Two-Bubble Class Approach Based on Measured Bubble Size Distribution for Bubble Columns with and without Internals
| Autor: | Uwe Hampel, Craig Lavetty, Ragna Kipping, Markus Schubert, Felix Möller |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Bubble Flow (psychology) Gas holdup 02 engineering and technology General Chemistry Mechanics Flow pattern 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Square (algebra) Physics::Fluid Dynamics Distribution (mathematics) 020401 chemical engineering Homogeneous 0204 chemical engineering Tube (container) 0210 nano-technology |
| Zdroj: | Industrial & Engineering Chemistry Research. 58:2759-2769 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.8b05784 |
| Popis: | 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,... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|