Bubble characteristics in a 3-D gas-solid fluidized bed: predictions from ultra-fast X-ray tomography and two-fluid model

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

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

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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 higher 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 publicationProceedings of the 11th Circulating Fluidized Beds Conference, 14-17 May 2014, Beijing, China
Pages1-6
StatePublished - 2014

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two fluid models
beds
bubbles
tomography
predictions
gases
x rays
temporal resolution
aluminum oxides
spatial resolution
electron beams
oxides
kinetics

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Verma, V. K., Padding, J. T., Deen, N. G., Kuipers, J. A. M., Bieberle, M., Barthel, F., ... Hampel, W. (2014). Bubble characteristics in a 3-D gas-solid fluidized bed: predictions from ultra-fast X-ray tomography and two-fluid model. In Proceedings of the 11th Circulating Fluidized Beds Conference, 14-17 May 2014, Beijing, China (pp. 1-6)
Verma, V.K. ; Padding, J.T. ; Deen, N.G. ; Kuipers, J.A.M. ; Bieberle, M. ; Barthel, F. ; Wagner, M. ; Hampel, W./ Bubble characteristics in a 3-D gas-solid fluidized bed: predictions from ultra-fast X-ray tomography and two-fluid model. Proceedings of the 11th Circulating Fluidized Beds Conference, 14-17 May 2014, Beijing, China. 2014. pp. 1-6
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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 higher 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, VK, Padding, JT, Deen, NG, Kuipers, JAM, Bieberle, M, Barthel, F, Wagner, M & Hampel, W 2014, Bubble characteristics in a 3-D gas-solid fluidized bed: predictions from ultra-fast X-ray tomography and two-fluid model. in Proceedings of the 11th Circulating Fluidized Beds Conference, 14-17 May 2014, Beijing, China. pp. 1-6.

Bubble characteristics in a 3-D gas-solid fluidized bed: predictions from ultra-fast X-ray tomography and two-fluid model. / Verma, V.K.; Padding, J.T.; Deen, N.G.; Kuipers, J.A.M.; Bieberle, M.; Barthel, F.; Wagner, M.; Hampel, W.

Proceedings of the 11th Circulating Fluidized Beds Conference, 14-17 May 2014, Beijing, China. 2014. p. 1-6.

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

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AU - Padding,J.T.

AU - Deen,N.G.

AU - Kuipers,J.A.M.

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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 higher 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 higher 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 VK, Padding JT, Deen NG, Kuipers JAM, Bieberle M, Barthel F et al. Bubble characteristics in a 3-D gas-solid fluidized bed: predictions from ultra-fast X-ray tomography and two-fluid model. In Proceedings of the 11th Circulating Fluidized Beds Conference, 14-17 May 2014, Beijing, China. 2014. p. 1-6.