DNS of Instantaneous Behavior in Turbulent Forced and Mixed Convection of Liquid Metal Past a Backward-Facing Step

Wang, Chaozheng; Zhao, Ping; Lei, Mingzhun; Lu, Kun; Ge, Zhihao; Liu, Jiaming; Li, Yuanjie; Pei, Gang

doi:10.1007/s10494-020-00214-1

Cited by 3 publications

(1 citation statement)

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“…Oder et al (2019) ran the first confined BFS DNS for a Pr ≪ 1 for the forced convection regime. Wang et al (2020) conducted different DNS for non-confined BFS, also for mixed-and forced convection regimes but for lead-bismuth ( Pr = O 10 −2 ). Recently, Star et al (2021) developed a reduced order model for the calculation of a non-confined BFS for liquid sodium.…”

Section: Introductionmentioning

confidence: 99%

Forced and mixed convection experiments in a confined vertical backward facing step at low-Prandtl number

et al. 2021

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In this paper, we present experimental results for a non-isothermal vertical confined backward facing step conducted with a low-Prandtl number fluid. The eutectic alloy gallium–indium–tin is used as the working fluid. We conducted experiments for different Reynolds and Richardson numbers covering both forced and mixed convection regimes. Time-averaged velocity profiles were measured at six streamwise positions along the test section center-plane with so-called permanent magnet probes. The local Nusselt number was measured in streamwise and spanwise directions along the heating plate mounted right after the step. We further ran RANS simulations of the experiment to study the qualitative influence of assuming a constant specific heat flux thermal boundary condition for the experiment heating plate. The measured velocity profiles show the expected behavior for both studied convection regimes, while the measured streamwise local Nusselt number profiles do not. This is explained by how the heating plate thermal boundary condition is defined. We performed an order of magnitude estimate to estimate the forced- to mixed convection transition onset. The estimate shows good agreement with the experimental data, although further measurements are needed to further validate the estimated transition threshold. The measurement of fluctuating quantities remains an open task to be addressed in future experiments, since the permanent magnet probe measurement equation needs further adjustments. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%