Documents disponibles écrits par cet auteur

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

Studies of the interaction of ionic liquid and gas in a small-diameter bubble column / R. Kaji in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7938–7944 Titre : Studies of the interaction of ionic liquid and gas in a small-diameter bubble column Type de document : texte imprimé Auteurs : R. Kaji, Auteur ; D. Zhao, Auteur ; P. Licence, Auteur Année de publication : 2009 Article en page(s) : pp. 7938–7944 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas  bubbling  Ionic  liquid Résumé : Gas bubbling through a column of ionic liquid has been investigated using high-speed video and a conductivity method to measure a cross-sectionally averaged void fraction. For comparison, other liquids with similar physical properties, e.g., a glycerol/water mixture and glycerol/water with dissolved potassium chloride, were also employed. Air was used for the gas phase. The similarities and differences of flow characteristics were observed from the images. The differences in flow patterns were revealed by analysis of the time series of conductance signals in the form of the probability density function, autocorrelation, and power spectrum density. Furthermore, the velocities and frequencies of flow structures were deduced. The flow characteristics of ionic liquid were found to be similar to those of the other liquids studied. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014439 [article] Studies of the interaction of ionic liquid and gas in a small-diameter bubble column [texte imprimé] / R. Kaji, Auteur ; D. Zhao, Auteur ; P. Licence, Auteur . - 2009 . - pp. 7938–7944. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7938–7944 Mots-clés : Gas  bubbling  Ionic  liquid Résumé : Gas bubbling through a column of ionic liquid has been investigated using high-speed video and a conductivity method to measure a cross-sectionally averaged void fraction. For comparison, other liquids with similar physical properties, e.g., a glycerol/water mixture and glycerol/water with dissolved potassium chloride, were also employed. Air was used for the gas phase. The similarities and differences of flow characteristics were observed from the images. The differences in flow patterns were revealed by analysis of the time series of conductance signals in the form of the probability density function, autocorrelation, and power spectrum density. Furthermore, the velocities and frequencies of flow structures were deduced. The flow characteristics of ionic liquid were found to be similar to those of the other liquids studied. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014439