Documents disponibles écrits par cet auteur

Measurement of liquid distributions in particle packings using wire - mesh sensor versus transmission tomographic imaging / Andre Bieberle in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9445–9453 Titre : Measurement of liquid distributions in particle packings using wire - mesh sensor versus transmission tomographic imaging Type de document : texte imprimé Auteurs : Andre Bieberle, Auteur ; Markus Schubert, Auteur ; Marco Jose da Silva, Auteur Année de publication : 2010 Article en page(s) : pp. 9445–9453 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Imaging  techniques  Hydrodynamics Résumé : The paper compares two different imaging techniques for the investigation of the hydrodynamics in a laboratory packed bed reactor operating at different stationary states and with two different particle packings. The wire-mesh sensor offers cross-sectional liquid holdup distribution imaging at an ultra high speed of 10000 frames/s and good spatial resolution of 6 mm. It is therefore a very useful imaging tool for transient and periodic flow conditions. Up to now its influence on the flow in a packed bed was never analyzed. γ-ray computed tomography uses 662 keV γ photons to obtain cross-sectional phase distribution images. It offers as well a good spatial resolution of 2 mm and does not influence the flow but needs rather long scanning times. As a noninvasive technique γ-ray tomography has been used as a reference modality to evaluate the wire-mesh sensor measurements. Data from both imaging modalities are compared utilizing different analyzing models and showed good agreement. For the wire-mesh sensor only marginal intrusive effects for the specific situation were found. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100900g [article] Measurement of liquid distributions in particle packings using wire - mesh sensor versus transmission tomographic imaging [texte imprimé] / Andre Bieberle, Auteur ; Markus Schubert, Auteur ; Marco Jose da Silva, Auteur . - 2010 . - pp. 9445–9453. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9445–9453 Mots-clés : Imaging  techniques  Hydrodynamics Résumé : The paper compares two different imaging techniques for the investigation of the hydrodynamics in a laboratory packed bed reactor operating at different stationary states and with two different particle packings. The wire-mesh sensor offers cross-sectional liquid holdup distribution imaging at an ultra high speed of 10000 frames/s and good spatial resolution of 6 mm. It is therefore a very useful imaging tool for transient and periodic flow conditions. Up to now its influence on the flow in a packed bed was never analyzed. γ-ray computed tomography uses 662 keV γ photons to obtain cross-sectional phase distribution images. It offers as well a good spatial resolution of 2 mm and does not influence the flow but needs rather long scanning times. As a noninvasive technique γ-ray tomography has been used as a reference modality to evaluate the wire-mesh sensor measurements. Data from both imaging modalities are compared utilizing different analyzing models and showed good agreement. For the wire-mesh sensor only marginal intrusive effects for the specific situation were found. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100900g

Water and n-heptane volume fractions in a rotor-stator spinning disc reactor / Frans Visscher in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16670–16676 Titre : Water and n-heptane volume fractions in a rotor-stator spinning disc reactor Type de document : texte imprimé Auteurs : Frans Visscher, Auteur ; Andre Bieberle, Auteur ; Markus Schubert, Auteur Année de publication : 2012 Article en page(s) : pp. 16670–16676 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Volume  fractions  n  heptane  water  Rotor  stator Résumé : This paper presents the volume fractions of n-heptane and water measured in a rotor-stator spinning disc reactor. The volume fractions were measured using γ-ray tomography and photographic image analysis. The volume fractions were determined as a function of rotational disc speed, flow ratio, position in the reactor, and rotor material. In addition, the effect of the density difference between water and n-heptane was determined by dissolving potassium iodide in the water phase. Below a rotational disc speed of 75 rpm the volume fraction measured by tomography and photographic image analysis are within 10% deviation. For low rotational disc speeds, the n-heptane volume fraction decreases slightly with increasing rotational disc speed: the centrifugal force accelerates the larger n-heptane droplets to the center. At higher rotational disc speeds the droplets become smaller accordingly, the friction between the phases determines the flow, and the n-heptane volume fraction becomes equal to the n-heptane to total flow ratio. An increase in density difference from 0.31 to 0.79 kg dm–3 did not influence the volume fractions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301439s [article] Water and n-heptane volume fractions in a rotor-stator spinning disc reactor [texte imprimé] / Frans Visscher, Auteur ; Andre Bieberle, Auteur ; Markus Schubert, Auteur . - 2012 . - pp. 16670–16676. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16670–16676 Mots-clés : Volume  fractions  n  heptane  water  Rotor  stator Résumé : This paper presents the volume fractions of n-heptane and water measured in a rotor-stator spinning disc reactor. The volume fractions were measured using γ-ray tomography and photographic image analysis. The volume fractions were determined as a function of rotational disc speed, flow ratio, position in the reactor, and rotor material. In addition, the effect of the density difference between water and n-heptane was determined by dissolving potassium iodide in the water phase. Below a rotational disc speed of 75 rpm the volume fraction measured by tomography and photographic image analysis are within 10% deviation. For low rotational disc speeds, the n-heptane volume fraction decreases slightly with increasing rotational disc speed: the centrifugal force accelerates the larger n-heptane droplets to the center. At higher rotational disc speeds the droplets become smaller accordingly, the friction between the phases determines the flow, and the n-heptane volume fraction becomes equal to the n-heptane to total flow ratio. An increase in density difference from 0.31 to 0.79 kg dm–3 did not influence the volume fractions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301439s