References of "Marchot, Pierre"
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See detailSimple heuristic model of an aerosol filter
Lecocq, Rapahaël; Calvo, Sébastien ULg; Saroha, Anil et al

Poster (2006)

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See detailLiquid flow distribution in catalytic distillation columns : use of high-energy X-ray tomography
Aferka, Saïd ULg; Saroha, Anil; Toye, Dominique ULg et al

in AIChE (Ed.) AIChE Annual Meeting, Conference Proceedings, San Francisco, CA, United States, Nov. 12-17, 2006 (2006)

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See detailEtude du colmatage dans un bioréacteur membranaire à recirculation externe utilisé en nitrification partielle
Kouakou, Edouard; Pirard, Jean-Paul ULg; Marchot, Pierre ULg et al

in Proceedings of MEMPRO 3 - Intégration des membranes dans les procédés (2006)

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See detailInfluence of operating parameters on nitrite
Kouakou, Edouard; Salmon, Thierry ULg; Marchot, Pierre ULg et al

in Proceeding of the International Symposium on Environmental Biotechnology (2006)

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See detailGas-liquid mass transfer in a circulating jet-loop nitrifying MBR
Kouakou, Edouard; Salmon, Thierry ULg; Toye, Dominique ULg et al

in Chemical Engineering Science (2005), 60(22 Sp. Iss. SI), 6346-6353

Based on airlift configuration, a novel circulating jet-loop submerged membrane bioreactor (JLMBR) adapted to ammonium partial oxidation has been developed. Membrane technology and combined air and water ... [more ▼]

Based on airlift configuration, a novel circulating jet-loop submerged membrane bioreactor (JLMBR) adapted to ammonium partial oxidation has been developed. Membrane technology and combined air and water forced circulation are adopted to obtain a high biomass retention time and to achieve a separate control of mixing and aeration. This study is intended to determine how gas-liquid mass transfer is affected by operating conditions. In a first approximation, liquid was assumed to be perfectly mixed. A classical non-steady state clean water test, known as the "gas out-gas in" method, was used to determine the gas-liquid mass transfer coefficient k(L)a. Air and recirculated liquid superficial velocities were gradually increased from 0.013 to 0.019m s(-1) and 0.0056 to 0.011 m s(-1), respectively. Subsequently, the gas-liquid mass transfer coefficient kLa varied from 0.01 to 0.02 s(-1). It appears to be influenced by the combined action of air and recirculated liquid flowrates in the range 0.72-1.03N m(3) h(-1) and 0.30-0.58 m(3) h(-1), respectively, for air and liquid. Correlations are proposed to describe this double influence. Experiments were performed on tap water and a culture medium used for the autotrophic growth of nitrifying bacteria, respectively. Oxygen transfer appeared to be not significantly affected by the mineral salt (0.48 g 1(-1)) encountered in this medium. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailAnalysis of gas holdup in bubble columns with non-Newtonian fluid using electrical resistance tomography and dynamic gas disengagement technique
Fransolet, E.; Crine, A.; Marchot, Pierre ULg et al

in Chemical Engineering Science (2005), 60(22 Sp. Iss. SI), 6118-6123

This paper presents an experimental analysis of the influence of the liquid rheology on the gas flow pattern in a bubble column reactor. Aqueous solutions of xanthan are selected as an example of non ... [more ▼]

This paper presents an experimental analysis of the influence of the liquid rheology on the gas flow pattern in a bubble column reactor. Aqueous solutions of xanthan are selected as an example of non-Newtonian shear thinning fluid. Averaged gas holdup is determined by two experimental techniques: parietal pressure probes and electrical resistance tomography (ERT). ERT is also used to provide 2D images of the gas phase distribution in a column cross-section. Bubble size distributions are evaluated by a gas disengagement technique using the parietal pressure probes. All these techniques clearly show the gas flow pattern is different in Newtonian and non-Newtonian fluids. Gas holdup values decrease when increasing the liquid viscosity and reach a minimum or a plateau. Homogeneous flow regime, observed in water at low gas velocities, tends to disappear when viscosity increases. This evolution is visualized by a much less isotropic distribution of the gas phase within cross-section of the column and by the appearance of much larger bubbles due to an increased coalescence phenomenon. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailImaging of liquid distribution in reactive distillation packings with a new high-energy x-ray tomograph
Toye, Dominique ULg; Crine, Michel ULg; Marchot, Pierre ULg

in Measurement Science & Technology (2005), 16(11), 2213-2220

We describe a new, high-energy (420 kV), large-scale (0.45 m in diameter, 4 m in height) x-ray tomograph developed to investigate gas and liquid flow through fixed bed like absorption, distillation and ... [more ▼]

We describe a new, high-energy (420 kV), large-scale (0.45 m in diameter, 4 m in height) x-ray tomograph developed to investigate gas and liquid flow through fixed bed like absorption, distillation and reactive distillation columns. The first results obtained with this set-up on test objects (physical phantoms), such as a cylindrical container filled with water or a large diameter structured metallic packing, validate the technique as a quantitative tool for geometrical measurements. Very detailed two-dimensional (21)) and three-dimensional (3D) images of a 0.09 m diameter KATAPAK-SP 12, a reactive distillation packing, are presented. Quantitative information relative to liquid hold-up distribution may be obtained from tomographic imaging performed on an irrigated column packed with this element. [less ▲]

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See detailAnalyse quantitative de la texture poreuse d'un matériau polymère cellulaire basée sur des images de microtomographie à rayons X
Lecocq, Raphaël; Toye, Dominique ULg; Maquet, Véronique et al

Poster (2005, October)

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See detailÉtude de la texture poreuse d'un matériau polymère cellulaire utilisé en ingénierie tissulaire par microtomographie à rayons X
Lecocq, Raphaël; Toye, Dominique ULg; Maquet, Véronique et al

Poster (2005, October)

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See detailImage analysis of X-ray microtomograms of soft materials during convective drying: 3D measurements
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in Journal of Microscopy-Oxford (2005), 218(Pt 3), 247-252

Drying dewatered sludge leads to a complex three-dimensional porous structure. Moreover, this operation is dependent on the way the material is processed. In this study, textural changes of sludge ... [more ▼]

Drying dewatered sludge leads to a complex three-dimensional porous structure. Moreover, this operation is dependent on the way the material is processed. In this study, textural changes of sludge extrudates submitted to convective drying are followed by a 3D image analysis of reconstructed X-ray microtomograms. To achieve this goal, two different wastewater sludges collected in wastewater treatment plant after the thickening step and dewatered in the laboratory are used. It is showed that the evolution of the 3D-crack ratio vs. the residual water content evolves following a hyperbolic law. The 3D opening crack size distribution reveals two different types of pore development, i.e. a continuous pore size evolution for one sludge and the sudden appearance of cracks for the other sludge. [less ▲]

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See detailMoisture profiles determination during convective drying using x-ray microtomography
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in Canadian Journal of Chemical Engineering (2005), 83(1), 127-131

The knowledge of internal moisture profiles which develop during drying is essential for model validation purposes, but they are difficult to determine experimentally. This paper shows that X-ray ... [more ▼]

The knowledge of internal moisture profiles which develop during drying is essential for model validation purposes, but they are difficult to determine experimentally. This paper shows that X-ray microtomography, together with image analysis, provides an accurate, non destructive and easy to use technique to determine moisture profiles. Results reported concern the drying of wastewater sludges whose management is becoming a real environmental challenge. An analysis of the development of moisture gradients at the sample external wall shows an influence of drying operating conditions. Finally, mass diffusion coefficients are estimated from the knowledge of both the moisture gradients and the drying flux. [less ▲]

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See detailMass transfer, mixing and gas hold-up in a circulating jet-loop nitrifying MBR
Kouakou, Edouard; Salmon, Thierry ULg; Toye, Dominique ULg et al

in Proceedings of 7th World Congress of Chemical Enginnering - WCCE7, Glasgow, Scotland, 10-14 July 2005 (2005)

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See detailIntegrated adsorbent and process characterization. Application to air separation PSA processes
Khoder Agha, R.; De Weireld, Guy; Frère, Marc et al

Conference (2005)

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See detailHigh energy, high resolution x-ray tomography applied to catalytic distillation packings
Toye, Dominique ULg; Le Trong, Emmanuel; Marchot, Pierre ULg et al

Conference (2005)

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See detailTransfert de matière gaz-liquide et mélange dans un réacteur membranaire à recirculation interne
Kouakou, Edouard; Salmon, Thierry ULg; Fransolet, Emmanuelle et al

in Azzaro-Pantel, C.; Bertrand, J.; Cabassud, M. (Eds.) et al Récents Progrès en Génie des procédés - N°92 - Le Génie des Procédés vers de nouveaux espaces, Actes du 10ème Congrès de la Société Française de Génie des Procédés, 20-22 septembre 2005, Toulouse, France (2005)

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See detail3D imaging of reactive distillation packings with a new high energy x-ray tomograph
Toye, Dominique ULg; Abdullah, J. D.; Crine, Michel ULg et al

in Jong, A.; Takei, M.; William, R. A. (Eds.) et al Proceedings of 4th World Congress in Industrial Process Tomography (WCIPT4), Aizu, Japan, 5-8 septembre 2005 (2005)

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See detailEvolution de l'écoulement de fluides non-newtoniens avec le temps d'agitation en cuve agitée par vélocimétrie par images de particules
Fransolet, Emmanuelle; Marchot, Pierre ULg; Toye, Dominique ULg et al

in SFGP (Ed.) Récents Progrès en Génie des procédés - N°92 - Le Génie des Procédés vers de nouveaux espaces, Actes du 10ème Congrès de la Société Française de Génie des Procédés, 20-22 septembre 2005, Toulouse, France (2005)

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