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A schematic of a classic closed-loop magnetically controlled convective heat transfer system illustrating the thermo-magnetic siphoning effect.
A magnetically controlled convective heat transfer system positioned inside a surrounding air domain. A concentrated heat source is positioned on the lower left side of the system near the vertical symmetry boundary of the structure. One PM design domain is shown thermally coupled to the closed-loop magnetic fluid container via an upper metallic layer. A convection boundary condition is assumed on the bottom of the lower metallic layer of the system.
(a) Optimal PM design layout (dark regions = PM; light regions = air) with three zoomed views including red arrows that indicate the PM magnetization direction. Note: magnetic vector potential field lines shown with normalized magnetic fluid body force contours (red contours = larger body force). (b) System temperature contours with fluid velocity streamlines. Note: black supplemental arrows external to the system indicate the overall magnetic fluid recirculation direction.
Comparison of temperature distribution along cut line “a”-“b” (refer to Fig. 2) for the magnetically controlled convective heat transfer system versus three other systems. Dataset A (circle data markers) represents the optimized system with Al metallic layers. Dataset B (triangle data markers) represents the optimized system with Cu metallic layers. Dataset C (plus data markers) represents a system with a manually configured eight segment Halbach array PM based on the original optimized design. Dataset D (cross data markers) represents a system consisting only of a heat source thermally coupled to an equivalent thickness lower metallic layer made of Cu material.
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