Voronoï analysis of bubbly flows via ultrafast X-ray tomographic imaging

Lau, Y.M.; Müller, Karolin; Azizi, Salar; Schubert, Markus

doi:10.1007/s00348-016-2118-8

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…The resulting data matrix for each plane is binarized using a global threshold value (0.65). , The matrix has a stack size of 208 × 208 pixels (excluding the pixels outside the CSA and covered by the internal tubes) × 10 000 frames (according to the measurement time of 10 s at a frame rate of 1000 frames s –1 ). It has already been confirmed that a measurement time of 10 s is sufficient to determine reliable bubble size distributions. , Eventually, algorithms for the extraction of characteristic hydrodynamic data, such as gas holdup, bubble velocities, gas velocity, and BSD, are applied as explained below.…”

Section: Post-processingmentioning

confidence: 99%

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Two-Bubble Class Approach Based on Measured Bubble Size Distribution for Bubble Columns with and without Internals

Möller

Kipping

Lavetty

et al. 2019

Ind. Eng. Chem. Res.

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The complex flow patterns in bubble columns can be phenomenologically described by the two-bubble class approach. For the first time, this approach is applied to bubble columns with dense internals. Internals of square and triangular pitch tube patterns of two tube sizes (8 × 10–3 and 13 × 10–3 m) with flat and U-tube bottom design and cross-sectional occupation of ∼25% were inserted in a bubble column of 0.1 m diameter and 2 m height. Contrary to the well-known gas disengagement technique, dual-plane ultrafast X-ray computed tomography data have been used for the bubble class allocation. Experiments were performed at superficial gas velocities ranging from 0.02 to 0.20 m s–1 to cover homogeneous and heterogeneous flow conditions. The contributions of small and large bubble classes on total gas holdup, flow structure and bubble rise velocities were determined. Furthermore, the regime transition onset was determined based on the two-bubble class approach. Eventually, new correlations for regime transition, small and large bubble rise velocities, and large bubble holdup as well as total gas holdup are proposed based on sub-channel area, sub-channel hydraulic diameter, and occlusion area.

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