Mode analysis of large-scale liquid sodium circulation in a Rayleigh-Benard turbulent convection experiment

Authors

  • Андрей Дмитриевич Мамыкин (Andrey D. Mamykim) Institute of Continuous Media Mechanic UB RAS
  • Геннадий Леонидович Лосев (Gennady L. Losev) Institute of Continuous Media Mechanic UB RAS
  • Сергей Дмитриевич Мандрыкин Institute of Continuous Media Mechanic UB RAS

DOI:

https://doi.org/10.17072/1994-3598-2020-2-65-73

Keywords:

Rayleigh-Bénard convection, turbulence, large-scale circulation

Abstract

The paper presents the results of an experimental study of a turbulent convection of liquid sodium in a vertical cylinder with aspect ratio one, heated from one end and cooled from the other. A detailed spectral analysis of temperature signals was carried out for experiments lasting from 1 to 7 hours. It is shown that in the entire range of Rayleigh numbers (0.6÷2.2)·107, the turbulent flow self-organizes into a large-scale circulation (LSC), occupying the entire cavity and having a complex spatio-temporal structure. In addition to the main mode, there are additional modes in the flow structure, such as sloshing and torsion oscillations. The developed experimental data processing algorithm made it possible to isolate these modes and conduct an independent analysis of their characteristics. Long-term measurements made it possible to detect the wandering of the plane of the main LSC mode using the developed algorithm for filtering experimental data. The wandering process is non-periodic in nature and consists in irregular rotation of the LSC plane mainly at angles of the order of 40 – 50° at time scales from units to tens of minutes, and, rarely, at angles of about 90° and even 180° at large time scales. Such rare events were recorded on wavelet diagrams in the form of bursts of spectral energy density.

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Published

2020-07-13

How to Cite

Мамыкин (Andrey D. Mamykim) А. Д., Лосев (Gennady L. Losev) Г. Л., & Мандрыкин, С. Д. (2020). Mode analysis of large-scale liquid sodium circulation in a Rayleigh-Benard turbulent convection experiment. Bulletin of Perm University. Physics, (2). https://doi.org/10.17072/1994-3598-2020-2-65-73

Issue

Section

Regular articles