DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf
ISBN Print: 978-1-56700-262-1
ISSN: 2377-2816
Electromagnetic enhancement of turbulence and wallheat transfer in buoyancy-driven conductive fluids: magnetically extended LES approach
要約
In this paper we address the Large-Eddy Simulations of the turbulent natural convection of an electrically conductive fluid (water with electrolyte solution) subjected to the non-uniformly distributed electromagnetic fields along the horizontal thermally active wall. The magnetically extended SGS closure of Shimoura (1991) is used to model effects of the imposed magnetic field on the subgrid velocity fluctuations. It is demonstrated that the electromagnetic forcing of the thermal boundary layers caused significant enhancement of the wall-heat transfer (up to 200%) in turbulent regime (Ra=107, Pr=7) when a multiple-array of the permanent magnets (with |B0| = 1 T) is combined with a pair of oppositely charged electrodes supplied with a DC current (I = 10 A). In addition to its potentials in various technological applications, this localised electromagnetic forcing can be used for further fundamental studies of turbulence subjected to external non-uniform body forces.