Bubble characterstics in a 3-D gas-solid fluidized bed: predictions from ultra-fast x-ray tomography and twofluid model

V. Verma, J.T. Padding, N.G. Deen, J.A.M. Kuipers, M. Bieberle, F. Barthel, M. Wagner, U. Hampel

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

The bubble characteristics in a 3-D cylindrical fluidized bed have been investigated both experimentally and numerically. Experiments were performed on a 0.1 m diameter fluidized bed, with alumina oxide particles (diameter ~1 mm) as a fluidizing material. Measurements were done at a spatial resolution of 1 mm and a temporal resolution of 1000 cross-sectional images per second, using an ultrafast electron beam X-ray computed tomography (XRT) setup (Fischer and Hampel 2010). A two-fluid model using kinetic theory of granular flow (Verma et al., 2013) was used to predict the bed dynamics numerically. The equivalent bubble diameter as a function of height is in close agreement with Darton et al. (1977) and Werther (1975) correlations. The bubble size distribution predicted from simulations is broader compared to experiments. Both the bubble rise velocity and the bubble size increase with increase in excess gas velocity. The experimental measurements and simulation predictions are in fair agreement with the Hilligardt and Werther (1986) correlation.

LanguageEnglish
Title of host publicationCFB-11: Proceedings of the 11th International Conference on Fluidized Bed Technology
PublisherChemical Industry Press
Number of pages6
StatePublished - 2014
Event11th International Conference on Fluidized Bed Technology, CFB 2014 - Beijing, China
Duration: 14 May 201417 May 2014

Conference

Conference11th International Conference on Fluidized Bed Technology, CFB 2014
CountryChina
CityBeijing
Period14/05/1417/05/14

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Fluidized beds
Tomography
Gases
X rays
Kinetic theory
Aluminum Oxide
Fluidization
Oxides
Electron beams
Alumina
Experiments
Fluids

Cite this

Verma, V., Padding, J. T., Deen, N. G., Kuipers, J. A. M., Bieberle, M., Barthel, F., ... Hampel, U. (2014). Bubble characterstics in a 3-D gas-solid fluidized bed: predictions from ultra-fast x-ray tomography and twofluid model. In CFB-11: Proceedings of the 11th International Conference on Fluidized Bed Technology Chemical Industry Press.
Verma, V. ; Padding, J.T. ; Deen, N.G. ; Kuipers, J.A.M. ; Bieberle, M. ; Barthel, F. ; Wagner, M. ; Hampel, U./ Bubble characterstics in a 3-D gas-solid fluidized bed : predictions from ultra-fast x-ray tomography and twofluid model. CFB-11: Proceedings of the 11th International Conference on Fluidized Bed Technology. Chemical Industry Press, 2014.
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Verma, V, Padding, JT, Deen, NG, Kuipers, JAM, Bieberle, M, Barthel, F, Wagner, M & Hampel, U 2014, Bubble characterstics in a 3-D gas-solid fluidized bed: predictions from ultra-fast x-ray tomography and twofluid model. in CFB-11: Proceedings of the 11th International Conference on Fluidized Bed Technology. Chemical Industry Press, 11th International Conference on Fluidized Bed Technology, CFB 2014, Beijing, China, 14/05/14.

Bubble characterstics in a 3-D gas-solid fluidized bed : predictions from ultra-fast x-ray tomography and twofluid model. / Verma, V.; Padding, J.T.; Deen, N.G.; Kuipers, J.A.M.; Bieberle, M.; Barthel, F.; Wagner, M.; Hampel, U.

CFB-11: Proceedings of the 11th International Conference on Fluidized Bed Technology. Chemical Industry Press, 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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N2 - The bubble characteristics in a 3-D cylindrical fluidized bed have been investigated both experimentally and numerically. Experiments were performed on a 0.1 m diameter fluidized bed, with alumina oxide particles (diameter ~1 mm) as a fluidizing material. Measurements were done at a spatial resolution of 1 mm and a temporal resolution of 1000 cross-sectional images per second, using an ultrafast electron beam X-ray computed tomography (XRT) setup (Fischer and Hampel 2010). A two-fluid model using kinetic theory of granular flow (Verma et al., 2013) was used to predict the bed dynamics numerically. The equivalent bubble diameter as a function of height is in close agreement with Darton et al. (1977) and Werther (1975) correlations. The bubble size distribution predicted from simulations is broader compared to experiments. Both the bubble rise velocity and the bubble size increase with increase in excess gas velocity. The experimental measurements and simulation predictions are in fair agreement with the Hilligardt and Werther (1986) correlation.

AB - The bubble characteristics in a 3-D cylindrical fluidized bed have been investigated both experimentally and numerically. Experiments were performed on a 0.1 m diameter fluidized bed, with alumina oxide particles (diameter ~1 mm) as a fluidizing material. Measurements were done at a spatial resolution of 1 mm and a temporal resolution of 1000 cross-sectional images per second, using an ultrafast electron beam X-ray computed tomography (XRT) setup (Fischer and Hampel 2010). A two-fluid model using kinetic theory of granular flow (Verma et al., 2013) was used to predict the bed dynamics numerically. The equivalent bubble diameter as a function of height is in close agreement with Darton et al. (1977) and Werther (1975) correlations. The bubble size distribution predicted from simulations is broader compared to experiments. Both the bubble rise velocity and the bubble size increase with increase in excess gas velocity. The experimental measurements and simulation predictions are in fair agreement with the Hilligardt and Werther (1986) correlation.

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Verma V, Padding JT, Deen NG, Kuipers JAM, Bieberle M, Barthel F et al. Bubble characterstics in a 3-D gas-solid fluidized bed: predictions from ultra-fast x-ray tomography and twofluid model. In CFB-11: Proceedings of the 11th International Conference on Fluidized Bed Technology. Chemical Industry Press. 2014.