Computed X-ray tomography investigations in packed beds

Scientific conference (2004, August)

Image analysis of X-ray microtomograms of Pd-Ag/SiO2 xerogel catalysts supported on Al2O3 foams

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2004), 241(1-mars Sp. Iss. SI), 201-206

In order to preshape and mechanically strengthen, Pd-Ag/SiO2 xerogel catalysts were carried out in Al2O3 foams (pore-sizes similar to40 mum). The final material consists of a Pd-Ag/SiO2 xerogel ... [more ▼]

In order to preshape and mechanically strengthen, Pd-Ag/SiO2 xerogel catalysts were carried out in Al2O3 foams (pore-sizes similar to40 mum). The final material consists of a Pd-Ag/SiO2 xerogel immobilized in the open cells of the alumina foam. The localization of the xerogel catalyst in alumina foams of various pore structure was studied by X-ray microtomography. The three-dimensional (3D) porous structure was reconstructed from the consecutive cross-sections obtained by this technique. Total porosity, porous density distribution, and pore-size distribution were determined by image analysis on the free and impregnated supports. Our results show that the success of the used impregnation technique depends on the pore structure of the support. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

Apports de la microtomographie à rayons X pour l'étude du séchage convectif de matériaux déformables : suivi du retrait, de la fissuration et des profils d'humidité interne

Scientific conference (2004, March)

Visualisation de l'écoulement d'un fluide Non-Newtonien en cuve agitée par Vélocimétrie par Images de Particules : influence du temps de mélange

Poster (2004)

Flow Pattern Evolution With Time Mixing Of Non-Newtonian Fluid In A Stirred Tank Using Particle Image Velocimetry

in American Society of Mechanical Engineering (ASME) (Ed.) Proccedings of 7th Biennal ASME Conference, Engineering Systems Design and Analysis – ESDA 2004, Manchester, United Kingdom,19 – 22 July 2004 (2004)

Image analysis of X-ray microtomograms of soft materials during convective drying

in Journal of Microscopy (2003), 212(Pt 2), 197-204

X-ray microtomography is used to explore the textural evolution that soft materials undergo during a drying treatment. An original image processing algorithm is applied to vertical projections and ... [more ▼]

X-ray microtomography is used to explore the textural evolution that soft materials undergo during a drying treatment. An original image processing algorithm is applied to vertical projections and reconstructed cross-section images in order to quantify the texture at different stages of drying. Measurements are performed both on grey-level and on binary images. It is shown that X-ray microtomography is a very promising tool in the field of drying investigations. It can be used to determine internal moisture profiles, and to follow crack development and shrinkage in an accurate and non-destructive way. This information is crucial to validate drying models. Waste-water sludges are used as test materials to assess the validity of the proposed methodology. The management of these sludges, often including a drying stage, will become a challenge in the forthcoming years in accordance with environmental regulations. Samples collected in two waste-water treatment plants are investigated. Their analysis by X-ray microtomography brings to the fore two different drying behaviours, illustrating that sludge drying is a complex unit operation very sensitive to the way the material is produced. [less ▲]

Convective drying of wastewater sludges: Influence of air temperature, superficial velocity and humidity on the kinetics

in Pakowski, Zdzislaw (Ed.) X Drying Symposium, Lodz, 17-19 September 2003 (2003, September)

Application of X-ray microtomography to follow cracks development during convective drying of deformable materials

Poster (2003, September)

Moisture profiles determination during convective drying using X-ray microtomography

in Proceedings of the 3rd World Congress on Industrial Process Tomography, Banff, Canada (2003, September)

Data fusion between X-ray computed tomography and electrical capacitance tomography images obtained on an absorption columns

Conference (2003)