Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Numerical Simulation of Fluid Dynamics and Mixing in Headers of Sodium-Air Heat Exchangers

12/16/2023 2023 - #04 Thermal physics and thermal hydraulics

Smetanin T.R. Pakholkov V.V. Rogozhkin S.A. Shepelev S.F.

DOI: https://doi.org/10.26583/npe.2023.4.04

UDC: 621.039.5:532

The paper presents the results of a numerical simulation for sodium fluid dynamics and mixing in the tubing system of an air-cooled heat exchanger (AHX), which is a part of the emergency cooldown system (ECS) of sodium fast reactors (SFRs). Non-uniform sodium flows in the AHX tubing system may lead to the mixing of different-temperature sodium flows, temperature fluctuations and tube breaks. It was found in the course of investigating accidents involving breaks in the PFR and Phenix reactor AHX tubing systems that the failure was caused by the metal temperature fluctuations [1].

The numerical simulation used three- and one-dimensional computer codes. It has been found that the calculations of the AHX sodium flow rate distribution with a practically acceptable accuracy can be performed using a one-dimensional code. The factors that influence the non-uniform distribution of sodium flows in the AHX tubing system have been analyzed. Calculations have been performed for the AHX sodium flow distributions and for the mixing of different-temperature sodium flows in the AHX outlet header. The results are presented from calculating the amplitude of sodium fluctuations near the AHX header walls. The effect from shutting down several modules on the non-uniform flow distribution and temperature fluctuations in the AHX has been investigated. Approximations of numerical solutions have been obtained for the sodium flow distribution as a function of the number of the modules shut down.

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BN reactors AHX sodium mixingCFD hydrodynamics unevenness leaks pulsations

Link for citing the article: Smetanin T.R., Pakholkov V.V., Rogozhkin S.A., Shepelev S.F. Numerical Simulation of Fluid Dynamics and Mixing in Headers of Sodium-Air Heat Exchangers. Izvestiya vuzov. Yadernaya Energetika. 2023, no. 4, pp. 49-60; DOI: https://doi.org/10.26583/npe.2023.4.04 (in Russian).

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