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이차원 사각공동내 유체이동에 대한 자기장 효과

Magnetic Force Effect on Two-Dimensional Cavity Flow

HWAHAK KONGHAK, December 1986, 24(6), 443-449(7), NONE
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Abstract

사각공동내에 외부로부터 자장을 걸어주었을 때 자장이 공동내 유체이동에 미치는 영향을 수치적방법으로 조사하였다. Vorticity식과 energy식을 풀기 위해 power-law weighted upwind방법을 사용하였으며 Poisson식은 successive over relaxation법을 적용하여 계산하였다. 아래벽을 가열한 경우 자장을 보다 중력의 직각방향으로 걸어주는 것이 자연대류를 억제하는데 더 효과적이다. 자장의 세기가 강해질수록 속도의 절대치는 작아지며 온도분포는 순수한 전도만이 있는 경우와 비슷해진다. 또 자장의 세기가 0.2 tesla이상 강해지면 자연대류억제는 자장의 방향에 큰 영향을 받지 않는다.
The effect of an externally imposed magnetic field on the fluid flow in a rectangular cavity are studied numerically. The power-law weighted upwind method is used for the numerical solution of the vorticity transport equation and the energy equation. And the successive over-relaxation method is applied to solve the Poisson equation. It is found that the magnetic field perpendicular to the gravitation is more effective to delay and suppress the natural convection than the magnetic field parallel to the gravitation. The higher the imposed magnetic field is, the greater is the reduction in the absolute value of the velocity, and the less the convection plays a role in the temperature distribution. The direction of the magnetic field does not give as much effect in suppressing the natural convection as the magnetic field strength when it is stronger than 0.2 tesla.

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