Transition from wall modes to multimodality in liquid gallium magnetoconvection

Xu, Yufan; Horn, Susanne; Aurnou, Jonathan M.

doi:10.1103/physrevfluids.8.103503

Transition from wall modes to multimodality in liquid gallium magnetoconvection

Journal Article · Fri Oct 27 00:00:00 EDT 2023 · Physical Review Fluids (Online)

DOI:https://doi.org/10.1103/physrevfluids.8.103503· OSTI ID:2432514

^[1]; ^[2]; Aurnou, Jonathan M. ^[3]

Univ. of California, Los Angeles, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Coventry University (United Kingdom)
Univ. of California, Los Angeles, CA (United States)

Coupled laboratory-numerical experiments of Rayleigh-Bénard convection in liquid gallium subject to a vertical magnetic field are presented. The experiments are carried out in two cylindrical containers with diameter-to-height aspect ratio Γ = 1.0 and 2.0 at varying thermal forcing (Rayleigh numbers 10⁵ ≲ Ra ≲ 10⁸) and magnetic field strength (Chandrasekhar numbers 0 ≲ Ch ≲ 3 × 10⁵). Laboratory measurements and numerical simulations confirm that magnetoconvection in our finite cylindrical tanks onsets via nondrifting wall-attached modes, in good agreement with asymptotic predictions for a semi-infinite domain. With increasing supercriticality, the experimental and numerical thermal measurements and the numerical velocity data reveal transitions between wall mode states with different azimuthal mode numbers and between wall-dominated convection to wall and interior multimodality. These transitions are also reflected in the heat transfer data, which combined with previous studies connect onset to supercritical turbulent behaviors in liquid metal magnetoconvection over a large parameter space. The gross heat transfer behaviors between magnetoconvection and rotating convection in liquid metals are compared and discussed.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: EPSRC; National Science Foundation (NSF); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2432514

Alternate ID(s):: OSTI ID: 2203984

Journal Information:: Physical Review Fluids (Online), Journal Name: Physical Review Fluids (Online) Journal Issue: 10 Vol. 8; ISSN 2469-990X

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
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Direct numerical simulations
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Navier-Stokes equation
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Transition from wall modes to multimodality in liquid gallium magnetoconvection

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