Fast X-ray tomography for the quantification of the bubbling-, turbulent- and fast fluidization-flow regimes and void structures

Saayman, Jean; Nicol, Willie; Ommen, J. Ruud van; Mudde, Robert F.

doi:10.1016/j.cej.2013.09.008

Cited by 40 publications

(30 citation statements)

References 21 publications

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“…The authors performed a wide band energy analysis of fluidized bed pressure fluctuation signals using a new frequency division method. Recent methods on flow regime identification in gas-solid fluidized beds have been published by Tamadondar et al (2012), Saayman et al (2013), Jaiboon et al (2013), Llop et al (2015) and Zhu et al (2013). The first research team used particle trajectories to determine the boundaries of the fluidization regimes.…”

Section: Introductionmentioning

confidence: 99%

New methods for flow regime identification in bubble columns and fluidized beds

Nedeltchev

2015

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 99%

New methods for flow regime identification in bubble columns and fluidized beds

Nedeltchev

2015

Chemical Engineering Science

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“…Details on this setup, the measurement techniques and results are previously published [32,33]. The reaction setup was a 140 mm (ID) acrylic column with a height of 5.5 m, which was used to conduct reaction performance experiments.…”

Section: Methodsmentioning

confidence: 99%

“…Detailed results of the XRT-obtained hydrodynamic insights are reported in previously published work and will be incorporated in this work [32,33]. All reaction experiments are conducted in a 14 cm column using the ozone decomposition reaction and spanning the bubbling to turbulent onset regimes (0.09 < U 0 /U c < 1.11).…”

Section: Introductionmentioning

confidence: 99%

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Interphase mass transfer of the high velocity bubbling fluidization regime

Saayman

Nicol

2015

Chemical Engineering Research and Design

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Gas-solid fluidization experiments were performed in two separate experimental setups with similar dimensions. Fast X-Ray Tomography (XRT) was used in setup 1, while ozone decomposition experiments were performed in setup 2. Packing and operation characteristics for the two setups were close to identical. The hydrodynamic measurements from the XRT acquisitions were used to evaluate the interphase mass transfer characteristics obtained from the ozone decomposition results. Superficial velocities (U 0 ) spanning the bubbling up to the onset of the turbulent regime (U c ) were employed. Traditional specific interphase mass transfer (k be ) correlations are based on incipiently fluidized beds; however, results suggested that a distinction should be made between the low-interaction bubbling regime and the highinteraction bubbling regime. A change in mass transfer behaviour occurred around a U 0 /U c value of 0.25. An empirical correlation for k be of the high-interaction bubbling regime is 1

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“…A fast X-ray CT system with 60 independent switchable X-ray sources has been suggested in Hori, Fujimoto, and Kawanishi (1998) and a similar system with 18 X-ray sources having the frame rate of 250 frames/s in Kai et al (2000) and Misawa, Tiseanu, Prasser, and Ichikawa (2003). A slightly different approach enabling dual plane measurements with the speed of 100 frames/s has been introduced in Mudde (2011) andSaayman, Nicol, van Ommen, andMudde (2013). The system has been used, for example, to determine the velocities of voids in fluidized beds.…”

Section: Optical Flow Metersmentioning

confidence: 99%