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가상경계 격자 볼츠만 법을 이용한 채널 내 자유 낙하하는 2차원 원형 실린더의 운동 특성
정해권(Haekwon Jeong),하만영(Manyeong Ha),윤현식(Hyunsik Yoon),김성줄(Sungjool Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The two-dimensional circular cylinder freely falling in a channel has been simulated by using Immersed boundary ? lattice Boltzmann method in order to anal yze the characteristics of motion originated by the interaction between the fluid and the solid. The wide range of the solid/fluid density ratio has been considered to identify the effect of the solid/fluid density ratio on the motion characteristics such as the falling time, the terminal velocity and the trajectory in the vertical and horizontal directions. In addition, the effect of the gap between the cylinder and the wall on the motion of two-dimensional circular cylinder freely falling has been revealed by taking into account a various range of the gap size. The Reynolds number in terms of the terminal velocity is diminished as the cylinder becomes close to the wall at the initial dropping position, since the repulsive force induced between the cylinder and wall constrains the vertical motion. Quantitative information about the flow variables such as the pressure coefficient and vorticity on the cylinders is highlighted.
폐타이어 재활용 처리를 위한 열분해 열병합 복합공정기술개발
김성연(SeongYeon Kim),하만영(ManYeong Ha) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The thermochemical recycling of waste tires by pyrolysis is studied to recover the value added three by-products; a pyrolytic carbon black, a pyrolytic oil, and a non-condensable gas. The exhausted energy from pyrolysis of waste tires is converted for electricity power and process steam in cogeneration system. The characteristics of the pyrolysis recovered by-products as alternative energy resource are investigated with the design of a demonstration and a commercialization plant including cogeneration system, as called integrated pyrolysis cogeneration system.
김성연(SeongYeon Kim),하만영(ManYeong Ha) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The thermal process of wastes with higher calorific value by pyrolysis is reviewed to recover the value added three by-products; a pyrolytic char, a pyrolytic oil, and a non-condensable gas. These by-products from pyrolysis of the waste is converted for electricity power and thermal energy thru gasification process as well as waste heat recovery process. The energy resource and several processes in the integrated pyrolysis gasification combined cycle for waste treatment are investigated with the conceptual design in using the obtained operation data from the pyrolysis pilot, demonstration and commercial plant.
채널 내 자유 낙하하는 2차원 원형 실린더의 운동 특성에 관한 수치적 연구
정해권(Haekwon Jeong),윤현식(Hyunsik Yoon),하만영(Manyeong Ha) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.7
A two-dimensional circular cylinder freely falling in a channel has been simulated by using immersed boundary ? lattice Boltzmann method (IB-LBM) in order to analyze the characteristics of motion originated by the interaction between the fluid flow and the cylinder. The wide range of the solid/fluid density ratio has been considered to identify the effect of the solid/fluid density ratio on the motion characteristics such as the falling time, the transverse force and the trajectory in the streamwise and transverse directions. In addition, the effect of the gap between the cylinder and the wall on the motion of a two-dimensional freely falling circular cylinder has been revealed by taking into account a various range of the gap size. As the cylinder is close to the wall at the initial dropping position, vortex shedding in the wake occurs early since the shear flow formed in the spacing between the cylinder and the wall drives flow instabilities from the initial stage of freely falling. In order to consider the characteristics of transverse motion of the cylinder in the initial stage of freely falling, quantitative information about the cylinder motion variables such as the transverse force, trajectory and settling time has been investigate.