LAPSE:2023.35096
Published Article
LAPSE:2023.35096
Transferring Bubble Breakage Models Tailored for Euler-Euler Approaches to Euler-Lagrange Simulations
Yannic Mast, Ralf Takors
April 28, 2023
Most bubble breakage models have been developed for multiphase simulations using Euler-Euler (EE) approaches. Commonly, they are linked with population balance models (PBM) and are validated by making use of Reynolds-averaged Navier-Stokes (RANS) turbulence models. The latter, however, may be replaced by alternate approaches such as Large Eddy simulations (LES) that play a pivotal role in current developments based on lattice Boltzmann (LBM) technologies. Consequently, this study investigates the possibility of transferring promising bubble breakage models from the EE framework into Euler-Lagrange (EL) settings aiming to perform LES. Using our own model, it was possible to reproduce similar bubble size distributions (BSDs) for EL and EE simulations. Therefore, the critical Weber (Wecrit) number served as a threshold value for the occurrence of bubble breakage events. Wecrit depended on the bubble daughter size distribution (DSD) and a set minimum time between two consecutive bubble breakage events. The commercial frameworks Ansys Fluent and M-Star were applied for EE and EL simulations, respectively. The latter enabled the implementation of LES, i.e., the use of a turbulence model with non-time averaged entities. By properly choosing Wecrit, it was possible to successfully transfer two commonly applied bubble breakage models from EE to EL. Based on the mechanism of bubble breakage, Wecrit values of 7 and 11 were determined, respectively. Optimum Wecrit were identified as fitting the shape of DSDs, as this turned out to be a key criterion for reaching optimum prediction quality. Optimum Wecrit values hold true for commonly applied operational conditions in aerated bioreactors, considering water as the matrix.
Keywords
bubble breakup, bubble size distribution (BSD), computational fluid dynamics (CFD), daughter size distribution (DSD), euler-lagrange approach (EL), large eddy simulation (LES), lattice boltzmann simulation (LBM), multiphase reactors, Sauter diameter, turbulence/bubble interaction
Suggested Citation
Mast Y, Takors R. Transferring Bubble Breakage Models Tailored for Euler-Euler Approaches to Euler-Lagrange Simulations. (2023). LAPSE:2023.35096
Author Affiliations
Mast Y: Institute of Biochemical Engineering, University of Stuttgart, 70569 Stuttgart, Germany
Takors R: Institute of Biochemical Engineering, University of Stuttgart, 70569 Stuttgart, Germany [ORCID]
Journal Name
Processes
Volume
11
Issue
4
First Page
1018
Year
2023
Publication Date
2023-03-27
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr11041018, Publication Type: Journal Article
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LAPSE:2023.35096
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doi:10.3390/pr11041018
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Apr 28, 2023
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