Liquid metal flow in immersed jet form takes place in the loops of nuclear and thermonuclear reactors in sections with an abruptly increased channel cross section, or when cocurrent coolants are mixed with each other. As far as flows of nonmetal fluids are concerned, a lot of scientific and experimental data on them have been obtained. Liquid metals are new promising coolants, and their hydrodynamic characteristics have been studied to an insufficient extent, especially under the conditions of strong magnetic fields. The aim of the work is to study immersed jet flow of mercury in longitudinal magnetic field (LMF). In the experiment, a jet is produced as it flows out from a small-diameter (5 mm) tube into a tube of a larger diameter (25 mm). The experimental data for the fields of velocity longitudinal component and also for temperature spectral characteristics were obtained using a correlation sensor on the mercury magnetohydrodynamic test bench at the NRU MPEI Department of Engineering Thermal Physics. Apart from the experimental investigation, a numerical calculation was carried out according to the RANS method in the ranges of Reynolds numbers Re = 9700‒36 000 and Hartman numbers Ha = 0‒125. The modeling was carried out using the ANES computer code. The possibility to measure the local velocity of a jet immersed in a flow by means of a probe composed of thermocouples using the correlation method is revealed. The jet longitudinal averaged velocity profiles were measured, and the jet length after its outflow from the nozzle was determined. The influence of longitudinal magnetic field has been revealed: with a growth in the Hartman number, the jet width and the absolute temperature pulsation level decreased, and the jet length increased as a consequence of suppressing the velocity transverse component.
Sokolov et al. (Wed,) studied this question.