• 한국산업융합학회 논문집
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• 제24권5호
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• pp.573-579
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• 2021

In this study, flow analysis was performed on three types of strainers for ships with different flow rates to predict the pressure drop of the strainer due to the filter of strainer. In the case of flow analysis, the flow analysis was performed by applying the porous media method by applying the resistance value derived by Ergun's equation to the filter position. As a result of the analysis, it was found that when the dimensions of the strainer body were small, the influence of the flow rate on the pressure drop was large. In addition, the amount of pressure drop and the flow rate are almost linearly proportional, and an analysis formula that can predict the amount of pressure drop was derived. In order to predict the amount of pressure drop of the strainer when blockage exist in the strainer filter, the analysis was performed by introducing the resistance ratio to derive the prediction equation. Using this equation, it is thought that it will be possible to predict the performance of the strainer due to blockage in the future strainer design and field application.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1259-1260
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• 2011

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2011년도 전기공동학술대회 논문집
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• pp.280-280
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• 2011

• Nuclear Engineering and Technology
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• 제51권5호
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• pp.1345-1354
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• 2019

Clogging of sump strainers that filter the recirculation water in containment after a loss-of-coolant accident (LOCA) seriously impedes the continued cooling of nuclear reactor cores. In experiments examining the corrosion of aluminium alloy 6061, a common material in containment equipment, in borated solutions simulating the water chemistry of sump water after a LOCA, we found that Fe-bearing intermetallic particles, which were initially buried in the Al matrix, were progressively exposed as corrosion continued. Their cathodic nature $vis-{\grave{a}}-vis$ the Al matrix provoked continuous trenching around them until they were finally released into the test solution. Such particles released from Al alloy components in a reactor containment after a LOCA will be transported to the sump entrance with the recirculation flow and trapped by the debris bed that typically forms on the strainer surface, potentially aggravating strainer clogging. These Fe-bearing intermetallic particles, many of which had a rod or thin strip-like geometry, were identified to be mainly the cubic phase ${\alpha}_c-Al(Fe,Mn)Si$ with an average size of about $2.15{\mu}m$; 11.5 g of particles with a volume of about $3.2cm^3$ would be released with the dissolution of every 1 kg 6061 aluminium alloy.

• 동력기계공학회지
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• 제19권4호
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• pp.5-10
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• 2015

Dust collector is one of the most widely used equipment among the method of separating particles, it filters exhaust gas having various kinds of dusts through several filters installed on parallel. This research investigated the moving characteristic of Honeycomb-type carbon filter in pressure drop of smoking collector's ventilation system. It also compared pressure transmission coefficient through pressure drop according to flow velocity change.

• Journal of Advanced Marine Engineering and Technology
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• 제37권4호
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• pp.358-367
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• 2013

본 논문에서는 타공판으로 구성된 필터의 전부 또는 일부를 다공성 매질로 대체하고 Forchheimer 법칙에 따라 판의 수직방향과 횡방향으로 손실계수를 부과하여 스트레이너를 지나는 유동의 압력 강하량를 정확히 예측할 수 있는 다공성모델링 기법을 적용하고 그 유효성을 확인하였다. 먼저 간단한 파이프 유동 해석을 통하여 수직방향 손실계수를 구하였다. 이어 필터 내에 반복되는 타공판 형상과 유동손실특성을 공유할 수 있는 단위주기 형상을 설정하고, 설정된 단위형상에 대하여 원형과 다공성모델 수치모사를 각각 수행한 후, 얻어진 두 결과를 서로 비교하여 횡방향 손실계수를 구하였다. 적용된 다공성모델링 기법을 검증하기 위하여 스트레이너 전체형상에 대하여 다공성모델 수치모사를 수행하였으며, 그 해석결과를 원형 수치모사 결과와 직접 비교하였다. 비교 결과, 다공성모델링 기법은 압력 강하량과 유동특성을 비교적 정확히 예측하였으며 계산비용과 직결되는 노드 수는 약 3~4배 정도 줄일 수 있었다.

• 한국기계가공학회지
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• 제12권5호
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• pp.67-75
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• 2013

This study is flow analysis on the smoke collector in smoking room. The smoke collector for improving impure air at smoking area is analyzed and the inner flow filed in smoke collector is confirmed on the study result. The velocity with pressure distribution according to suction flow rate at filter entrance is also compared. Pressure characteristic and pressure resistance coefficient are analyzed according to flow analysis result for each other filter. The pressure drop of about 15 Pa occurs at the normal driving mode to strainer inlet from HEPA filter outlet. On the other hand, the pressure drop about 44% increases at turbo mode.

• 한국유체기계학회 논문집
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• 제2권4호
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• pp.40-47
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• 1999

A hot water layer (HWL hereinafter) was installed at the depth of 1.2 m from the pool surface to reduce the radiation level at the pool top. After the HWL system was improved by the replacement of the filter with the Ion Exchanger to capture the Na-24, to purify the pool water of HWL and finally to reduce the radiation at the pool top. It was confirmed by the performance test of the pump and the measurement of the pressure difference through the Ion Exchanger and the strainer, that the flow characteristics of HWL system was not adversely affected after the system modification. Also the flow analysis using the pressure loss coefficients of the Ion Exchanger and strainer, calculated by the Darcy formula, could predict the flow variations by pressure changes within $10\%$ error in comparison with the field test results. It was also confirmed that HWL was maintained with the depth of 1.2 m from the pool surface because each electric water heater was electrically and thermodynamically maintained at 30 kW and the temperature of HWL was maintained with $5^{\circ}C$ higher temperature than that of pool water. Finally, it was confirmed that the pool top radiation was saturated and stabilized below 10000 nG/hr within 24 hours as the ion exchanger captured the main nucleus, Na-24 and purified the pool water of HWL.

• 한국수산과학회지
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• 제10권4호
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• pp.275-279
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• 1977

전성장실험기간을 통하여 잉어의 먹이 섭취와 성장 및 사료효율은 스트레이너의 지소회수, 오탁된 사육수의 교환정도, 먹이의 분할공급의 회수, 적량내의 먹이 공급 및 용존산소량에 직접적이고 직각적인 반응을 나타내었다. 그러나 지소나, 물 교환을 위한 취급에는 별로 영향을 받지 않는 것으로 보였다. 특히 해로운 점은 식욕이 왕성하지 못할 때 먹이를 주는 일과 일시에 과량의 먹이는 주는 것이었다. 특히 직각적으로 삼킬 수 있는 량을 주면 물에 녹아나는 것이 거의 없고, 먹이를 준 후에도 물이 투명하지만, 그 이상의 먹이를 주면 식욕이 왕성할 때는 입속에 여분의 먹이를 머금고 삼킬 노력을 함으로써 녹아서 물에 흩어져 나오는 량이 많고, 먹이를 준 후 물이 혼탁해 진다. 그리하여, 여과조를 포함한 사육수질을 악화시키고, 성장이 불량해지고, 또 사료의 효율을 심하게 저하시킨다.

• 한국가스학회지
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• 제2권1호
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• pp.47-52
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• 1998

천연가스 공급배관내의 이물질을 제거하기 위하여 한국가스공사에서는 현재 250um 공극 크기를 갖는 금속 스트레이너형의 필터를 사용하고 있다. 하지만 배관내의 이물질 크기를 조사한 결과 필터 공극 크기보다 작은 이물질이 상당량 있는 것으로 파악되었으며. 따라서 이들 이물질로 인하여 필터 후단부의 각종 밸브류나 계 량 측정 기기들에 악영향을 미치고 있는 실정이다. 미세한 크기의 이물질들을 없애기 위해서는 필터의 공극 크기를 줄여야 하는데. 이 경우에는 필터 전, 후단의 차압발생으로 인하여 원하는 유량의 가스를 공급하기 어려운 일이 생길 수 있으므로 차압발생을 신중히 고려하여 필터 공극 크기를 결정하여야한다. 본 연구에서는 손실계수 K를 이용하여 가스필터의 성능평가 방법을 제시하였다.