Abstract
Two-phase flow instabilities and in particular density wave oscillations (DWOs) are unwanted in boiling, condensation, and other flow boiling systems as it can cause severe deterioration in the performance or even damage the system. For decades, efforts have been focused on designing equipment or processes that operate far from the conditions where the two-phase flow instabilities are present. And hence multiple studies in particular experiments were carried out to identify the characteristics of the instability thresholds during the DWOs. In this work, we show that the conventional approach of identifying the instability thresholds does not hold good to determine the global stability behavior of the system. This includes identifications of the limit cycle oscillations and the Hopf bifurcation across the instability thresholds. And hence, this study postulates the need for redefining the criteria and the approach to identify the instability thresholds experimentally.
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Acknowledgements
Funding for this work from the Research Council of Norway under the FRINATEK project 275652 is gratefully acknowledged. The authors also gratefully acknowledge the European Unions Horizon 2020 research and innovation programme to receive funding from the Marie Skodowska-Curie Actions Individual Fellowship grant (Dr. Subhanker Paul) for the project HisTORIC (No 789476).
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Paul, S., Paul, S., Fernandino, M., Dorao, C.A. (2021). Does the Criteria of Instability Thresholds During Density Wave Oscillations Need to Be Redefined?. In: Bose, M., Modi, A. (eds) Proceedings of the 7th International Conference on Advances in Energy Research. Springer Proceedings in Energy. Springer, Singapore. https://doi.org/10.1007/978-981-15-5955-6_5
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DOI: https://doi.org/10.1007/978-981-15-5955-6_5
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