform a comprehensive investigation to model the thermal characteristics of a coupled conduction-radiation heat transfer in a two-dimensional irregular enclosure including a triangular-shaped heat source. Design/methodology/approach For this purpose, a promising hybrid technique based on the concepts of blocked-off method, FVM and DOM is developed. The enclosure consists of several horizontal, vertical and oblique walls, and thermal conductivity within the enclosure varies directly with temperature and indirectly with position. To simplify the complex geometry, a p

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Yang, Bin, Yuri Knyazikhin, Donghui Xie, Haimeng Zhao, Junqiang Zhang, and Yi Wu. "Influence of Leaf Specular Reflection on Canopy Radiative Regime Using an Improved Version of the Stochastic Radiative Transfer Model." Remote Sensing 10, no. 10 (2018): 1632. http://dx.doi.org/10.3390/rs10101632.

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Interpreting remotely-sensed data requires realistic, but simple, models of radiative transfer that occurs within a vegetation canopy. In this paper, an improved version of the stochastic radiative transfer model (SRTM) is proposed by assuming that all photons that have not been specularly reflected enter the leaf interior. The contribution of leaf specular reflection is considered by modifying leaf scattering phase function using Fresnel reflectance. The canopy bidirectional reflectance factor (BRF) estimated from this model is evaluated through comparisons with field-measured maize BRF. The

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Huang, Han, and Yi Huang. "Radiative sensitivity quantified by a new set of radiation flux kernels based on the ECMWF Reanalysis v5 (ERA5)." Earth System Science Data 15, no. 7 (2023): 3001–21. http://dx.doi.org/10.5194/essd-15-3001-2023.

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Abstract. Radiative sensitivity, i.e., the response of the radiative flux to climate perturbations, is essential to understanding climate change and variability. The sensitivity kernels computed by radiative transfer models have been broadly used for assessing the climate forcing and feedbacks for global warming. As these assessments are largely focused on the top of atmosphere (TOA) radiation budget, less attention has been paid to the surface radiation budget or the associated surface radiative sensitivity kernels. Based on the fifth generation European Center for Medium-Range Weather Foreca

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Yang, Bolei, and Zhe-Min Tan. "Interactive Radiation Accelerates the Intensification of the Midlevel Vortex for Tropical Cyclogenesis." Journal of the Atmospheric Sciences 77, no. 12 (2020): 4051–65. http://dx.doi.org/10.1175/jas-d-20-0094.1.

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AbstractInteractive radiation helps accelerate tropical cyclogenesis, but the mechanism is still unclear. Using idealized numerical modeling in the radiative–convective equilibrium framework, it is revealed that interactive radiation can bring forward tropical cyclogenesis by accelerating the development of the midlevel vortex. A strong horizontal longwave radiative warming anomaly in the layer between 6 and 11 km altitudes in the vortex region, caused by large concentration of ice-phased particles at high levels, is critical to the development of the midlevel vortex. This longwave radiative w

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