Authors & Affiliations

Belyaev I.A.1,2, Razuvanov N.G.1, Krasnov D.S.3, Sviridov V.G.1,2
1 Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow, Russia
2 National Research University "Moscow Power Engineering Institute", Moscow, Russia
3 Technical University Ilmenau, Ilmenau, Germany

Belyaev I.A. – Head of laboratory, Cand. Sci. (Techn.), Joint Institute for High Temperatures of the Russian Academy of Sciences, National Research University "Moscow Power Engineering Institute". Contacts: 13/2, Izhorskaya st., Moscow, Russia, 125412. Tel: +7(495) 484-25-92; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Razuvanov N.G. – Leading Researcher, Dr. Sci. (Techn.), Joint Institute for High Temperatures of Russian Academy of Science.
Krasnov D.S. – Senior Researcher, Cand. Sci. (Phys.-Math.), Technical University Ilmenau.
Sviridov V.G. – Head of Department, Dr. Sci. (Techn.), Professor, Joint Institute for High Temperatures of the Russian Academy of Sciences, National Research University "Moscow Power Engineering Institute".

Abstract

The article presents data summarizing experimental studies of the liquid metal downflow in a duct under the influence of a transverse magnetic field applied along the long side of the duct. The configuration under consideration is close to the conditions of the blanket module of a tokamak-type thermonuclear reactor. Mercury is used as a model liquid metal. Experiments are conducted using immersion probe with microthermcouple moving inside the duct at certain cross section, which then point by point restores profiles of averaged and fluctuating temperature.
The combined effect of electromagnetic forces and buoyancy forces leads to the formation of secondary vortices in the flow with respect to the main flow, which cause fluctuation of temperature with high amplitude and low. The paper analyzes the temperature signals accompanying the pulsating flow of liquid metal under the influence of a strong transverse magnetic field and a significant thermal load. Different configurations of the applied thermal load, namely symmetric and asymmetric heating, generate different in structure and statistical characteristics, but common in its nature phenomena. During symmetric heat load quasiharmomic temperature fluctuations have been observed. During asymmetric heat load periodic peaks of temperature have been observed. For formal distinction of types of the observed flows it is offered to use coefficient of harmonic distortions.
In this paper, we have experimentally studied the temperature signals formed in strong magnetic field, analyzed their statistical characteristics, measured the scale of emerging structures, determined the characteristic flow regimes, and proposed terminology to describe the different types of observed temperature fluctuations.

Keywords
liquid metal, mercury, magnetohydrodynamics (MHD), heat transfer, probe measuring, mixed convection, duct flows

Article Text (PDF, in Russian)

References

UDC 621.039.6.536.24

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2018, issue 5, 5:8