Abstract
The in-house developed open-source FEM-CFD software FeatFlow in the framework of the “SPP 1423 Prozess-Spray” project has been further extended with newly created modules exploiting state-of-the-art numerical techniques to provide a professional prediction tool being able to simulate the process of laminar jet breakup into single-phase or composite droplets. The two main “model” modules within the complete development are responsible for the dynamic Level Set-based interface capturing of the involved phases and for the non-Newtonian extension of the basic FeatFlow software which were successfully combined with an innovative performance improving ALE-based mesh deformation module. The developed modules have been successfully validated not only individually, but also in an interconnected fashion against experimental or computational reference data from inside as well as from outside of the SPP 1423 members. The long-term validation process involved the following test cases:
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1.
Rising of a gas bubble in a liquid environment
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Laminar jet breakup in dripping and jetting mode
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Coiling of laminar liquid jets in a gas environment
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Oscillation of a non-Newtonian drop in a gas environment
The capability of the developed software covers the operation conditions of typical encapsulation processes, which from the application point of view defined the goal of our corresponding research. The developed software has been enriched with an additional module being responsible for the operational aspects of the droplet generation process by means of a flowrate modulation of the introduced dispersed phase(s). Thanks to the corresponding modulation mechanisms being also introduced into experimental setups in the form of periodic volumetric flowrate disturbances suggests an increased reproducibility of the numerical predictions with respect to experimental observations.
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Acknowledgment
The authors like to thank the German Research Foundation (DFG) for supporting the work under the grant SPP 1423 (Tu102/32) and the group of Prof. Walzel at TU Dortmund for the experimental measurements. The simulations have been carried out on the LiDOng cluster at TU Dortmund. We would like to thank the LiDOng cluster team for their help and support.
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Mierka, O., Turek, S. (2016). Numerical Simulation of Monodispersed Droplet Generation in Nozzles. In: Fritsching, U. (eds) Process-Spray. Springer, Cham. https://doi.org/10.1007/978-3-319-32370-1_13
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DOI: https://doi.org/10.1007/978-3-319-32370-1_13
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