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수직ㆍ수평 관통류를 갖는 수평 다공층에서 자연대류 연구
서석진(S.J. Seo),박찬국(C.K. Park) 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.1
The effect of vertical or horizontal throughflow on natural convection in horizontal porous layer was investigated. The computations were performed by employing Darcy-Brinkman-Forchheimer equation to consider the effect of inertia and viscous effect. The patterns of streamlines and isotherms are observed by changing the strength of throughflow. The vertical throughflow stabilizes the natural convection in porous layer. It also disturbs the developing vertical and horizontal velocity component of natural convection cell and increases the critical modified Rayleigh number. The horizontal throughflow influences the stabilization of natural convection in porous layer much more than the vertical throughflow. And it changes a stable convection into a oscillatory convection.
수직ㆍ수평 관통류를 갖는 수평 다공층에서 자연대류 연구
서석진(S.J. Seo),박찬국(C.K. Park) 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.1
The effect of vertical or horizontal throughflow on natural convection in horizontal porous layer was investigated. The computations were performed by employing Darcy-Brinkman-Forchheimer equation to consider the effect of inertia and viscous effect. The patterns of streamlines and isotherms are observed by changing the strength of throughflow. The vertical throughflow stabilizes the natural convection in porous layer. It also disturbs the developing vertical and horizontal velocity component of natural convection cell and increases the critical modified Rayleigh number. The horizontal throughflow influences the stabilization of natural convection in porous layer much more than the vertical throughflow. And it changes a stable convection into a oscillatory convection.
유한요소법을 이용한 순수 물의 상변화 과정에 대한 수치해석
홍영대(Y. D. Hong),차경세(K. S. Cha),서석진(S. J. Seo),박찬국(C. G Park) 한국전산유체공학회 2002 한국전산유체공학회지 Vol.7 No.4
The phase-change transformation processes are relevant in many engineering applications. In particular, this phenomenon plays an important role in the extraction and fabrication operations in the metallurgical industry- The control of the heat transfer and fluid flow patterns is important to achieve casting Quality and competitive production times. In the present study, a simple finite-element algorithm is developed for solid-liquid phase change problems. Natural convection in the liquid phase due to the temperature dependency of water density is considered by a numerical model. The predictions are compared with measurements by the particle image velocimetry(PIV). to show that the calculation results are in good agreement with the experiment results.