Journal
JOURNAL OF FLUID MECHANICS
Volume 953, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2022.879
Keywords
high-Hartmann-number flows; jets
Categories
Funding
- Russian Science Foundation [20-69-46067]
- Ministry of Science and Higher Education of the Russian Federation [075-01056-22-00]
- Leibniz Supercomputing Centre on the SuperMUC-NG super-computing cluster [pn68ni]
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This study experimentally investigates the dynamics of a liquid metal flow in the form of a submerged round jet entering a square duct in the presence of a transverse magnetic field. The results show that the instability of the jet leads to high-amplitude fluctuations, and the flow structure and fluctuation properties are determined by the value of the Stuart number.
A liquid metal flow in the form of a submerged round jet entering a square duct in the presence of a transverse magnetic field is studied experimentally. A range of high Reynolds and Hartmann numbers is considered. Flow velocity is measured using electric potential difference probes. A detailed study of the flow in the duct's cross-section about seven jet's diameters downstream of the inlet reveals the dynamics, which is unsteady and dominated by high-amplitude fluctuations resulting from the instability of the jet. The flow structure and fluctuation properties are largely determined by the value of the Stuart number N. At moderate N, the mean velocity profile retains a central jet with three-dimensional perturbations increasingly suppressed by the magnetic field as N grows. At higher values of N, the flow becomes quasi-two-dimensional and acquires the form of an asymmetric macrovortex, with high-amplitude velocity fluctuations reemerging.
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