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Electromagnetic control of Rayleigh-Benard convection

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1660
pages 759-762

Jos Verdoold
Department of Multi-Scale Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

A. B. Wibowo
Department of Multi-Scale Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

Mark J. Tummers
Section of Transport Phenomena, Department of Chemical Engineering, Faculty of Applied Sciences Delft University of Technology and J. M. Burgerscentre for Fluid Dynamics Julianalaan, 2628 BL Delft

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands

Résumé

This paper reports on an investigation of the interaction between thermal buoyancy and electro-magnetic (EM) forcing, aimed at utilising the latter to control heat transfer in natural and mixed convection. Recent numerical simulations by Kenjeres and Hanjalic [1] indicated a reorganisation of coherent flow structures in Rayleigh-Bénard (RB) convection when a local forcing is applied. The focus of the paper is on manipulating these structures by local Lorentz forces. Temperature and velocity measurements are performed with and without the presence of the EM forcing. They reveal characteristic vortices as well as a change in heat transfer in the vicinity of the local forcing.

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