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박준길(Jun-Gil Park),서상호(Sang-Ho Suh),조민태(Min-Tae Cho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The pneumatic waste collection system, which is a complete solution for solving the waste collection problems, are constructed in many countries all over the world. However, research data for piping network design are insufficient. In this paper the pressure losses of the straight and curved pipes, pipe junctions are obtained using the numerical method in order to investigate the optimal pipe network design for the waste collection system.
박준길(Jun-Gil Park),서상호(Sang-Ho Suh),노형운(Hyung-Woon Roh),이병권(Byung-Kwon Lee),권혁문(Hyuck-Moon Kwon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The distributions of the wall shear stress and OSI in the bifurcated artery are investigated under physiological flow condition. The present study is also aimed to establish the atherogenic risk assessment according to the change of whole blood viscosity. Computer Simulations were performed to obtain the values of wall shear stress and OSI in the bifurcated artery. The generation of atherosclerosis are related to not only biochemical reaction between blood and blood vessel but also the hemodynamic factors like flow separation and oscillatory wall shear stress.
고발포 소화약제 사용 실험에 의한 지하공동구 화재진압방법 연구
박준길(Joon Gil Park),이민철(Min Chul Lee) 한국화재소방학회 2022 한국화재소방학회논문지 Vol.36 No.6
본 연구에서는 실스케일의 지하공동구 실험체를 대상으로 고팽창포 발포실험을 수행하고, 지하공동구 화재 시 고발포 소화약제의 방사⋅발포특성을 이해함으로써 효과적인 화재대응방안을 제시코자 하였다. 한 곳에서 고발포 폼을 발포하였을 경우 포 소화약제 환원시간에 도달하며, 약 4 min 만에 포가 깨어지기 시작하였다. 반면, 실험체의 세 곳에서 고발포 폼 관창을 이용하여 폼을 집중 발포하였을 경우, 650 L의 소화약제를 사용하여 7 min 만에 실험체를 모두 채울 수 있었다. 또한 셀라관창 실험에서는 관창을 맨홀에 수직으로 삽입하여 방사하는 것보다는 관창을 수평에 가깝게 삽입하여 방사하는 것이 연기 및 열기를 밀어내도록 하는데 효과적임을 확인하였다. This study conducted a discharging experiment of high-expansion foams at a real-scale experimental underground utility tunnel and proposed an effective fire response plan. The study analyzed the discharge and foaming characteristics of high-expansion foam in the event of an underground utility tunnel fire. When high-expansion foams were injected at one point, foam agents started to break out four minutes after reaching reduction time. Meanwhile, when high-expansion foams were injected at three points, the experimental tunnel was filled entirely after seven minutes using 650 L of extinguishing agent. Moreover, in the cellar nozzle experiment, discharging from a nozzle injected horizontally to a manhole was more effective than that from a nozzle vertically injected to push smoke and heat.