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ISSN Online: 2377-424X
International Heat Transfer Conference 12
Experimental and numerical investigation of thermomagnetic convection in electrononconducting fluids
Abstrakt
We present here an experimental and numerical study of the combined magnetic and natural convection in air for the case of a vertical cylindrical cavity with a central heat source. A superconducting coil produces along its axis of symmetry a vertical magnetization force, acting either in the direction of gravity in the upper half of the cavity, or opposing gravity in the lower half of the cavity. The magnetization force is proportional to the fluid magnetic susceptibility and the gradient of the square of magnetic induction. In the presence of a temperature gradient, a magnetic convection develops due to the temperature variation of the air magnetic susceptibility. Thermal measurements were made to monitor the heat transfer inside the cavity. In the case where the heat
source is placed in the magnet upper region, the temperature at the vicinity of the heat source decreases with
increasing magnetic field. Indeed, in this configuration the magnetic convection effects are added to the gravity convection effects. On the other hand, when the heat source is placed in the magnet bottom region, we observe with increasing magnetic induction, temperatures increase to the point where, gravity and magnetic forces balance, and convection along the heat source is suppressed. Increasing the magnetic induction further
leads to the a magnetic driven reverse flow, and reduced temperatures. Numerical simulation of the combined convection phenomena were performed using the commercial software
Fluent 5.3.