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나선형 마이크로/나노 로봇의 규모와 표면특성이 유영에 미치는 영향에 관한 수치적 연구
신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),김영웅(Young Woong Kim),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study analyzed the swimming characteristics of helical micro/nano robots in the no-slip condition and the slip condition. For the micro/nano scales with Knudsen number greater than 0.01, the Maxwell slip model was applied to analyze the effect of slip on the wall. Micro/nano swimming robot with a large Knudsen number had a large slip effect, which caused the swimming speed to be relatively slow. Meanwhile, the flow characteristics were analyzed considering the effects of hydrophilicity and hydrophobicity on slip. We found that even if the Knudsen number is constant, when the surface effect of the swimming robot is hydrophilic, the propulsion force increases compared to the case of hydrophobicity. The propulsion efficiency also demonstrated the same trend as the swimming speed, and the maximum efficiency was 0.097%, which is the efficiency of the no-slip condition on the wall.
나선형 마이크로/나노 로봇의 규모와 표면특성이 유영에 미치는 영향에 관한 수치적 연구
신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),김영웅(Young Woong Kim),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study analyzed the swimming characteristics of helical micro/nano robots in the no-slip condition and the slip condition. For the micro/nano scales with Knudsen number greater than 0.01, the Maxwell slip model was applied to analyze the effect of slip on the wall. Micro/nano swimming robot with a large Knudsen number had a large slip effect, which caused the swimming speed to be relatively slow. Meanwhile, the flow characteristics were analyzed considering the effects of hydrophilicity and hydrophobicity on slip. We found that even if the Knudsen number is constant, when the surface effect of the swimming robot is hydrophilic, the propulsion force increases compared to the case of hydrophobicity. The propulsion efficiency also demonstrated the same trend as the swimming speed, and the maximum efficiency was 0.097%, which is the efficiency of the no-slip condition on the wall.
이류체 세정공정에서 이물질 포집 장치 개발에 관한 수치적 연구
김영웅(Young Woong Kim),신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The purpose of the research is to develop a device to prevent secondary contamination by particles removed in the cleaning process of small precision plastic lens injection molds. The particle capturing device consists of two-fluid jet injection inlet for cleaning and another inlet of atmospheric air to maintaining the cleaning effect and an outlet for inhale the particles by applying vacuum pressure. The optimal air intake size was 0.12L and the outer shape of the device was proposed to have an inclination of 45°. In addition, a baffle was installed between the injection and the suction port inside the device to maximize the cleaning and capturing effect. The optimal length of the baffle was evaluated by analyzing the flow and particle behavior. The length of the cylindrical shape of the baffle with a constant cross section is suitable for 1.8L, 2.4L, and 3L, and the optimal length for the conical shape of the baffle was evaluated to be 3L.
이류체 세정공정에서 이물질 포집 장치 개발에 관한 수치적 연구
김영웅(Young Woong Kim),신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The purpose of the research is to develop a device to prevent secondary contamination by particles removed in the cleaning process of small precision plastic lens injection molds. The particle capturing device consists of two-fluid jet injection inlet for cleaning and another inlet of atmospheric air to maintaining the cleaning effect and an outlet for inhale the particles by applying vacuum pressure. The optimal air intake size was 0.12L and the outer shape of the device was proposed to have an inclination of 45°. In addition, a baffle was installed between the injection and the suction port inside the device to maximize the cleaning and capturing effect. The optimal length of the baffle was evaluated by analyzing the flow and particle behavior. The length of the cylindrical shape of the baffle with a constant cross section is suitable for 1.8L, 2.4L, and 3L, and the optimal length for the conical shape of the baffle was evaluated to be 3L.
2차 차수 미끄럼모델을 적용한 노즐의 분사구 각도 변화가 유기물의 증착에 미치는 영향에 관한 수치적 연구
차중원(Jung-Won Cha),강정석(Jung-Seok Kang),신규식(Gyu-Sik Shin),한상욱(Sang-Wook Han),양시영(Si-Young Yang),김형민(Hyung-Min Kim) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
A key part of the panel process for manufacturing high-definition displays is the deposition of OLED organic material on to substrates. In the deposition process, a Fine-Metal-Mask(FMM) is located at the front of the substrate for deposition of organic material on the desired base plate. The organic material is deposited on the substrate through a small hole in the FMM. In addition, deposition takes place in the chamber of the high-vacuum state, so that organic material becomes very sparse, so analysis and prediction of deposition require very high refinement and detail. In this study, 2nd order slip models were applied to the walls of the deposition chamber which maintained a very low pressure. According, in order to increase the deposition rate of organic material injected through the surface type nozzle, it was analyzed the change of the velocity at the location of the panel due to the change of the angle of the injection hole in the surface type nozzle.