Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19最新文献_第5页

APPLICATION OF THE DISCRETE ORDINATES METHOD TO MEDIA WITH STRONG FORWARD AND BACKWARD SCATTERING SUBJECTED TO COLLIMATED IRRADIATION 离散坐标法在准直辐照强前向和后向散射介质中的应用

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/rad-19.300

P. Coelho

{"title":"APPLICATION OF THE DISCRETE ORDINATES METHOD TO MEDIA WITH STRONG FORWARD AND BACKWARD SCATTERING SUBJECTED TO COLLIMATED IRRADIATION","authors":"P. Coelho","doi":"10.1615/rad-19.300","DOIUrl":"https://doi.org/10.1615/rad-19.300","url":null,"abstract":"Highly anisotropic phase functions are often approximated by simpler ones given by the sum of a Dirac delta function and a smooth function. However, if both forward and backward scattering are important, two Dirac delta functions are needed. In problems without collimated radiation, those phase functions can be easily handled using the discrete ordinates method (DOM). However, when collimated irradiation is present, the DOM cannot be applied using the decomposition of the radiation intensity into a diffuse and a collimated component. A new formulation of the DOM to solve radiative transfer problems with collimated irradiation in anisotropically scattering media with such approximate phase functions is described in this work. The proposed method is based on a decomposition of the radiation intensity into three components, namely a collimated, a backscattered collimated and a diffuse component. Application of the method to problems without and with collimated radiation show that the approximated phase function yields accurate results in the former case, while in latter does not perform so well, particularly for media with an optical thickness of the order of unity or lower.","PeriodicalId":413005,"journal":{"name":"Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126022876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

NUMERICAL TREATMENT OF HIGHLY FORWARD SCATTERING ON RADIATIVE TRANSFER USING THE DELTA-M APPROXIMATION AND GALERKIN QUADRATURE METHOD 用delta-m近似和伽辽金正交法数值处理辐射传输中的高度前向散射

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/RAD-19.320

H. Fujii, G. Chiba, Yukio Yamada, Y. Hoshi, K. Kobayashi, Masao Watanabe

引用次数: 1

PERFORMANCE ANALYSIS MODEL FOR A NEAR-FIELD THERMOPHOTOVOLTAIC SYSTEM WITH A BACKSIDE REFLECTOR 带后反射镜的近场热光伏系统性能分析模型

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/RAD-19.460

Mikyung Lim, Jaeman Song, Seung S. Lee, Bong Jae Lee

引用次数: 1

NUMERICAL SOLUTION OF LBL SPECTRAL RADIATION OF A N-HEPTANE POOL FIRE 正庚烷池火LBL光谱辐射的数值解

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/rad-19.80

H. Bordbar, S. Hostikka

{"title":"NUMERICAL SOLUTION OF LBL SPECTRAL RADIATION OF A N-HEPTANE POOL FIRE","authors":"H. Bordbar, S. Hostikka","doi":"10.1615/rad-19.80","DOIUrl":"https://doi.org/10.1615/rad-19.80","url":null,"abstract":"The spectral characteristics of radiation coming from a pool fire flame are numerically obtained. The case study is a 2m n-heptane pool fire located in the bottom of a 4m×4m×5m rectangular domain. Transient heat and mass transfer of the system was solved using CFD code Fire Dynamic Simulator (FDS) with LES of turbulence and a two-step combustion reaction. The time averaged solution data of gas compositions, soot concentration and temperature along a line in the system were collected. Using the time averaged CFD data, two different onedimensional models assuming parallel plate conditions and a line of sight solution were built to study the spectral radiative intensity observed outside the flame. The high-resolution LBL spectral absorption profiles of combustion gases together with a spectral model for soot absorption coefficient were used in spectral solution of thermal radiation along the line for both assumptions of parallel plates (using DO method) and line of the sight conditions. The spectral radiation profile reaching an imaginary sensor is qualitatively compared with the recently published experimental data of Kerosene large pool fires. The modelling results revealed the strong absorption effect of cold atmospheric gases while the emission peak of hot CO2 at ~2200cm in fire is still quite distinguishable from the spectral profile of hot blackbody even at 23 meters away from the center of the flame. This emission peak can be therefore used for detection of the fire. Using the scaled CFD data for smaller pools showed that the difference between the spectral profiles of the fire and those of hot blackbodies is larger for smaller pools. It means that the detection of smaller fires using the spectral radiation characteristics is easier than that of larger fires where strong effect of soot emission caused more blackbody-like behavior.","PeriodicalId":413005,"journal":{"name":"Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133186367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

APPLICATION OF WEIGHTED SUM OF GRAY GAS NON-GRAY MODEL TO RAYLEIGH-BENARD PROBLEM IN RADIATING FLUID 灰色气体非灰色模型加权和在辐射流体瑞利-贝纳问题中的应用

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/RAD-19.370

Shashikant Cholake, T. Sundararajan, S. Venkateshan

引用次数: 0

Quantifying Flare Combustion Efficiency through MWIR Imaging 通过MWIR成像量化耀斑燃烧效率

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/RAD-19.30

R. B. Miguel, Jeremy N. Thornock, K. Daun

引用次数: 0

MAXIMUM-ENTROPY INSPIRED INTERPOLATIVE CLOSURE FOR RADIATIVE HEAT TRANSFER IN GRAY PARTICIPATING MEDIA 灰色参与介质中辐射传热的最大熵启发插值闭包

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/RAD-19.310

J. Sarr, C. Groth

{"title":"MAXIMUM-ENTROPY INSPIRED INTERPOLATIVE CLOSURE FOR RADIATIVE HEAT TRANSFER IN GRAY PARTICIPATING MEDIA","authors":"J. Sarr, C. Groth","doi":"10.1615/RAD-19.310","DOIUrl":"https://doi.org/10.1615/RAD-19.310","url":null,"abstract":"A new interpolative-based approximation of the second-order maximum-entropy (M2) moment closure for predicting radiative heat transfer in gray participating media is proposed and described. In addition to maintaining the desirable properties of the original M2 closure, the proposed interpolative approximation provides significant reduction in computational costs compared to the expensive numerical solution of the corresponding optimization problem for entropy maximization. Its predictive capabilities are assessed, by considering test problems involving radiative heat transfer within two-dimensional enclosures, the results for which are compared to solutions of the first-order maximum entropy (M1) moment closure, as well as those of the more commonly adopted spherical harmonics moment closure techniques (first-order P1 and third-order P3) and the popular discrete ordinates method (DOM). The latter is used as a benchmark for comparisons, whenever exact solutions are not available. The numerical results show that the solutions of the proposed interpolative M2 closure are better than those of M1, P1 and P3 for virtually all cases considered.","PeriodicalId":413005,"journal":{"name":"Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131490849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

INVESTIGATING NON-INCANDESCENCE EMISSION DURING LASER INDUCED INCANDESCENCE EXPERIMENTS ON AEROSOLIZED PLASMONIC NANOPARTICLES 研究雾化等离子体纳米粒子激光诱导白炽实验中的非白炽发射

Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 Pub Date : 1900-01-01 DOI: 10.1615/rad-19.190

S. Talebi-Moghaddam, S. Robinson-Enebeli, T. Sipkens, A. Klinkova, K. Daun

引用次数: 0