科研之友
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摘要
The gradient magnetic field introduced to convection heat transfer in a channel can result in longitudinal vortices in fluid flows. The laminar flow and heat transfer characteristics of air in a rectangular channel confined to magnetic bi-pole and quadrupole fields were numerically investigated. The velocity and temperature fields were obtained and the friction coefficients and Nusselt numbers were compared at different Reynolds numbers and wall temperatures for both hydraulically and thermally developing and fully developed flows. Different longitudinal vortices were presented for convection beat transfer in the magnetic bi-pole and quadrupole fields. The vortex-induced heat transfer enhancement was discussed by using the field synergy principle. ';Me results show that the synergy between the flow and temperature fields can be improved by the magnetically induced longitudinal vortices. For hydraulically and thermally developing flows, the synergy between the flow and temperature fields in the magnetic quadrupole field was superior to that in the bi-pole field. For hydraulically and thermally ftilly developed flows, however, the synergy in the magnetic quadrupole field was worse than that in the bi-pole field.
