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굴착유체의 Slim Hole 환형관 내 유동특성에 관한 연구
서병택,우남섭,황영규 대한설비공학회 2006 설비공학 논문집 Vol.18 No.4
The paper concerns an experimental study of fully developed laminar flow of a Newtonian and non-Newtonian liquid in concentric annuli with combined bulk axial flow and inner cylinder rotation. Pressure losses and skin friction coefficients have been measured for Newtonian fluid, water and non-Newtonian fluids, 0.2% aqueous of sodium carboxymethyl cellulose(CMC) and 5% bentonite solutions, when the inner cylinder rotates at the speed of 0∼500rpm. The influences of rotation, radius ratio and working fluid on the annular flow field are investigated. And the new correlations among the skin friction coefficient, the Reynolds number and the Rossby number are presented with reasonable limits of accuracy in laminar flow regime.
산업용 질소발생기에 대한 청정소화설비로의 적용가능성에 관한 연구
서병택,장영근 한국화재소방학회 2010 한국화재소방학회논문지 Vol.24 No.2
An experimental study has been carried out to investigate the possibilities of an industrial N2 generator that it replace Halon series as a natural extinguishing system. And this study comparison design standard of gas series extinguishing system with natural extinguishing system. We manufactured simple protected enclosure for analyzing fire-extinguishing performance of the N2 generator. As a N2 gas is exhausted on protected enclosure, a various of Oxygen concentration is measured to analyze fireextinguishing performance experimentally. The results, in case of 100 m3 protected enclosure and 5 m3/min N2 flow rate, the Oxygen concentration is decreased below 15% within 3 minutes. And so,the N2 generator make full use of an suffocating extinguishing system. 본 연구에서는 산업용으로 일반적으로 사용하고 있는 질소발생기를 사용하여 할론 계열의 소화약제를대체할 청정소화설비로 적용할 수 있는지에 대한 소화성능 실험을 간단히 수행하였다. 산업용 질소발생기의 소화성능을 분석하기 위하여 간단한 방호구역을 제작하여 실제 질소발생기에서 발생하는 질소가스를방사하면서 방호구역 내의 산소농도 변화를 실험적으로 파악하였다. 실험결과, 현재 많이 사용하고 있는질소발생기로 방호구역 100m3에 대하여 질소가스를 5m3/min로 방사하면 3분 이내에 방호구역 내의 산소농도를 15% 이내로 낮추어 질식소화가 충분히 가능하다.
환형관내 굴착유체의 편심회전유동에 관한 수치해석적 연구
서병택,장영근,김덕주 한국기계기술학회 2011 한국기계기술학회지 Vol.13 No.4
The paper concerns numerical study of fully developed laminar flow of a Newtonian water and non-Newtonian fluids, 0.2% aqueous of sodium carboxymethyl cellulose(CMC) solution in eccentric annuli with combined bulk axial flow and inner cylinder rotation. Pressure losses and skin friction coefficients have been measured when the inner cylinder rotates at the speed of 0~200 rpm. A numerical analysis considered mainly the effects of annular eccentricity and inner cylinder rotation. The present analysis has demonstrated the importance of the drill pipe rotation and eccentricity. In eccentricity of 0.7 of a Newtonian water, the flow field is recirculation dominated and unexpected behavior is observed. it generates a strong rotation directed layer, that two opposing effects act to create two local peaks of the axial velocity. The influences of rotation, radius ratio and working fluid on the annular flow field are investigated.