• 대한기계학회논문집B
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• 제38권7호
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• pp.581-588
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• 2014

본 논문에서는 원통-다관형 열교환기의 다관측 유량의 분배도 향상을 위해 다공성 배플 유무에 따른 입구 및 출구부의 유동 특성을 실험적으로 연구하였다. 원통 및 다관측 유량의 분배성능은 원통-다관형 열교환기의 성능에 직간접적인 영향을 준다. 실험 연구를 위하여 원형 크기의 1/3로 축소한 실험 모델을 제작하였고, 60, 80, 90 LPM의 유량 조건에서 다공성 배플의 유무에 따른 다관측의 분배 성능을 입자화상속도기법을 이용한 입구 및 출구부의 속도장 측정을 통해 확인하였다. 연구로부터 절대 불균일 분배도를 계산하여 정량적으로 다공성 배플이 유량의 분배도에 주는 영향을 확인하였다. 측정 결과로부터 유량에 상관없이 배플을 설치하였을 경우 74%의 절대 불균일 분배도의 감소 효과를 가졌다.

• 한국전산유체공학회지
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• 제14권2호
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• pp.68-76
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• 2009

The sloshing tank causes the instability of the fluid flows and the fluctuation of the impact pressure by the liquid on the tank. These flow characteristics inside the sloshing tank can generate the uncomfortable sloshing noise. In the present study, a numerical analysis for the reduction of a fuel tank sloshing noise was performed. To simulate the flow characteristics in a sloshing tank with partially filled liquid, a VOF method was used for interfacial flows by applying a momentum source term for the sloshing motion in a non-inertial reference frame. This numerical method was verified by comparing its results with the available experimental data. For the reduction of the sloshing noise, the horizontal and vertical baffles and porous media inside a sloshing tank were considered and numerically analyzed in the present study. For various installations of these baffles and porous media, the characteristics of the liquid behavior in the sloshing tank were obtained along with the impact pressure on the wall and the height of the free surface along the wall. These basic results can be used for the design of the actual vehicular fuel tank with the reduced sloshing noise.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2009년 춘계학술대회논문집
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• pp.215-222
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• 2009

In the present study, a numerical analysis on the sloshing in a tank with the harmonic motion was investigated. A VOF method was used for two-phase flows inside the sloshing tank and a source term of the momentum equation was applied for the harmonic motion. This numerical method was verified by comparing its results with the available experimental data. The sloshing in a tank causes the instability of the fluid flows and the fluctuation of the impact pressure on the tank. By these phenomena of the tank sloshing, the sloshing problems such as the failure and the noise of system can be generated. For the reduction of these sloshing problems, the various baffles such as the horizontal/vertical plate baffles and the porous baffles inside the tank are installed. With the installations of these baffles, the characteristics of the liquid behavior in the sloshing tank, the impact pressure on the wall, the amplitude of the free surface near the wall and the sloshing noise were numerically analyzed.