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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.
헤더-채널 분기관의 각도변화가 2상유동 분배에 미치는 영향에 대한 기초 연구
신환준(Hwan June Shin),이준경(Jun Kyoung Lee),이관근(Kwan Geun Lee),방영준(Young Jun Bang),윤창식(Chang Sik Yoon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The main objective of this work is to experimentally investigate the effect of angle variation on the distribution of two-phase flow at header-channel junctions. The cross-section of the header and the channels were fixed to 16mm×16mm and 12mm×1.8mm, respectively. Air and water were used as the test fluids. Three different header-channel positions were tested:Vertical header with Horizontal channels(case VM-HC), Horizontal header with Horizontal channels(case HM-HC), and Horizontal header with Vertical Downward channels(case HM-VDC), respectively. In all cases, for the liquid flow distribution, it tended to decrease gradually in the header upstream region. But in the downstream region, different trends can be seen. For the VM-HC case, liquid flow distribution increased and decreased again, for the HM-HC case, it increased sharply near the end of the header plate. And for the HM-VDC case, it decreased continuously. For the gas flow distribution, it has opposite tendency compared to the liquid distribution.
Mobile Smart Device Cover Glass 성형기기의 가열시스템 열해석에 관한 연구
신환준(Hwan June Shin),이준경(Jun Kyoung Lee) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.4
Currently, flat cover glasses are widely applied to mobile devices. However, for a good design and for convenience of use, curved cover glasses are in demand. Thus, many companies are attempting to produce curved cover glasses using a shaving technique, but the production efficiency is very low. Therefore, a molding technique has been adopted to increase the efficiency of curved glass production systems. For a glass molding system, a uniform temperature distribution of the mold is crucial to produce high-quality curved cover glasses. Before setting the heating conditions of the molding system for a uniform temperature distribution by a thermal analysis, verification is required. Therefore, in this study, temperature measurements were conducted for a prototype molding system and experimental results were compared with simulation computations. The temperatures of the heating block surface were in good agreement with the computational results for transient and steady conditions.
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.