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Electrical capacitance volume tomography imaging of three - dimensional flow structures and solids concentration distributions in a riser and a bend of a gas – solid circulating fluidized bed / Wang, Fei in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10968-10976 Titre : Electrical capacitance volume tomography imaging of three - dimensional flow structures and solids concentration distributions in a riser and a bend of a gas – solid circulating fluidized bed Type de document : texte imprimé Auteurs : Wang, Fei, Auteur ; Qussai Marashdeh, Auteur ; Aining Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 10968-10976 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Circulating  fluidized  bed  Fluidization  Gas  solid  Riser  Concentration  distribution  Three  dimensional  flow  Imaging  Tomography  Capacitance Résumé : Electrical capacitance volume tomography (ECVT) is a newly developed imaging technique that can quantify three-dimensional (3D) multiphase flows in a complex, geometric flow field. In this study, the 3D phase distribution images inside a gas―solid circulating fluidized bed (CFB) are obtained using ECVT. Specifically, measurements are made at a riser section and a 90° bend-shape riser exit section of the CFB. Inside the vertical riser, a symmetric core―annulus structure with a low solids holdup in the riser center along with a high solids holdup near the riser wall is observed. The average volume solids holdup and the thickness of the annulus decrease with the superficial gas velocity. A core―annulus flow structure is formed both in the vertical and horizontal parts of the bend. The annulus structure is noncentro-symmetric in the horizontal part of the bend. The solids holdup in the annulus near the top wall area in the bend is higher than that in other locations of the annulus. At a higher superficial gas velocity in the riser, the centrifugal acceleration increases due to high solids velocity in the bend, and more solids are separated to the outside of the bend from the main stream. A "reversed-S" shape solids holdup distribution along the diagonal line is also observed. The solids holdup increases and then decreases from the outer comer to the center of the bend, which indicates that a relatively dilute region is formed near the outer corner of the bend. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286471 [article] Electrical capacitance volume tomography imaging of three - dimensional flow structures and solids concentration distributions in a riser and a bend of a gas – solid circulating fluidized bed [texte imprimé] / Wang, Fei, Auteur ; Qussai Marashdeh, Auteur ; Aining Wang, Auteur . - 2012 . - pp. 10968-10976. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10968-10976 Mots-clés : Circulating  fluidized  bed  Fluidization  Gas  solid  Riser  Concentration  distribution  Three  dimensional  flow  Imaging  Tomography  Capacitance Résumé : Electrical capacitance volume tomography (ECVT) is a newly developed imaging technique that can quantify three-dimensional (3D) multiphase flows in a complex, geometric flow field. In this study, the 3D phase distribution images inside a gas―solid circulating fluidized bed (CFB) are obtained using ECVT. Specifically, measurements are made at a riser section and a 90° bend-shape riser exit section of the CFB. Inside the vertical riser, a symmetric core―annulus structure with a low solids holdup in the riser center along with a high solids holdup near the riser wall is observed. The average volume solids holdup and the thickness of the annulus decrease with the superficial gas velocity. A core―annulus flow structure is formed both in the vertical and horizontal parts of the bend. The annulus structure is noncentro-symmetric in the horizontal part of the bend. The solids holdup in the annulus near the top wall area in the bend is higher than that in other locations of the annulus. At a higher superficial gas velocity in the riser, the centrifugal acceleration increases due to high solids velocity in the bend, and more solids are separated to the outside of the bend from the main stream. A "reversed-S" shape solids holdup distribution along the diagonal line is also observed. The solids holdup increases and then decreases from the outer comer to the center of the bend, which indicates that a relatively dilute region is formed near the outer corner of the bend. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286471