Measurement of dynamic liquid distributions in a fixed bed using electrical capacitance tomography and capacitance wire-mesh sensor / Bartosz Matusiak in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2070–2077 Titre : Measurement of dynamic liquid distributions in a fixed bed using electrical capacitance tomography and capacitance wire-mesh sensor Type de document : texte imprimé Auteurs : Bartosz Matusiak, Auteur ; Marco Jose da Silva, Auteur ; Uwe Hampel, Auteur Année de publication : 2010 Article en page(s) : pp. 2070–2077 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Measurement of Dynamic  Electrical Capacitance  Tomography  Wire-Mesh Sensor  Media supply  ECT Résumé : An intricate problem associated with fixed bed operation is liquid maldistribution, which denotes the fact that the liquid does not homogeneously flow through the bed. In a comparative study we evaluated two capacitance imaging methods—capacitance wire-mesh sensor and electrical capacitance tomography (ECT)—with respect to their capability of measuring static and dynamic liquid holdup in a fixed bed. The capacitance wire-mesh sensor as an invasive instrument is able to disclose flow structures at higher spatial resolution and was therefore considered the reference instrument for liquid holdup measurement. We found that both methods predict dynamic liquid holdup in the column in a similar way with only small systematic deviation. The results therefore prove that noninvasive electrical capacitance tomography can reliably measure cross-sectional dynamic liquid holdup in a fixed bed, even with a simple and fast linear back projection reconstruction algorithm. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/toc/IECRED/49/5 [article] Measurement of dynamic liquid distributions in a fixed bed using electrical capacitance tomography and capacitance wire-mesh sensor [texte imprimé] / Bartosz Matusiak, Auteur ; Marco Jose da Silva, Auteur ; Uwe Hampel, Auteur . - 2010 . - pp. 2070–2077. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2070–2077 Mots-clés : Measurement of Dynamic  Electrical Capacitance  Tomography  Wire-Mesh Sensor  Media supply  ECT Résumé : An intricate problem associated with fixed bed operation is liquid maldistribution, which denotes the fact that the liquid does not homogeneously flow through the bed. In a comparative study we evaluated two capacitance imaging methods—capacitance wire-mesh sensor and electrical capacitance tomography (ECT)—with respect to their capability of measuring static and dynamic liquid holdup in a fixed bed. The capacitance wire-mesh sensor as an invasive instrument is able to disclose flow structures at higher spatial resolution and was therefore considered the reference instrument for liquid holdup measurement. We found that both methods predict dynamic liquid holdup in the column in a similar way with only small systematic deviation. The results therefore prove that noninvasive electrical capacitance tomography can reliably measure cross-sectional dynamic liquid holdup in a fixed bed, even with a simple and fast linear back projection reconstruction algorithm. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/toc/IECRED/49/5

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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]  inIndustrial & 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

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