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Localised turbulence states in differentially heated cubical enclosure of paramagnetic fluid in strong magnetic gradients

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.300
pages 264-267

Sasa Kenjeres
Transport Phenomena Section, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology and J.M. Burgerscentrum for Fluid Mechanics, Delft, The Netherlands

L. Pyrda
Department of Fundamental Research in Energy Engineering, Faculty of Energy and Fuels, AGH University of Science and Technology, 30 Mickiewicza Avenue, 30059 Krakow, Poland

Elzbieta Fornalik-Wajs
Department of Fundamental Research in Energy Engineering, Faculty of Energy and Fuels, AGH University of Science and Technology, 30 Mickiewicza Avenue, 30059 Krakow, Poland

J. S. Szmyd
Faculty of Energy and Fuels, AGH University of Science and Technology, 30 Mickiewicza Avenue, 30059 Krakow, Poland

Sinopsis

We performed experimental and numerical studies of combined natural and magnetic convection of a paramagnetic fluid inside a cubical enclosure heated from below and cooled from above and subjected to magnetic field gradient. Values of the magnetic field gradient are in 9≤|grad|b0|2|≤900 T2/m range for imposed magnetic field strengths in the centre of the superconducting magnet bore of 1 ≤|b0|max≤10 T, respectively. Very good agreement between experiments and simulation is obtained in predicting the integral heat transfer over entire range of working parameters (i.e. thermal Rayleigh number 1.15×105≤Ra≤8×106, Prandtl number 5≤Pr≤700 and magnetisation number 0≤γ≤58.5 range). Turbulent regimes are generated from initially stable flow and heat transfer states in the range of 70≤Pr≤500 for sufficiently strong magnetic field (|b0|max≥4 T). The first- and second-order moments are analysed for different strengths of the imposed magnetisation force.

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