Numerical computation on the control of aerial flow by the magnetizing force in gravitational and nongravitational fields

Abstract

Two-dimensional numerical computations were carried out in order to examine the effect of magnetizing force for the air in a cylindrical container with thermal and magnetic ®eld gradients. In a gravitational ®eld, the air was driven by both gravitational and magnetizing forces, and¯ow pattern and the heat transfer rate greatly depended on the axial position of the coil. Moreover, when the magnetizing and gravitational forces cancel out each other, convection became almost quiescent. On the other hand, the aerial¯ow was induced by the magnetizing force even in a nongravitational ®eld, and the air behaved like an electrically conducting¯uid.

Heat Transfer Control in Quiescent Air With Thermal Gradient by Magnetizing Force Under Both Gravitational and Nongravitational Fields

“…Tagawa et al [9] examined the transient convection and diffusion of pure oxygen gas in a vertical open pipe under a strong magnetic field, numerically and experimentally, and reported that the magnetic field gradient strongly affected the flow and diffusion characteristics of oxygen gas. The present authors [10] computed the behavior of air in a vertical cylindrical container with temperature boundary condition in a floating-zone crystal-growing system under a strong magnetic field and reported that the magnetizing force had great possibility for the convectional control of the fluid without electric conductivity. The above studies utilize the force called magnetic or magnetizing force.…”

Numerical simulation of thermomagnetic convection of air in a porous square enclosure under a magnetic quadrupole field using LTNE models

“…Tagawa's group [29][30][31] derived a model equation for magnetic convection using a method similar to the Boussinesq approximation and studied natural convection of paramagnetic, diamagnetic and electrically conducting fluids in a cubic enclosure with thermal and magnetic field gradients at different thermal boundary. Ozoe and co-workers [18,[32][33][34] studied natural convection of paramagnetic and diamagnetic fluids in a cylinder under gradient magnetic field at different thermal boundary and found that the magnetic force can be used to control heat transfer rate of paramagnetic and diamagnetic fluids.…”

Heat transfer rate characteristics of the magnetothermal Rayleigh–Benard convection of paramagnetic air

“…In contrast, control of the thermal convection of non-electro-conducting fluids such as paramagnetic and diamagnetic fluids has become possible with the recent development of a superconducting magnet with strong magnetic induction (10 T or more). For paramagnetic and diamagnetic fluids, the force called a magnetic force [5,6] or magnetizing force [7,8] generated by applying an inhomogeneous magnetic field was used. In addition, the control of ferromagnetic fluid [9,10] has also been extensively studied from the basics to the application.…”