Abstract
In this work, we perform a series of experiments to study a buoyant miscible jet flow wherein a heavy fluid is injected vertically downward into a more viscous light ambient fluid. The injection flow occurs in a large rectangular tank, representing an unbounded environment. Using non-intrusive experimental methods, including high-speed camera imaging, Ultrasound Doppler Velocimetry (UDV) and Planar Laser Induced Fluorescence (PLIF), we analyze the flow characteristics versus the governing dimensionless numbers of the flow, including the Reynolds number (Re) and the viscosity ratio (m), at a constant Archimedes number (Ar). We mainly focus on the effects of \(m\gtrsim 1\) on different flow behaviours of our buoyant jets. We identify three distinct flow regimes, i.e. a jellyfish regime, a funnel regime and a cone regime, and quantify their transition boundaries versus the flow dimensionless numbers. Our results show that increasing m can enhance the jet instability in the jellyfish regime; however, in the funnel regime, increasing m stabilizes the jet. Furthermore, m does not seem to significantly affect the jet characteristics at large Re.
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Acknowledgements
This research has been carried out at Université Laval. The authors wish to acknowledge the financial support of this research by PTAC-AUPRF via Grant No. PTAC-17-WARI-02 and NSERC via CRDPJ Grant No. 516022-17 (“Plug and Abandon Strategies for Canada’s Oil & Gas Wells”). The authors also express their gratitude to the Natural Sciences and Engineering Research Council of Canada, the Canada Research Chair on Modeling Complex Flows, and the Canada Foundation for Innovation (the John R. Evans Leaders Fund).
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Hassanzadeh, H., Eslami, A. & Taghavi, S.M. On the role of the viscosity ratio on buoyant miscible jet flows. Environ Fluid Mech 22, 337–365 (2022). https://doi.org/10.1007/s10652-021-09817-2
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DOI: https://doi.org/10.1007/s10652-021-09817-2