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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EXPERIMENTAL INVESTIGATION OF A LIQUID METAL MIXED CONVECTION AFFECTED BY TRANSVERSE MAGNETIC FIELD

Get access (open in a dialog) DOI: 10.1615/IHTC16.cov.022920
pages 3313-3318

Sinopsis

Experimental investigations of hydrodynamics and heat transfer of liquid metal flow affected by magnetic field are performed for many years by MPEI-JIHT research group. MHD-configurations close to TOKAMAK reactor conditions are studied using mercury as a model liquid. Gathered data include averaged over time temperature fields, local wall temperature distributions and statistical characteristics of temperature fluctuations in a flow. Obtaining of such detailed data has become possible due to unique micro thermocouple invasive probes technique. Deep analysis of experimental data showed that combined exposure of a strong magnetic field and buoyancy forces manifests itself in previously unknown forms. The most interesting phenomena, which observed in experiments, are listed below: MHD modes with "degraded" heat transfer, the extremely non-uniform distribution of heat transfer coefficients on the channel perimeter, abnormally high temperature fluctuations, abnormally low frequent temperature fluctuations. A specific of the area and adjacent regions have been explored for round vertical tubes with down flow and uniform heating (Grashof number up to 1.2·108) as a basic configuration with clear boundary conditions. The goal of the work is to obtain and to extract suitable data for numerical simulation, especially fields of temperature fluctuations intensity. Compilation of available experimental results allow us to develop simple models of turbulence transport in magnetic field. Such models are being developed for basic channels such as pipe and rectangular channel.