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문종춘,조광현,서이수 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1
The present paper describes sloshing phenomena of the magnetic fluid flow in rectangular tank which is horizontally oscillated under non-uniform magnetic fields. In theoretical analysis, the desision of potential function obtained by assuming that linear to be non-linear boundary condition. The obtained results from experiment and theoretical analysis are as follows : The resonant frequency of fluid and magentic fluid based on a potential theory are in good agreement qualitatively with that of experimental results. It is found that resonant frequency depends on the magnetic intensity and moves into high frequency region. Pressure and velocity increase by non-linear with increasing wave heights and linearly increase with increasing magneitc force.
직사각형 용기 내에서의 유동 및 교반특성 - 중앙평판 길이의 영향 -
문종춘,서용권 대한기계학회 1994 대한기계학회논문집 Vol.18 No.10
In this paper, the fluid flow and stirring in a rectangular tank focussing on the effect of the plate length is studied numerically and experimentally. the flow model and the method of analysis are the same as those reported previously. The stirring effect changes considerably when the plate length is varied. When the plate is short, the friction at the bottom wall reduces the strength of the vortical flow resulting in a lower stirring effect. When the plate is long, the stirring effect is decreased due to the growth of the regular regions near the lower corners. The stirring effect is the best when the plate length is roughly half the width of the container.
서용권,문종춘 대한기계학회 1993 대한기계학회논문집 Vol.17 No.8
A numerical and experimental study has been performed on the flow in a shallow rectangular tank accompanying a vortex shedding. The model is composed of a rectangular tank with a vertical plate with a length half the width of the tank. The tank is subject to a horizontal sinusoidal oscillation. The numerical analysis shows that the pattern of vortex shedding changes considerably when the Reynolds number $R_e$ is varied from 500 to 7500. It is symmetric for $R_e$ <1500 and asymmetric for $R_e$ > 1500. The kinetic energies of the right-hand and left-hand sides of the vertical plate are used to quantify the degree of the asymmetry. Experimental visualization is carried out at $R_e$ = 3876 and 52000. The development of the streamline pattern at $R_e$ = 3876 is in closer agreement with the numerical result at $R_e$ = 1000 than that at $R_e$ =3876. The asymmetric pattern is observed at $R_e$ = 52000.
서용권,문종춘 대한기계학회 1994 대한기계학회논문집 Vol.18 No.2
Study on the chaotic stirring has been performed numerically and experimentally for a shallow rectangular tank accompanying a vortex shedding. The model is composed of a rectangular tank with a vertical plate with a length half the width of the tank. The tank is subject to a horizontal sinusoidal oscillation. The chaotic stirring was analysed by Poincare sections, unstable manifolds and Lyapunov exponents. As Reynolds number is increased the stirring effect is decreased due to the growth of a regular regions near the lower surface of the tank. In the other hand decrease of Reynolds number gives a weaker vortex shedding resulting in the poorer stirring effect. It was also found that the Lyapunov exponent is the highest at the dimensionless period of 1.3-1.5, which seems to be the best condition for the efficient stirring. The experimental visualization for the deformation of materials exhibits the striation pattern similar to the unstable manifold obtained numerically.