Use of magnetic force to control convection

Nobuko I. Wakayama; Jianwei Qi; Akira Yabe

doi:10.1117/12.351299

6 July 1999 Use of magnetic force to control convection

Nobuko I. Wakayama, Jianwei Qi, Akira Yabe

Proceedings Volume 3792, Materials Research in Low Gravity II; (1999) https://doi.org/10.1117/12.351299
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Because magnetization force is body force, it is possible to induce convection and buoyancy driven flows. A vertical magnetization force can modify the vertical acceleration and quench natural convection. The effect of horizontal and vertical magnetization forces on natural convection is studied. We present numerical simulations of the velocity and temperature distributions of a nonconducting fluid heated from below in the presence of an imposed, nonuniform magnetic field, generated with a solenoid-type magnet. The vertically placed magnet induces horizontal and vertical magnetic forces due to the gradient of magnetic strength, and the horizontal force is found to play an important to damp natural convection. When an imposed magnetic field of strength H₀ in the middle of the magnet, is less than a critical value, H_0c, the damping effect increases with increasing H₀. For H₀ > H_0c, natural convection is completely replaced by convection induced by the magnetic field. These results were discussed, comparing either the effect of vertical forces. Our results indicate a novel method to control convection of nonconducting fluids, especially in crystal formation processes.

Citation Download Citation

Nobuko I. Wakayama, Jianwei Qi, and Akira Yabe "Use of magnetic force to control convection", Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); https://doi.org/10.1117/12.351299

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