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중국 첨단산업단지의 기술개발 및 상용화에 대한 조사
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Osteosynthesis of traumatic manubriosternal dislocations and sternal fractures with a 3.5/4.0 mm fixed-angle plate (LCP)
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Lack of the CD8^+ cell anti-HIV factor in CD8^+ cell granules
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Tarif de référence et entrée des génériques : l’impact sur les prix des médicaments en Algérie
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물리-정보 기반 인공신경망을 이용한 4D Flow MRI 고해상도화
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- 저자 : 정재달(Jaedal Jeong) (검색결과 3 건)
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정재달(Jaedal Jeong),조성기(SeongGee Cho),이창훈(Changhoon Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The motion of a small rigid particle in the shear flow near a stationary flat wall is investigated in the context of Stokes flow. The lift force proposed by Saffman(1965) and later modified by Mclaughlin(1991) and Mei(1992) is considered in the prediction of the particle motion far away from the wall. Later, the expression of the lift force is modified to take into account the effect of wall(Cherukeat and Mclaughlin, 1994). In the analysis gravity, lift and drag acting on a small particle near a wall are taken into account. Both analytical and numerical results for the terminal velocities, distances from the wall and trajectories of the particle after the enough lapse of time are presented. Especially, the initial velocity and distances from the wall is important parameters in determining behavior of particles in the shear flow near a wall.
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정재달(Jaedal Jeong),여경민(Kyongmin Yeo),이창훈(Changhoon Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Particle-laden turbulence is frequently observed in nature such as the atmosphere and ocean, as well as in many engineering flows. Recently, as the dispersion of pollutant in environmental problem is of more interest, the study on the particle-laden turbulence is more important both for predicting the behavior of particles and for understanding the fundamental characteristics. Isotropic turbulence is a good example of turbulence for understanding its the properties because if Reynolds number is high, small scale turbulence has universal characteristics of isotropic turbulence without relevance to large scale turbulence. Thus, using direct numerical simulation of particle-laden isotropic turbulence, we investigate the correlation of fluid velocities along particle trajectories for finding fluid-particle interaction mechanism. Furthermore, the results of present study can be applied to development of a solid particle dispersion model.
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정재달(Jaedal Jeong),여경민(Kyongmin Yeo),이창훈(Changhoon Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Particle suspension is frequently observed in many natural flows such as in the atmosphere and the ocean as well as in various engineering flows. Recently, airborne micro or nano-scale particles in atmosphere attract much attention from environmental society since small particle cause serious environmental problems in the industrialized areas. Also, such heavy particles' behavior is quite different from its pure fluid particles because the inertia force and buoyance force acting on the heavy particles are different than those acting on fluid particles, so that heavy particles do not follow the trajectories of the fluid particle. Therefore, our studies is to investigate the characteristics of the behavior of heavy particles considering the inertia effect under gravity. However, we do not consider modification of turbulence by the particles, that is one-way interaction. We carried out direct numerical simulation of isotropic turbulence with particles under the Stokes drag assumption for a spherical particle. These results can be used in the development of a stochastic model for predicting particle's dispersion.
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