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지하철 객실 내 에어커튼의 미세먼지 차단 효용성의 수치해석 연구
현예솔,오근우,양민규,최지용,최정일 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.4
This study evaluates the effectiveness of air curtains in alleviating contaminant infiltration to subway cabins when doors are opened. We perform numerical simulations of contaminant transports in the subway station under various conditions(passenger ingress, air curtain operation, seasonal effect, and pressurized cabin). The performance of the air curtain is assessed based on mass transfer rate and separation efficiency. Air curtain-induced air flows promote particle infiltrations into the cabin by lowering the cabin pressure. However, the temperature and pressure differences between in and out of the cabin do not significantly affect the separation efficiency, except for no air curtain operation.
호흡주기 동안 방독면 내 호흡저항 및 내부 온도 변화에 대한 수치해석 연구
오근우,현예솔,최정일,이재헌,김민건,정희수 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.2
We perform numerical simulations of unsteady thermal flows inside a gas mask. Time-dependent respiratory profiles for normal and heavy breathing conditions are imposed at two different inlets, depending on the exhalation and inhalation periods. We assess the respiration resistance (pressure drops) and the regional averaged temperature, considering the effects of nosecup in the gas mask. Simulation results show that the nosecup significantly reduces the exhaled hot airflows to the eye area, reducing the temperature to approximately 26.5°C. In contrast, the maximum of the averaged temperature inside the nosecup is increased by less than 3.6°C during the exhalation period. Under normal and heavy breathing conditions, the nosecup-induced pressure drops during inhalation are approximately 4 Pa and 20 Pa, respectively. However, the induced pressure drops are relatively small than expected from an air purification filter. Thus, the results imply that the nosecup can improve visibility by reducing condensation near the goggles while it can slightly worsen breathing and thermal comfort.