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Large-eddy simulation of magnetohydrodynamics and heat transfer in annular pipe liquid metal flow

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posted on 2023-05-17, 16:09 authored by Francesco FicoFrancesco Fico, Ivan Langella, Hao XiaHao Xia

Turbulent structures in a concentric annular pipe within a uniform transverse magnetic field are examined for a liquid metal flow. Large-eddy simulations are performed to study the effect of magnetic field on turbulence suppression and heat transfer within this geometry. At the characteristic Prandtl number of liquid metals, the smallest scales based on temperature fluctuations are much larger than those of the velocity, which allows to resolve all the temperature scales with sufficient accuracy. The calculations are run at Reynolds number 8900 for three different Hartmann numbers, Ha = 40, 60, 120. The comparison with available direct numerical simulation data shows encouraging agreement. The main findings of this work show a circumferential dependency of the flow characteristics on the local orientation of the magnetic field, with increased anisotropy observed at all Hartmann numbers studied. Anisotropic effects of the magnetic field are predominant for Ha = 60 and Ha = 120 causing turbulence to deviate from its conventional state. At these Hartmann numbers, a partial redistribution of the turbulent kinetic energy from the axial and radial components to the azimuthal component is observed. This effect, observed here for the first time, appears to be related to the appearance of coexisting quasi-2D and 3D turbulence states. Moreover, large skin friction increments are also observed at Ha = 60 and Ha = 120, while coherent structures stretching and streak suppression are found for all three Hartmann numbers.

Funding

DTP 2018-19 Loughborough University

Engineering and Physical Sciences Research Council

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UK Atomic Energy Authority (UKAEA)

UK Turbulence Consortium

Engineering and Physical Sciences Research Council

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History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Physics of Fluids

Volume

35

Issue

5

Publisher

AIP Publishing

Version

  • VoR (Version of Record)

Rights holder

© Authors

Publisher statement

This is an Open Access Article. It is published by AIP Publishing under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2023-04-09

Publication date

2023-05-01

Copyright date

2023

ISSN

1070-6631

eISSN

1089-7666

Language

  • en

Depositor

Dr Hao Xia. Deposit date: 25 April 2023

Article number

055106

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