Documents disponibles écrits par cet auteur

Tomography-based analysis of radiative transfer in reacting packed beds undergoing a solid-gas thermochemical transformation / Sophia Haussener in Journal of heat transfer, Vol. 132 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 6 (Juin 2010) . - pp. [061201-1/7] Titre : Tomography-based analysis of radiative transfer in reacting packed beds undergoing a solid-gas thermochemical transformation Type de document : texte imprimé Auteurs : Sophia Haussener, Auteur ; Wojciech Lipinski, Auteur ; Peter Wyss, Auteur Article en page(s) : pp. [061201-1/7] Note générale : Physique Langues : Anglais (eng) Mots-clés : Packed-bed  radiation  Solar  energy  Gasification  Chemical  reactors Index. décimale : 536 Chaleur. Thermodynamique Résumé : A reacting packed-bed undergoing a high-temperature thermochemical solid-gas transformation is considered. The steam- and dry-gasification of carbonaceous materials to syngas is selected as the model reaction. The exact 3D digital geometrical representation of the packed-bed is obtained by computer tomography and used in direct pore-level simulations to characterize its morphological and radiative transport properties as a function of the reaction extent. Two-point correlation functions and mathematical morphology operations are applied to calculate porosities, specific surfaces, particle-size distributions, and representative elementary volumes. The collision-based Monte Carlo method is applied to determine the probability distribution of attenuation path length and direction of incidence at the solid-fluid boundary, which are linked to the extinction coefficient, scattering phase function, and scattering albedo. These effective properties can be then incorporated in continuum models of the reacting packed-bed. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Tomography-based analysis of radiative transfer in reacting packed beds undergoing a solid-gas thermochemical transformation [texte imprimé] / Sophia Haussener, Auteur ; Wojciech Lipinski, Auteur ; Peter Wyss, Auteur . - pp. [061201-1/7]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 6 (Juin 2010) . - pp. [061201-1/7] Mots-clés : Packed-bed  radiation  Solar  energy  Gasification  Chemical  reactors Index. décimale : 536 Chaleur. Thermodynamique Résumé : A reacting packed-bed undergoing a high-temperature thermochemical solid-gas transformation is considered. The steam- and dry-gasification of carbonaceous materials to syngas is selected as the model reaction. The exact 3D digital geometrical representation of the packed-bed is obtained by computer tomography and used in direct pore-level simulations to characterize its morphological and radiative transport properties as a function of the reaction extent. Two-point correlation functions and mathematical morphology operations are applied to calculate porosities, specific surfaces, particle-size distributions, and representative elementary volumes. The collision-based Monte Carlo method is applied to determine the probability distribution of attenuation path length and direction of incidence at the solid-fluid boundary, which are linked to the extinction coefficient, scattering phase function, and scattering albedo. These effective properties can be then incorporated in continuum models of the reacting packed-bed. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

Tomography-based determination of effective transport properties for reacting porous media / Sophia Haussener in Journal of heat transfer, Vol. 134 N° 1 (Janvier 2012) 

Public ISBD [article]  in Journal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 08 p. Titre : Tomography-based determination of effective transport properties for reacting porous media Type de document : texte imprimé Auteurs : Sophia Haussener, Auteur ; Iwan Jerjen, Auteur ; Peter Wyss, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Chemically  reactive  flow  Computerised  tomography  Convection  Finite  volume  methods  Flow  simulation  Flow  through  porous  media  Fuel  gasification  Mass  transfer  Porosity  Pyrolysis  Solid-vapour  transformations  Thermochemistry  Two-phase  flow Index. décimale : 536 Chaleur. Thermodynamique Résumé : The effective heat and mass transport properties of a porous packed bed of particles undergoing a high-temperature solid–gas thermochemical transformation are determined. The exact 3D geometry of the reacting porous media is obtained by high-resolution computed tomography. Finite volume techniques are applied to solve the governing conservation equations at the pore-level scale and to determine the effective transport properties as a function of the reaction extent, namely, the convective heat transfer coefficient, permeability, Dupuit–Forchheimer coefficient, tortuosity, and residence time distributions. These exhibit strong dependence on the bed morphological properties (e.g., porosity, specific surface area, particle size) and, consequently, vary with time as the reaction progresses. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...] [article] Tomography-based determination of effective transport properties for reacting porous media [texte imprimé] / Sophia Haussener, Auteur ; Iwan Jerjen, Auteur ; Peter Wyss, Auteur . - 2012 . - 08 p. Heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 08 p. Mots-clés : Chemically  reactive  flow  Computerised  tomography  Convection  Finite  volume  methods  Flow  simulation  Flow  through  porous  media  Fuel  gasification  Mass  transfer  Porosity  Pyrolysis  Solid-vapour  transformations  Thermochemistry  Two-phase  flow Index. décimale : 536 Chaleur. Thermodynamique Résumé : The effective heat and mass transport properties of a porous packed bed of particles undergoing a high-temperature solid–gas thermochemical transformation are determined. The exact 3D geometry of the reacting porous media is obtained by high-resolution computed tomography. Finite volume techniques are applied to solve the governing conservation equations at the pore-level scale and to determine the effective transport properties as a function of the reaction extent, namely, the convective heat transfer coefficient, permeability, Dupuit–Forchheimer coefficient, tortuosity, and residence time distributions. These exhibit strong dependence on the bed morphological properties (e.g., porosity, specific surface area, particle size) and, consequently, vary with time as the reaction progresses. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...]