Documents disponibles écrits par cet auteur

Comparison of ECVT and MR measurements of voidage in a gas-fluidized bed / D. J. Holland in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 172-181 Titre : Comparison of ECVT and MR measurements of voidage in a gas-fluidized bed Type de document : texte imprimé Auteurs : D. J. Holland, Editeur scientifique ; Q. Marashdeh, Editeur scientifique ; C. R. Müller, Editeur scientifique Année de publication : 2009 Article en page(s) : p. 172-181 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Magnetic  resonance  (MR)  Electrical  capacitance  volume  tomography  (ECVT)  Gas-fluidized Résumé : This paper reports the first quantitative comparison of magnetic resonance (MR) and electrical capacitance volume tomography (ECVT) on a 50 mm diameter gas-fluidized bed of silica−alumina catalyst support particles (dp = 58 μm). ECVT data were acquired at a temporal resolution of 12.5 ms and a nominal spatial resolution of 2.5 mm × 2.5 mm × 4.5 mm. Snapshot MR data were acquired at a temporal resolution of 26 ms and a spatial resolution of 1.9 mm × 1.9 mm in the transverse plane and 1.9 mm × 3.8 mm in the axial plane. The particles were doped with water to produce a detectable signal with MR. The two techniques are demonstrated to produce quantitatively comparable time-averaged measurements of the voidage. The bubble frequencies measured from the snapshot images using both techniques were found to be in good agreement. However, the signal intensity inside the gas bubbles was more accurate when measured with MR, and the wake structure could be more clearly resolved using MR. This was attributed to the effect of the smoothing, or point spread function, of the ECVT measurements. An initial estimate of the smoothing in the ECVT has been performed by assuming a Gaussian point spread function. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002073 [article] Comparison of ECVT and MR measurements of voidage in a gas-fluidized bed [texte imprimé] / D. J. Holland, Editeur scientifique ; Q. Marashdeh, Editeur scientifique ; C. R. Müller, Editeur scientifique . - 2009 . - p. 172-181. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 172-181 Mots-clés : Magnetic  resonance  (MR)  Electrical  capacitance  volume  tomography  (ECVT)  Gas-fluidized Résumé : This paper reports the first quantitative comparison of magnetic resonance (MR) and electrical capacitance volume tomography (ECVT) on a 50 mm diameter gas-fluidized bed of silica−alumina catalyst support particles (dp = 58 μm). ECVT data were acquired at a temporal resolution of 12.5 ms and a nominal spatial resolution of 2.5 mm × 2.5 mm × 4.5 mm. Snapshot MR data were acquired at a temporal resolution of 26 ms and a spatial resolution of 1.9 mm × 1.9 mm in the transverse plane and 1.9 mm × 3.8 mm in the axial plane. The particles were doped with water to produce a detectable signal with MR. The two techniques are demonstrated to produce quantitatively comparable time-averaged measurements of the voidage. The bubble frequencies measured from the snapshot images using both techniques were found to be in good agreement. However, the signal intensity inside the gas bubbles was more accurate when measured with MR, and the wake structure could be more clearly resolved using MR. This was attributed to the effect of the smoothing, or point spread function, of the ECVT measurements. An initial estimate of the smoothing in the ECVT has been performed by assuming a Gaussian point spread function. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002073

Electrical Capacitance Tomography - A Perspective / Q. Marashdeh in Industrial & engineering chemistry research, Vol. 47 N°10 (Mai 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3708-3719 Titre : Electrical Capacitance Tomography - A Perspective Type de document : texte imprimé Auteurs : Q. Marashdeh, Auteur ; L.-S. Fan, Auteur ; W. Warsito, Auteur Année de publication : 2008 Article en page(s) : p. 3708-3719 Langues : Anglais (eng) Mots-clés : Electrical  capacitance  tomography  (ECT) Résumé : This article describes the recent progress in research and development on electrical capacitance tomography (ECT). Specifically, the article highlights several aspects of ECT including the electrical capacitance volume tomography (ECVT), 3D sensor design, 3D neural network multicriterion image reconstruction technique (3D-NN-MOIRT), multimodal imaging based on ECT and ECVT sensors, static-charge effects and the scheme of their elimination in the ECT image reconstruction, and multiphase flow imaging applications. The multimodal capability that enables permittivity and conductivity imaging to be simultaneously conducted is illustrated. The simulation and experimental results are presented to provide quantitative and/or qualitative assessment of the significance of various ECT techniques. The employment of ECVT in conjunction with using electrical capacitance based imaging sensors is shown to represent a favorable tool for industrial multiphase flow imaging. En ligne : https://pubs.acs.org/doi/abs/10.1021/ie0713590 [article] Electrical Capacitance Tomography - A Perspective [texte imprimé] / Q. Marashdeh, Auteur ; L.-S. Fan, Auteur ; W. Warsito, Auteur . - 2008 . - p. 3708-3719. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3708-3719 Mots-clés : Electrical  capacitance  tomography  (ECT) Résumé : This article describes the recent progress in research and development on electrical capacitance tomography (ECT). Specifically, the article highlights several aspects of ECT including the electrical capacitance volume tomography (ECVT), 3D sensor design, 3D neural network multicriterion image reconstruction technique (3D-NN-MOIRT), multimodal imaging based on ECT and ECVT sensors, static-charge effects and the scheme of their elimination in the ECT image reconstruction, and multiphase flow imaging applications. The multimodal capability that enables permittivity and conductivity imaging to be simultaneously conducted is illustrated. The simulation and experimental results are presented to provide quantitative and/or qualitative assessment of the significance of various ECT techniques. The employment of ECVT in conjunction with using electrical capacitance based imaging sensors is shown to represent a favorable tool for industrial multiphase flow imaging. En ligne : https://pubs.acs.org/doi/abs/10.1021/ie0713590