A new algorithm for segmentation of ultrafast X-ray tomographed gas–liquid flows

Banowski, Manuel; Lucas, Dirk; Szalinski, L.

doi:10.1016/j.ijthermalsci.2014.12.015

Cited by 20 publications

(3 citation statements)

References 33 publications

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“…In order to cope with noise and artifacts, bubbles detected in less than three consecutive frames and smaller than four pixels were withdrawn from further analyses. 23,25,62 Each bubble features a cluster of n b voxels. The physical voxel volume is defined as l v 2 v b Δt, where l v = 0.5 × 10 −3 m is the voxel edge length, Δt = 1 × 10 −3 s is the time between two subsequent frames (see Figure 3), and v b is the bubble velocity.…”

Section: Bubble Size Distributionmentioning

confidence: 99%

“…For the calculation of the BSD, individual bubbles were identified from the binarized 3D data matrix and labeled (see Figure ). In order to cope with noise and artifacts, bubbles detected in less than three consecutive frames and smaller than four pixels were withdrawn from further analyses. ,, …”

Section: Post-processingmentioning

confidence: 99%

“…Further details on the postprocessing of the UFXCT data for multiphase flows can be found elsewhere. ,,− …”

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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Section: Bubble Size Distributionmentioning

confidence: 99%