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손일엽,서인수,이상현,Sean Jeong 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
Numerical experiments to improve the deposition uniformity in organic light-emitting diode (OLED) manufacturing process using direct simulation Monte Carlo (DSMC) technique running on general-purpose graphical processing unit (GPGPU) architecture were conducted in this study. Two ways to improve the deposition uniformity are proposed: one is to select a combination of different nozzle cap diameters, thereby controlling the amount and distribution of evaporated organic material, and the other is to investigate the effect of installing two inner plates on the change in the deposition uniformity associated with the transport of organic material within the crucible. For this purpose, some rules must be followed, namely, different diameters of nozzle caps, e.g., 8, 9 and 10 mm, must be used, and eight nozzles at both edges of the nozzle array must have a diameter of 10 mm. DSMC simulations were performed for all cases with new sets of nozzle array by replacing the initially installed 10 mm diameter caps with 8 or 9 mm diameters caps sequentially. From DSMC calculations of the corresponding deposition uniformity values, it was found that 8 mm diameter caps are more effective than 9 mm diameter caps in producing a good quality of deposition on the glass panel, and the final combination of nozzle caps that satisfies the target uniformity value of less than 2% is finally obtained. On removing the inner plate located immediately below the nozzle array, the deposition uniformity became considerably worse, clearly indicating that the control of the evaporated material transport influences the whole quality of the deposition thickness on the glass panel. It is thus verified that the amount of ejected material through nozzles that are located at the center of nozzle array, and the type of inner plate located below the nozzle, must be precisely determined for manufacturing high-quality OLED glass panels. This study specifically presents the process and possibility of a scientific simulation of DSMC dealing with the behavior of rarefied gases to achieve the optimized goal of a high quality of deposition uniformity in the practical manufacturing process.
공개 라이브러리 기반 실내 공조 맞춤형 전산모사 시스템 개발
손일엽(Ilyoup Sohn),노현석(Hyunseok Roh),김재성(Jaesung Kim) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.2
밀폐된 공간내의 공조 문제에 있어서 실내의 기류 및 온도 특성을 전산유체역학기법을 통해 쉽게 예측할 수 있는 맞춤형 시뮬레이터를 개발하였다. 본 시스템에서는 사용자가 직접 해석 대상 평면도를 입력하고 적절한 경계조건을 설정하면 전산유동해석을 위한 계산 격자가 자동으로 생성되고 유한체적법으로 이산화된 공개 전산유체코드를 통해 주어진 공간내의 열유체 해석 결과를 얻게 된다. 초기 실내 평면도면 입력부터 경계조건 설정, 전산유동해석 결과까지 하나의 사용자 인터페이스 상에서 작업할 수 있으며 격자생성과 유동해석 알고리듬은 공개 라이브러리를 사용하여 구현하였다. 간단한 실험 데이터를 통해 해석결과를 검증하였으며 실제 실내 공조에 대한 기류해석을 통해 유동의 경향성을 파악할 수 있는 맞춤형 유동전산모사 시스템을 구성하였다. A customized CFD simulator to perform thermo-fluid dynamic simulations of an HVAC for an indoor space is presented. This simulation system has been developed for engineers studying architectural engineering, as the HVAC mechanical systems used in housings and buildings. Hence, all functions and options are so designed to be suitable that they are suitable for non-CFD experts as well as CFD engineers. A Computational mesh is generated by open-source libraries, FEMM (Finite Element Method Magnetics), and OpenFOAM. Once the boundary conditions are set, the fluid dynamic calculations are performed using the OpenFOAM solver. Numerical results are validated by comparing them with the experimental data for a simple indoor air flow case. In this paper, an entirely new calculation process is introduced, and the flow simulation results for a sample office room are also discussed.