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Comparison between electrical capacitance tomography and wire mesh sensor output for air/silicone oil flow in a vertical pipe / B. J. Azzopardi in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8805–8811 Titre : Comparison between electrical capacitance tomography and wire mesh sensor output for air/silicone oil flow in a vertical pipe Type de document : texte imprimé Auteurs : B. J. Azzopardi, Auteur ; L. A. Abdulkareem, Auteur ; D. Zhao, Auteur Année de publication : 2010 Article en page(s) : pp. 8805–8811 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Tomographic  techniques Résumé : Two tomographic techniques have been applied simultaneously to the flow of air and silicone oil in 67 mm internal diameter vertical pipe. A twin plane electrical capacitance tomgraphy (ECT) electrode system driven by Tomoflow electronics was positioned below a new capacitance wire mesh sensor (WMS) system. The former used 8 electrodes around the pipe in each plane, the latter employed two arrays of 24 evenly spaced wires stretched over the pipe cross-section. The ECT measurement was triggered from the WMS electronics. High speed videos were also taken simultaneously through the transparent pipe wall. Gas superficial velocities of 0.05−5.5 m/s and liquid superficial velocities of 0−0.7 m/s were studied. These gave bubbly, slug, and churn flow in the pipe. The outputs of the two techniques have been compared at a number of levels. At its most basic, the time averaged cross-sectionally averaged void fractions were compared. They showed excellent agreement. At the next level, the time series of the cross-sectionally averaged void fraction were considered directly and through their variations in amplitude and frequency space. Examples of probability density functions are presented. Radial variations of the void fraction were also considered. Thereafter the shapes of the large bubbles and the velocities of periodic structures are presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901949z [article] Comparison between electrical capacitance tomography and wire mesh sensor output for air/silicone oil flow in a vertical pipe [texte imprimé] / B. J. Azzopardi, Auteur ; L. A. Abdulkareem, Auteur ; D. Zhao, Auteur . - 2010 . - pp. 8805–8811. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8805–8811 Mots-clés : Tomographic  techniques Résumé : Two tomographic techniques have been applied simultaneously to the flow of air and silicone oil in 67 mm internal diameter vertical pipe. A twin plane electrical capacitance tomgraphy (ECT) electrode system driven by Tomoflow electronics was positioned below a new capacitance wire mesh sensor (WMS) system. The former used 8 electrodes around the pipe in each plane, the latter employed two arrays of 24 evenly spaced wires stretched over the pipe cross-section. The ECT measurement was triggered from the WMS electronics. High speed videos were also taken simultaneously through the transparent pipe wall. Gas superficial velocities of 0.05−5.5 m/s and liquid superficial velocities of 0−0.7 m/s were studied. These gave bubbly, slug, and churn flow in the pipe. The outputs of the two techniques have been compared at a number of levels. At its most basic, the time averaged cross-sectionally averaged void fractions were compared. They showed excellent agreement. At the next level, the time series of the cross-sectionally averaged void fraction were considered directly and through their variations in amplitude and frequency space. Examples of probability density functions are presented. Radial variations of the void fraction were also considered. Thereafter the shapes of the large bubbles and the velocities of periodic structures are presented. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901949z

Flow patterns: does gas/solids flow pattern correspond to churn flow in gas/liquid flow / B. J. Azzopardi in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7934-7939 Titre : Flow patterns: does gas/solids flow pattern correspond to churn flow in gas/liquid flow Type de document : texte imprimé Auteurs : B. J. Azzopardi, Auteur Année de publication : 2008 Article en page(s) : P. 7934-7939 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas/solids  flow  Electrical  capacitance  tomography  Probability  density  functions  velocity Résumé : The output of electrical capacitance tomography measurements of gas/solids flow in a vertical pipe have been analyzed to extract flow pattern information. Two approaches already used for gas/liquid flows were employed. One uses the shape of the probability density functions of the cross-sectionally averaged gas fraction time series. The other considered the velocities of periodic structures, i.e., pulses of particles. The results from both techniques showed that a flow pattern similar to churn flow in gas/liquid flow was indicated. When the gas/solids flow rates are plotted on a gas/liquid flow pattern map, they fell in the churn flow region. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800868b [article] Flow patterns: does gas/solids flow pattern correspond to churn flow in gas/liquid flow [texte imprimé] / B. J. Azzopardi, Auteur . - 2008 . - P. 7934-7939. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7934-7939 Mots-clés : Gas/solids  flow  Electrical  capacitance  tomography  Probability  density  functions  velocity Résumé : The output of electrical capacitance tomography measurements of gas/solids flow in a vertical pipe have been analyzed to extract flow pattern information. Two approaches already used for gas/liquid flows were employed. One uses the shape of the probability density functions of the cross-sectionally averaged gas fraction time series. The other considered the velocities of periodic structures, i.e., pulses of particles. The results from both techniques showed that a flow pattern similar to churn flow in gas/liquid flow was indicated. When the gas/solids flow rates are plotted on a gas/liquid flow pattern map, they fell in the churn flow region. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800868b