Contact
Dr. Markus Schubert
m.schubert
hzdr.de
Phone: +49 351 260 2627
Dr. Frank Barthel
Fast X-ray Imaging
Experimental technology
f.barthelhzdr.de
Phone: +49 351 260 2348
+49 351 260 3704
XFLOW: Ultrafast X-ray tomography of turbulent bubble flows
The understanding of disperse gas-liquid flows in bubble columns or above column trays is still fragmentary. In particular, the bubble swarm behavior, the evolving flow pattern and coherent structures as well as the degree of turbulence are until now hardly quantified – certainly not at relevant operating conditions such as elevated pressure and organic liquids.
Aim of the project is to elucidate the complex flow phenomena in bubble columns applying the ultrafast X-ray computed tomography. Initially, air-water systems will be studied; later systems at elevated pressure and with organic liquids will be in the focus of the investigations.
Considerable process parameters and numbers for the description of hydrodynamic and mass transfer and for design of bubble columns can be extracted from tomographic measurement data. Moreover, statistical approaches such as wavelet analysis and non-linear chaos analyses will be applied to derive hidden information about the hydrodynamics and regime transitions from high-frequent measurement data.
In addition, tomographic imaging provide information about coalescence and breakup rates in bubble swarms and allows the development of respective models beyond the homogeneous flow regime. Eventually, the experimental results will be incorporated in models for numerical flow simulations.
Funding
- Funding organization: European Research Council
- Title: 7th Framework Programme, Starting Grants
- Funding reference number: 307360
- Period: 01/13 - 12/16
Literature
Peer-reviewed papers
S. Nedeltchev; Th. Donath; S. Rabha; U. Hampel; M. Schubert
New Evidence for the Mixing Length Concept in a Narrow Bubble Column Operated in the Transition Regime
Journal of Chemical Engineering of Japan 47, 722-729 (2014)S. Nedeltchev; M. Schubert
Statistical Validation of the Mixing Length Concept in Bubble Columns Operated in the Transition Flow Regime
Journal of Chemical Engineering of Japan 48, 107-111 (2015).S. Nedeltchev; U. Hampel; M. Schubert
Experimental Study On the Radial Distribution of the Main Transition Velocities in Bubble Columns
WIT Transactions on Engineering Sciences 89, 127-138 (2015), ISBN: 978-1-84564-946-3
Oral Presentations at Conferences
S. Azizi; M. Schubert
Numerical Modeling of Bubble Columns Using Experimental Breakup and Coalescence Rates of Bubbles
DECHEMA Annual Meeting of the Specialized Groups on Computational Fluid Dynamics, Mixing Processes and Rheology, Würzburg (Germany), February 24-25 (2014).S. Nedeltchev; M. Schubert; Th. Donath; S. Rabha; U. Hampel
Relationship Between Kolmogorov Entropy and Characteristic Mixing Length in Narrow Bubble Columns Operated in the Transition Flow Regime
DECHEMA Annual Meeting of the Specialized Groups on Multiphase Flows and Heat- and Mass Transfer, Fulda (Germany), March 24-25 (2014).S. Azizi; Y. M. Lau; M. Schubert
Analysis of Breakup & Coalescence Rates inside the Bubble Columns
21st International Congress of Chemical and Process Engineering (CHISA-21), Prague (Czech Republic), August 23-27 (2014).S. Nedeltchev; M. Schubert; Th. Donath; S. Rabha; U. Hampel
Identification of the Main Flow Regime Boundaries in Two Bubble Columns Based On a New Parameter Extracted from Gas Holdup Fluctuations
2nd International Symposium on Multiscale Multiphase Process Engineering (MMPE-2), Hamburg (Germany), September 24-27 (2014).Y. M. Lau; M. Schubert
Bubble Size and Velocity Measurements in Bubble Columns using Ultrafast X-ray Tomography
AIChE Annual Meeting, Atlanta (USA), November 16-21 (2014).S. Nedeltchev; U. Hampel; M. Schubert
Experimental study on the radial distribution of the main transition velocities in bubble columns
Eight International Conference On Computational and Experimental Methods in Multiphase and Complex Flow (Multiphase Flow 2015), Valencia (Spain), April 20-22 (2015).N. Šimić; K. Breiler; M. Schubert
Hydrodynamic and Mass Transfer Properties of a Bubble Column with Vertically Inserted Tube Bundles
12th International Conference On Gas-Liquid and Gas-Liquid-Solid Reactor Engineering (GLS12), New York (USA), June 28-July 1 (2015).Y. M. Lau; K. Müller; M. Schubert
Analyzing clustering in bubbly flow using ultra-fast X-ray tomography
12th International Conference On Gas-Liquid and Gas-Liquid-Solid Reactor Engineering (GLS12), New York (USA), June 28-July 1 (2015).S. Nedeltchev; M. Schubert
New Approaches for Prediction of Gas Holdups and Validation of the Mixing Length Concept in Gas-Liquid and Slurry Bubble Columns
12th International Conference On Gas-Liquid and Gas-Liquid-Solid Reactor Engineering (GLS12), New York (USA), June 28-July 1 (2015).
Poster Presentations at Conferences
S. Nedeltchev; U. Hampel; M. Schubert
Comparison of New Entropy Profiles in Bubble Columns Operated with Air-Water and Air-Therminol Systems
Annual Meeting of the Professional Groups On Computational Fluid Dynamics and Multiphase Flows, Lüneburg (Germany), March 19-20 (2015).S. Azizi; Y. M. Lau; M. Schubert
The Breakup and Coalescence of Bubbles Considering Interphase Turbulence Transfer in Bubbly Flows
12th International Conference On Gas-Liquid and Gas-Liquid-Solid Reactor Engineering (GLS12), New York (USA), June 28-July 1 (2015).
Further links
