References of "L'Homme, Guy"
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See detailLiquid distribution images on structured packing by X-ray computed tomography
Marchot, Pierre ULg; Toye, Dominique ULg; Pelsser, A. M. et al

in AIChE Journal (2001), 47(6), 1471-1476

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See detailAnalysis of electrical resistance tomography measurements obtained on a bubble column
Fransolet, E.; Crine, Michel ULg; L'Homme, Guy ULg et al

in Measurement Science & Technology (2001), 12(8), 1055-1060

Measurements of gas hold-up obtained by using pressure transducers and an optical probe are compared with those obtained by an electrical resistance tomography method. The use of a neural network, the ... [more ▼]

Measurements of gas hold-up obtained by using pressure transducers and an optical probe are compared with those obtained by an electrical resistance tomography method. The use of a neural network, the input of which is the electrical measurements, can lead to quantitative results for the gas hold-up distribution. An interesting qualitative diagnosis of the sparger functioning is observed from reconstructed images. [less ▲]

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See detailBubble-columns : local gas holdup determination by electrical resistance tomography
Fransolet, Emmanuelle; Crine, Michel ULg; L'Homme, Guy ULg et al

in Chemie Ingenieur Technik (2001), 73

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See detailA compartimentalized model for trickle flow through packed beds based on x-ray tomograms
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Flamand, G. (Ed.) Récents Progrès en Génie des procédés - N°69 - Tools fro process understanding and control - Proceedings of the 2nd European Congress on Chemical Engineering – ECCE2, 05 – 07 octobre 1999, Montpellier, France (1999)

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See detailInvestigation on liquid maldistribution in packed beds by X-ray tomography
Marchot, Pierre ULg; Toye, Dominique ULg; Crine, Michel ULg et al

in Chemical Engineering Research & Design : Transactions of the Institution of Chemical Engineers Part A (1999), 77

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See detailModelling of the liquid distribution in a trickle flow packed column based upon X-ray tomography images
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Chemical Engineering Communications (1999), 175

X-ray tomography is used to characterise the liquid distribution in a 0.6 meter diameter and 2 meter height column filled with gas-liquid absorption polypropylene packing elements (Cascade Mini-Ring 1A ... [more ▼]

X-ray tomography is used to characterise the liquid distribution in a 0.6 meter diameter and 2 meter height column filled with gas-liquid absorption polypropylene packing elements (Cascade Mini-Ring 1A, Glitsch Benelux). The liquid holdup distribution is determined for liquid flowrates ranging from 1000 l/h to 6000 l/h, that correspond to superficial velocities ranging from 10(-3) to 6 10(-3) m/s, in several cross sections situated at different heights in the packed column. A characteristic length, corresponding to the smallest scale beyond which the packing properties may be supposed statistically homogenous and isotropic, as determined by Means of the autocorrelation function method applied to the images of the solid distribution. Both local and global liquid holdup measurements are satisfactorily modelled by means of a partial wetting model based on a probabilistic approach. [less ▲]

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See detailLocal measurements of void fraction and liquid holdup in packed columns using X-ray computed tomography
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Chemical Engineering & Processing (1998), 37(6), 511-520

A 'tailor made' computed X-ray tomographic scanner has been developed as a tool for the analysis of the distribution of gas, liquid and solid phases in packed columns. The very good spatial resolution of ... [more ▼]

A 'tailor made' computed X-ray tomographic scanner has been developed as a tool for the analysis of the distribution of gas, liquid and solid phases in packed columns. The very good spatial resolution of the scanner has first been assessed by the imaging of objects of known shape and size, called 'physical' phantoms. Images have then been realized on a 0.6 m diameter and 2 m height column packed with Cascade Mini-Ring 1A packing elements, which is a random polypropylene packing designed to be used in absorption columns. The solid phase distribution, leading to the void fraction distribution, has been analyzed on cross-section images of the dry packed column (without any liquid flowrate). The measured value of the bed void fraction is equal to the value provided by the manufacturer. The analysis of the axial profile of void fraction shows that the 'end effect' may be neglected, whereas the analysis of the radial profile evidences the existence of a non negligible 'wall effect'. Images have then been carried out on the packed column irrigated by a liquid flowrate ranging between 0 and 6000 1 h(-1) (0-6.10(-3) m s(-1)). Hold-up values have been measured in different cross-sections of the column and averaged in order to obtain the total hold-up value in the bed. The computed values are in very good agreement with those reported in the literature for similar packing. The dependence of the liquid hold-up on the liquid superficial velocity can be expressed in terms of a power law. The fitted value of the exponent, equal to 0.65, is in the range of exponent values found in correlations of the literature. (C) 1998 Elsevier Science S.A. All rights reserved. [less ▲]

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See detailInvestigating trickle flow in packed columns by X-ray tomography
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

Conference (1997, October)

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See detailTriblock copolymer based thermoreversible gels. 2. Analysis of the sol-gel transition
Yu, Jian Ming; Dubois, Philippe ULg; Teyssié, Philippe et al

in Macromolecules (1996), 29(16), 5384-5391

Syndiotactic poly(methyl methacrylate) (sPMMA)−polybutadiene (PBD)−sPMMA triblock copolymers of various chemical compositions and different molecular weights have been studied in the presence of o-xylene ... [more ▼]

Syndiotactic poly(methyl methacrylate) (sPMMA)−polybutadiene (PBD)−sPMMA triblock copolymers of various chemical compositions and different molecular weights have been studied in the presence of o-xylene, which is a selective solvent for the central PBD block. Thermoreversible gels can be formed in a suitable curing temperature range (<35 °C) and at a high enough concentration (>1 wt %). The time dependence of the storage (G‘) and the loss (G‘‘) moduli has been measured in a frequency range of 0.08−1 Hz. The static and dynamic properties of the gels have been discussed on the basis of the scaling theory. At the gel point, where the loss angle (tan δc = G‘‘/G‘) is independent of frequency, typical power laws G‘(ω) G‘‘(ω) ωΔ have been observed. The scaling exponent Δ has been found equal to 0.70 ± 0.02 independently of the PBD and PMMA molecular weight, i.e., 36 000 < Mn (PBD) < 100 000 and 20 000 < Mn (PMMA) < 51 000. This exponent is also independent of the copolymer concentration and temperature in the investigated range, i.e., 2−7 wt % and 8−24 °C, respectively. This value of Δ agrees with theoretical predictions as well as with experimental values reported for some chemical gels; it is however different from the experimental values published for most physical gels. A PBD−PMMA diblock copolymer also forms a gel in o-xylene, although at higher concentration and lower temperature compared to the parent triblock copolymer. The scaling exponent Δ is then somewhat smaller, i.e., 0.61. [less ▲]

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See detailComputer-assisted tomography for liquid imaging in trickle-flow columns
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Non-invasive Monitoring of Multiphase Flows (1996)

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See detailModelling of multiphase flow in packed beds by computer-assisted x-ray tomography
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Measurement Science & Technology (1996), 7(3), 436-443

The high resolution which can be obtained by computer-assisted x-ray tomography is used to investigate Various scale heterogeneities of the flow texture characterizing multiphase flow in packed beds. The ... [more ▼]

The high resolution which can be obtained by computer-assisted x-ray tomography is used to investigate Various scale heterogeneities of the flow texture characterizing multiphase flow in packed beds. The direct counting of 'irrigated' pixels allows the determination of the number of individual liquid rivulets as well as their size. The evolution of the liquid flow texture versus the liquid velocity agrees quite well with the predictions of a percolation-based model. This agreement is further confirmed by the comparison of the experimental hold-up values averaged over the column cross-section with the theoretical model. [less ▲]

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