Investigation of the hydrodynamics of a submerged jet of liquid metal complicated by the influence of a longitudinal magnetic field

Аuthors

Sokolov M. A., Razuvanov N. G.

Joint Institute for High Temperatures of the Russian Academy of Sciences, 13, Izhorskaya str., Moscow, 125412, Russia

Abstract

The hydrodynamics of a submerged liquid metal jet with an upward flow in a longitudinal magnetic field (LMF) have been studied. Such a flow is realized with a sudden expansion of the flow from a small-diameter pipe opening (5 mm) into a larger-diameter pipe (25 mm). The experiments were conducted using a mercury magnetohydrodynamic stand located at the National Research University MPEI. A longitudinal thermocouple probe with two microthermocouples at the end was used to perform two-dimensional measurements of local characteristics of the temperature field and velocity in the LM flow. Velocity profiles are measured by a correlation method using the natural background of turbulent temperature fluctuations carried by the flow. The microthermopone probe made it possible to obtain velocity fields in flow modes with Reynolds numbers determined by the diameter of 18 mm, in the range of Re from 4300 to 7800 at magnetic induction values of the magnetic field in the range from 0 to 0,96 T, which corresponds to the Hartmann numbers Ha = 0–450. In a longitudinal magnetic field, the jet expands along the length and the velocity decreases. In addition, in the PMF, the jet is more stable: the expansion of the jet is drawn in along the length of the channel. The results obtained characterize the effect of suppressing low-frequency pulsations in the presence of a magnetic field. It was determined that the pulsation amplitude in the presence of the PMF can both exceed and be lower than the pulsation amplitude of the mode without the PMF. This difference in amplitudes depends on the distance from the jet edge. Additionally, numerical studies were carried out. Numerical modeling was carried out using the RANS (Reynolds – Averaged Navier – Stokes) model of the ANES code. The closure model used in the work was a two-parameter k-ω model. The calculation and experimental results are compared in the range of operating parameters for Reynolds numbers Re = 4300–7800, Hartmann numbers Ha = 0–450. The calculation results are in satisfactory agreement with the experimental data. The results of experiments and numerical modeling are qualitatively comparable with the data of other authors.

Keywords:

submerged jet, longitudinal magnetic field, liquid metal, correlation method, two-thermo-couple probe, ANES

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