• Korean Chemical Engineering Research
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• v.48 no.3
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• pp.337-341
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• 2010

The flow patterns in a stirred tank, 1m in diameter and 1 m in height, were studied using CFX, a commercial computational fluid dynamics program, with the impeller rotation speed, the impeller blade angle and the tank-bottom shape varied and the baffles included or excluded. A vortex was observed in the center of the tank in the absence of the baffles, and the intensity of the vortex increased with increasing the rotation speed. The vortex was considerably reduced in the presence of the baffles. An increase in the blade angle increased the vertical flow and decreased the vortex intensity. The flow in the corners of the tank bottom turned smoother as the tank bottom was varied in shape from flat to round.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.12 no.6
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• pp.37-44
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• 2013

Friction stir welding (FSW) is a solid state joining technique that has expanded rapidly since its development in 1991 and has numerous applications in a wide variety of industries. This paper introduces the basic principles of friction stir welding (FSW) and presents a survey of the latest technologies and applications in the field. The basic principles that are discussed include the terminology, tool/workpiece processes, FSW merits and process variants. In particular, the process variants including the rotation speed and traveling speed are discussed, which include the defect-free zone in an oxygen free copper and Al alloy, respectively. Multiple aspects of the FSW machine are developed, including a horizontal 2D FSW machine and a hybrid complex FSW machine. The latest applications are introduced, with an emphasis on the recent advances in the aerospace, automotive, and IT display industries. Finally, the direction for future research and potential applications are examined.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.11a
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• pp.76-77
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• 2012

전기 도금 시스템에서 전산모사 해석을 이용하여 도금층 두께를 정확히 예측하기 위해서 음극 표면의 확산층이 고려된 도금 Simulator를 개발하였다. 특정 형상의 경우 도금액 교반이 원활하지 않아 불균일한 도금이 이루어지는 경우가 있기 때문에 이를 예측하기 위해서는 교반 영향을 나타내는 확산층을 고려해야 한다. 유동해석을 통해 도금액 교반 조건 및 형상에 따른 음극 표면의 유속을 결정하고 유속별 도금액 DB를 구성하여 음극의 위치별 분극곡선을 차별화하여 유동 조건에 따른 확산층 변화를 고려하는 형태로 구현하였다. 유속별 도금액 DB는 실험 데이터 및 해석 데이터를 종합하여 구축하였다. 교반의 영향을 많이 받는 시스템을 대상으로 개발된 Simulator 결과의 타당성을 검증하였고 확산층 적용에 따른 도금 결과의 차이를 확인하였다.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2005.05a
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• pp.162-167
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• 2005

초산, 질산, 인산이 함유된 폐혼산으로부터 인산을 분리하여 재활용하기 위한 방법으로 용매추출법을 이용하였다. 폐혼산에서 초산과 질산을 선택적으로 분리하고, 추출 잔류액에서 인산을 회수하고자 하였다. 주요 실험 변수로는 추출제농도, 교반시간, 교반속도 등의 변화에 따른 초산, 질산, 인산의 추출거동을 조사하였다. 또한, McCabe-Thiele diagram으로부터 초산, 질산 성분의 추출 및 탈거에 필요한 이론적 단수를 조사하였다. 실험결과 인산염계 추출제를 사용할 경우 초산과 실산을 선택적으로 분리 추출이 가능하였으며, 추출제의 함량은 유기상의 50%가 적합하였다. 교반속도와 교반시간의 영향은 크게 없었으며, 상비(A/O)=1/3, 6단에서 초산과 질산을 완전히 추출 분리하여 인산을 추출잔류액에서 회수가 가능하였다.

• The Korean Journal of Rheology
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• v.10 no.1
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• pp.1-6
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• 1998

액체와 액체를 교반할 경우 혹은 두가지 이상의 상이 함께 반응하는 화학공정의 경 우에서는 비상용성인 액체들을 난류조건하에 분산시켜 섞이게 한다. 부산계로 구성된 중합 반응기의 경우 분산입자의 크기는 최종제품의 생산성 및 품질에 큰 영향을 미치게 되므로 분산입자의 크기를 예측하는 것은 대단히 중요하다. 이러한 분산계에서 분산입자의 크기는 분산입자가 겪는 유동장에 의해 결정된다. 오일/오일 분산계로 이루어진 고분자 유탁액의 난류교반시 유동장은 종종 점성전단 부영역에 속하게 되는데 이경우의 분산입자의 크기를 예측하는 모델에 대한 연구는 별로 이루어지지않았다. 본연구에서는 오일/오일 분산계의 고 분자 유탁액에 대한 분산입자의 크기를 예측하는 모델식을 유체동력학적인 이론을 배경으로 하여 개발하였다. 개발한 모델식을 난류교반을 겪은 오일/오일 분산계를 거쳐 생산된 제품 인 내충격성 폴리스티렌으로 검증하여 모델식의 타당성을 입증하였다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.155-156
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• 2013

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.6
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• pp.775-782
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• 2013

In this study, as a series of studies aimed at investigating the spatial randomness of fatigue crack growth for friction stir welded (FSWed) 7075-T651 aluminum alloy joints, the fatigue crack growth behavior of FSWed 7075-T651 aluminum alloy joints was investigated for LT orientation specimens. Fatigue crack growth tests were conducted under constant stress intensity factor range (SIFR) control for 5 specimens of the FSWed 7075-T651 aluminum alloy, including base metal (BM), heat affected zone (HAZ), and weld metal (WM) specimens. The mean fatigue crack growth rate of WM specimens was found to be the highest, whereas that of HAZ and WM specimens was the lowest. Furthermore, the variability of fatigue crack growth rate was found to be the highest in WM specimens and lowest in BM specimens.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.10
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• pp.1347-1353
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• 2011

Friction stir welding (FSW) method has extensively been used in manufacturing methods because of the several advantages over conventional welding methods, such as better mechanical properties, reduced occurrence of joining defects, high material saving, and low production time, etc. The aim of this paper is to review the optimal FSW conditions using the previous experimental results and is to investigate the fatigue crack growth rate in three different zones, WM, HAZ and BM for FSWed Al7075-T651 aluminum plates. As far as our experiments are concerned, the optimal conditions are obtained as rotation speed, 800rpm and travelling speed, 0.5mm/sec. The fatigue crack growth rate showed strong dependency on three different zones WM, HAZ and BM, and crack driving force.

• Journal of the Korea Organic Resources Recycling Association
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• v.28 no.4
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• pp.69-75
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• 2020

This study was conducted to improve the solid-liquid separation efficiency of clarifiers. To do so, the study did a bio-flocculation experiment simply by controlling the stirring speed (rpm) and baffle angle of a clarifier on a lab scale, but without using a coagulant. For the purpose of the experiment, the feed wall of a clarifier was so improved that a baffle could be installed on the clarifier. Then, it was ensured to change its stirring speed (to 0.0rpm, 0.6rpm, and 1.2rpm), with the angle fixed at 10°. As a result, it was found that concentration efficiency increased by 2.0%, and effluent removal efficiency (SS concentration) by 7.8%, at a stirring speed of 0.6ppm. This indicates the bio-coagulation efficiency of sludge increased with changing stirring speeds. Then, the baffle angle of the sedimentation unit was changed to analyze how the changed baffle angle would affect the sedimentation of sludge. As a result, it was found that the compression of sludge interface was very effective at a baffle angle of 20°. It is hoped that these experimental findings will be useful in improving the sedimentation efficiency of circular clarifiers.

• Journal of the Korean Geotechnical Society
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• v.23 no.7
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• pp.99-104
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• 2007

The deep soil mixing, on ground modification technique, has been used for many diverse applications including building and bridge foundations, port and harbor foundations, retaining structures, liquefaction mitigation, temporary support of excavation and water control. This method has the basic objective of finding the most efficient and economical method for mixing cement with soil to secure settlements through improvement of stability on soft ground. In this research, the experiments were conducted on a laboratory scale with the various test conditions of mixing method; the angle of mixing wing, mixing speed. Strength and shapes of improved soil of these test conditions of deep mixing method were analysed. From the study, it was found that the mixing conditions affect remarkably to the strength and shapes of improved soils.