Documents disponibles écrits par cet auteur

Effect of selective accommodation on soot aggregate shielding in time-resolved laser-induced incandescence experiments / K. J. Daun in Journal of heat transfer, Vol. 132 N° 9 (Septembre 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 9 (Septembre 2010) . - pp. [091202-1/8] Titre : Effect of selective accommodation on soot aggregate shielding in time-resolved laser-induced incandescence experiments Type de document : texte imprimé Auteurs : K. J. Daun, Auteur Article en page(s) : pp. [091202-1/8] Note générale : Physique Langues : Anglais (eng) Mots-clés : Combustion  Laser-induced  incandescence  Soot  Free-molecular  conduction  Gas-surface  scattering Index. décimale : 536 Chaleur. Thermodynamique Résumé : Time-resolved laser-induced incandescence is an emerging diagnostic for characterizing primary particle size distributions within soot-laden aerosols. This measurement requires an accurate model of heat conduction between the laser-energized soot and the surrounding gas, which is complicated by the fractal-like structure of soot aggregates since primary particles on the aggregate exterior shield the interior from approaching gas molecules. Previous efforts to characterize aggregate shielding through direct simulation Monte Carlo analysis assume a Maxwell scattering kernel, which poorly represents actual gas/surface interactions. This paper shows how selective thermal accommodation into the translational and rotational modes of the gas molecule influences the aggregate shielding effect using the Cercignani–Lampis–Lord kernel and thermal accommodation coefficients derived from molecular dynamics simulations. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Effect of selective accommodation on soot aggregate shielding in time-resolved laser-induced incandescence experiments [texte imprimé] / K. J. Daun, Auteur . - pp. [091202-1/8]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 9 (Septembre 2010) . - pp. [091202-1/8] Mots-clés : Combustion  Laser-induced  incandescence  Soot  Free-molecular  conduction  Gas-surface  scattering Index. décimale : 536 Chaleur. Thermodynamique Résumé : Time-resolved laser-induced incandescence is an emerging diagnostic for characterizing primary particle size distributions within soot-laden aerosols. This measurement requires an accurate model of heat conduction between the laser-energized soot and the surrounding gas, which is complicated by the fractal-like structure of soot aggregates since primary particles on the aggregate exterior shield the interior from approaching gas molecules. Previous efforts to characterize aggregate shielding through direct simulation Monte Carlo analysis assume a Maxwell scattering kernel, which poorly represents actual gas/surface interactions. This paper shows how selective thermal accommodation into the translational and rotational modes of the gas molecule influences the aggregate shielding effect using the Cercignani–Lampis–Lord kernel and thermal accommodation coefficients derived from molecular dynamics simulations. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

Geometric optimization of concentrating solar collectors using Monte Carlo simulation / A. J. Marston in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 4 (Novembre 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 4 (Novembre 2010) . - pp. [041002/1-9] Titre : Geometric optimization of concentrating solar collectors using Monte Carlo simulation Type de document : texte imprimé Auteurs : A. J. Marston, Auteur ; K. J. Daun, Auteur ; M. R. Collins, Auteur Année de publication : 2011 Article en page(s) : pp. [041002/1-9] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Monte  Carlo  methods  Regression  analysis  Solar  absorber-convertors  Stochastic  programming Index. décimale : 621.47 Résumé : This paper presents an optimization algorithm for designing linear concentrating solar collectors using stochastic programming. A Monte Carlo technique is used to quantify the performance of the collector design in terms of an objective function, which is then minimized using a modified Kiefer–Wolfowitz algorithm that uses sample size and step size controls. This process is more efficient than traditional “trial-and-error” methods and can be applied more generally than techniques based on geometric optics. The method is validated through application to the design of three different configurations of linear concentrating collector. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Geometric optimization of concentrating solar collectors using Monte Carlo simulation [texte imprimé] / A. J. Marston, Auteur ; K. J. Daun, Auteur ; M. R. Collins, Auteur . - 2011 . - pp. [041002/1-9]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 4 (Novembre 2010) . - pp. [041002/1-9] Mots-clés : Monte  Carlo  methods  Regression  analysis  Solar  absorber-convertors  Stochastic  programming Index. décimale : 621.47 Résumé : This paper presents an optimization algorithm for designing linear concentrating solar collectors using stochastic programming. A Monte Carlo technique is used to quantify the performance of the collector design in terms of an objective function, which is then minimized using a modified Kiefer–Wolfowitz algorithm that uses sample size and step size controls. This process is more efficient than traditional “trial-and-error” methods and can be applied more generally than techniques based on geometric optics. The method is validated through application to the design of three different configurations of linear concentrating collector. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]