scholarly journals Tomography-Based Determination of Effective Transport Properties for Reacting Porous Media

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Sophia Haussener ◽  
Iwan Jerjen ◽  
Peter Wyss ◽  
Aldo Steinfeld
Keyword(s):  
Porous Media ◽  
Transport Properties ◽  
Strong Dependence ◽  
Convective Heat Transfer Coefficient ◽  
Packed Bed ◽  
Morphological Properties ◽  
High Resolution Computed Tomography ◽  
Thermochemical Transformation ◽  
Effective Transport ◽  
Reaction Extent

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.

scholarly journals Tomography-Based Determination of Effective Transport Properties for Reacting Porous Media

2010 ◽  
Author(s):  
Sophia Haussener ◽  
Iwan Jerjen ◽  
Peter Wyss ◽  
Aldo Steinfeld
Keyword(s):  
Porous Media ◽  
Transport Properties ◽  
Strong Dependence ◽  
Convective Heat Transfer Coefficient ◽  
Packed Bed ◽  
Morphological Properties ◽  
Thermochemical Transformation ◽  
Effective Transport ◽  
Reaction Extent ◽  
Level Scale

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 computer 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.

scholarly journals Tomography-Based Analysis of Radiative Transfer in Reacting Packed Beds Undergoing a Solid-Gas Thermochemical Transformation

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Sophia Haussener ◽  
Wojciech Lipiński ◽  
Peter Wyss ◽  
Aldo Steinfeld
Keyword(s):  
Effective Properties ◽  
Packed Bed ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Thermochemical Transformation ◽  
Reaction Extent ◽  
Fluid Boundary ◽  
Point Correlation ◽  
Scattering Phase ◽  
Scattering Phase Function

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.

Estimation of Effective Transport Properties in Packed Bed Reactors

1980 ◽  
Vol 22 (3) ◽  
pp. 431-483 ◽  
Author(s):  
B. D. Kulkarni ◽  
L. K. Doraiswamy
Keyword(s):  
Transport Properties ◽  
Packed Bed ◽  
Packed Bed Reactors ◽  
Effective Transport

scholarly journals Tomography-Based Analysis of Radiative Transfer in Reacting Packed Beds Undergoing a Solid-Gas Thermochemical Transformation

2009 ◽  
Author(s):  
Sophia Haussener ◽  
Wojciech Lipin´ski ◽  
Peter Wyss ◽  
Aldo Steinfeld
Keyword(s):  
Effective Properties ◽  
Packed Bed ◽  
Steam Gasification ◽  
Domain Modeling ◽  
Thermochemical Transformation ◽  
Reaction Extent ◽  
Fluid Boundary ◽  
Point Correlation ◽  
Scattering Phase ◽  
Scattering Phase Function

A reacting packed bed undergoing a high-temperature thermochemical solid-gas transformation is considered. The steam-gasification of carbonaceous materials into syngas is selected as the model reaction. The exact 3D geometrical configuration of the packed bed is obtained by computer tomography, digitalized, 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 albedo. These effective properties can then be incorporated in continuum domain modeling of the packed bed.

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