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마이크로 채널 내 혼합부 형상이 2상 유동 양식에 미치는 영향에 대한 연구
이관근(Kwan Geun Lee),이준경(Jun Kyoung Lee),박태현(Taehyun Park),김교남(Gyo Nam Kim),박은주(Eun Ju Park) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.2
The effect of inlet mixer geometries on the two-phase flow patterns in square micro-channel with 600×600 ㎛ was investigated experimentally in this paper. The 4 different mixer configurations based on the Y, Impacting, and two T types (gas and liquid inlets were switched) were used. The test fluids were nitrogen and water. The liquid and gas superficial velocities were 0.01~10 m/s and 0.1~100 m/s, respectively. Several distinctive flow patterns, namely, annular, slug-annular, slug, slug-bubbly, bubbly, and churn flow could be seen. The flow pattern maps for each mixer were suggested, and it can be concluded that two-phase flow patterns are not very sensitive to the mixer geometries. But the mixing behaviors of gas and liquid for each mixer were different for slug and bubbly flow. Thus, the characteristics of slug and bubble for each case were not same.
마이크로 채널 내 T 형 혼합부 형상에 따른 2상 유동 양식 변화에 대한 기초 연구
이관근(Kwan Geun Lee),이준경(Jun Kyoung Lee),박태현(Tae Hyun Park),윤창식(Chang Sik Yoon),방영준(Young Jun Bang),신환준(Hwan Jun Shin) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The effect of inlet mixer geometries on the two-phase flow patterns in square micro-channel with 600 × 600 ㎛ is investigated in this paper. The inlet configurations based on the T-junction with three different branch 400, 600 and 1200 ㎛ in width were used. The test fluids were nitrogen and water. The superficial velocities cover a broad range of 0.01 - 10 m/s for liquid superficial velocity and 0.1 - 100 m/s for gas superficial velocity. Several distinctive flow patterns, namely, annular flow, wavy flow, slug-annular flow, slug flow, slug-bubbly flow, bubbly flow, churn flow are identified, and their special features are described. It has been confirmed that two phase flow patterns are sensitive to the inlet geometries.
마이크로 채널 내 혼합부 형상이 2상 유동 양식에 미치는 영향에 대한 기초 연구
이관근(Kwan Geun Lee),이준경(Jun Kyoung Lee),신환준(Hwan Jun Shin),이창빈(Chang Bin Lee) 대한설비공학회 2014 대한설비공학회 학술발표대회논문집 Vol.2014 No.6
The effect of inlet mixer geometries on the two-phase flow patterns in square micro-channel with 600 × 600 ㎛ was investigated in this paper. The 4 different mixer configurations based on the Y, Impacting, and two T types(gas and liquid inlets were switched) were used. The test fluids were nitrogen and water. The liquid and gas superficial velocities were 0.01 - 10 m/s and 0.1 - 100 m/s, respectively. Several distinctive flow patterns, namely, annular flow, slug-annular flow, slug flow, slug-bubbly flow, bubbly flow, churn flow could be seen. The flow pattern maps for each mixer were suggested, and it can be concluded that two-phase flow patterns are not very sensitive to the mixer geometries. But the mixing behaviors of gas and liquid for each mixer were different for slug and bubbly flow, thus the characteristics of slug and bubble for each case were not same.
배플이 설치된 잠수함 압축기용 오일 냉각기의 전열 성능에 관한 수치연구
이관근(Kwan Geun Lee),이준경(Jun Kyoung Lee),방영준(Young Jun Bang),신환준(Hwan Jun Shin),장덕호(Deok ho Jang),정금수(Keum Soo Jeong) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Ultra high pressure air compressor for special ships, including submarines needs to be developed to reduce the weight and volume. Related with the components of new type compressor, it is necessary to develop the shell and tube type heat exchanger(HX) for cooling compressor oil. For the shell and tube type HX without baffle, by utilizing commercial software ANSYS Fluent, we could verify that the experimental results were relatively well predicted comparing with the CFD results. Furthermore, the cooling performances were calculated for the shell and tube type HX with some cases of baffle numbers and area. The cooling performance of the HX with baffle was higher than that of the HX without baffle. But the effect of baffle numbers was minor. And the cooling performance increases with larger baffle area. But the pressure drop of cooling water increases with increase of baffle numbers and area. From the results of case study, the optimum baffle numbers and area for the high cooling performance could be suggested.
사각 마이크로 채널 내 Taylor flow의 기포 및 액체 슬러그 유동 특성에 대한 연구
이관근(Kwan Geun Lee),이준경(Jun Kyoung Lee),신환준(Hwan June Shin),이창빈(Chang Bin Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The characteristics of gas-liquid Taylor(Slug) flow in a square micro-channel with 600 × 600 ㎛were investigated experimentally in this paper. The test fluids were nitrogen and water. The liquid and gas superficial velocities were 0.01 - 3 m/s and 0.1 ? 3 m/s, respectively. Bubble and liquid slug lengths, bubble velocity and frequency were measured by analyzing the optical images using high speed camera. The bubble length was decreased with higher liquid flow rate and that was increased with higher gas flow rate, dramatically. But the slug length was not varied with the changes of inlet conditions. And the bubble velocity and frequency were increased with higher liquid and gas flow rate. It was found that the measured bubble lengths were in good agreement with the empirical models in the previous literature, but the slug lengths were not.
사각 마이크로 채널 내 Taylor 유동 특성 예측에 대한 연구
이준경(Jun Kyoung Lee),이관근(Kwan Geun Lee) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.7
본 논문에서는 600 × 600 μm 사각 마이크로 채널에서의 기-액체 테일러(슬러그) 흐름의 특성을 실험을 통해 살펴보았다. 실험 유체로는 질소와 물을 사용하였으며, 액체 및 기체 겉보기 속도는 각각 0.01 ~ 3 m/s, 0.1 ~ 3 m/s 의 범위에서 테일러 흐름이 나타나는 구간에서만 데이터를 얻었다. 기포 길이, 액체 슬러그 길이, 기포 속도 그리고 기포 생성 주파수를 고속 카메라를 사용하여 이미지 분석을 통해 측정하였다. 제시된 측정값(기포 길이, 액체 슬러그 길이, 기포 속도)과 이전 문헌에서 제안된 경험적 모델의 비교결과 대부분 오차가 50% 이상으로 나타났다. 따라서 기포와 액체 슬러그 길이 그리고 기포 속도에 대한 개선된 모델을 제시하였고, ± 20% 이내의 비교적 우수한 결과를 볼 수 있었다. 또한 기포 생성 주파수는 기포 길이, 액체슬러그 길이 그리고 기포 속도의 관계를 이용하여 ± 20% 이내에서 예측가능함을 알 수 있었다. The characteristics of a gas-liquid Taylor (slug) flow in a square micro-channel with dimensions of 600 μm × 600 μm are experimentally investigated in this paper. The test fluids were nitrogen and water. The superficial velocities of the liquid and gas were in the ranges of 0.01 - 3 m/s and 0.1 - 3 m/s, respectively. The bubble and liquid slug lengths, bubble velocities, and bubble frequencies for various inlet conditions were measured by analyzing optical images obtained with a high-speed camera. It was found that the measured values (bubble and liquid slug lengths, bubble velocities) were not in good agreement with the values obtained using empirical models presented in the existing literature. Modified models for the bubble and liquid slug lengths and bubble velocity are suggested and shown to be in good agreement (±20) with the measured values. Moreover, the bubble frequency could be predicted well by the relationship between the unit cell length and its velocity.
사각 마이크로 채널 내 Taylor Flow의 기포 및 액체 슬러그 유동 특성에 대한 연구
이준경(Jun Kyoung Lee),이관근(Kwan Geun Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.10
The characteristics of gas-liquid Taylor (Slug) flow in a square micro-channel of 600×600 ㎛ were investigated experimentally in this paper. The test fluids were nitrogen and water. The liquid and gas superficial velocities were 0.01~3 m/s and 0.1~3 m/s, respectively. Bubble and liquid slug length, bubble velocity, and frequency were measured by analyzing optical images using a high speed camera. Bubble length decreased with higher liquid flow rate, which increased dramatically with higher gas flow rate. However, slug length did not vary with changes in inlet liquid conditions. Additionally, bubble velocities and frequencies increased with higher liquid and gas flow rates. It was found that measured bubble lengths were in good agreement with the empirical models in the existing literature, but slug lengths were not.
모바일 Smart 기기용 덮개유리 성형시스템의 온도해석과 실험의 비교에 관한 연구
신환준(Hwan June Shin),이준경(Jun Kyoung Lee),방영준(Young Jun Bang),이관근(Kwan Geun Lee),정동연(Dong Yean Jung),이연형(Yean Hyeong Lee),박재현(Jae Hyun Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Nowadays flat shaped cover glass was widely used for mobile devices. But for good design and convenience, curved cover glass is demanded. Thus many companies try to produce curved cover glasses by shaving technique, but the production efficiency is very low. Therefore, the molding technique has been adopted to increase the efficiency for curved glass production system. For a glass molding system, the uniform temperature distribution of the mold must be needed to produce high quality curved cover glass. Before suggesting heating conditions of the molding system for uniform temperature distribution by the thermal analysis, the verification should be required. Therefore, in this study, the temperature measurements were performed for the prototype molding system and the experimental results were compared with the computations. The temperatures on the heating block surface were in good agreement with the computational results for transient and steady conditions.