Analyse de la distribution de la rétention dynamique de liquide dans une colonne gaz-liquide à garnissage par tomographie à rayons X

in Latifi, R.; Boudrant, J.; Tondeur, D. (Eds.) Récents Progrès en Génie des procédés - N°82 - Information, Modélisation, Simulation et Optimisation - Actes du 8ème Congrès de la Société française de Génie des Procédés, 17-19 octobre 2001, Nancy, France (2001)

Utilisation de la tomographie électrique résistive en vue de la caractérisation du fonctionnement d'une colonne à bulles

in Latifi, R.; Boudrant, J.; Tondeur, D. (Eds.) Récents Progrès en Génie des procédés - N°82 - Information, Modélisation, Simulation et Optimisation - Actes du 8ème Congrès de la Société française de Génie des Procédés, 17-19 octobre 2001, Nancy, France (2001)

Analysis of electrical resistance tomography measurements obtained on a bubble column

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 ▲]

Liquid holdup distribution in a corrugated sheet structured packing measured by X-ray tomography

in Chemie Ingenieur Technik (2001), 73

Imaging liquid distribution on Mellapak 250Y structured packing by X-ray tomography

Conference (2000)

A compartimentalized model for trickle flow through packed beds based on x-ray tomograms

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)

Modelling of the liquid distribution in a trickle flow packed column based upon X-ray tomography images

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 ▲]

Local measurements of void fraction and liquid holdup in packed columns using X-ray computed tomography

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 ▲]

X-ray tomography in random packings

Scientific conference (1997, September 30)

Modelling of the liquid distribution in a packed column based upon X-ray tomography images

Conference (1997)