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Author: search.filters.author.Naosungnoen, Jiranan

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    Airflow and Temperature Simulation in a Big Cleanroom to Reduce Contamination in an HDD Manufacturing Factory
    (2018-06-04)
    Naosungnoen, Jiranan
    ;
    Thongsri, Jatuporn
    Contamination is an important factor that must be well controlled at a stringent level of cleanliness. If it exceeds factory's specifications it shall contribute to poor quality products and product loss in the hard disk drive (HDD) manufacturing factory. This research used a CFD software, FLUENT to simulate the airflow pattern and temperature distribution in a big clean room to find the cause(s) of high contamination. The results of simulation revealed that there are areas in the production with vortex flow which caused high contamination similar to the actual measurement in that clean room. High air velocity that came out of the ULPA Filter at the ceiling above collided at the front of one Return grill nearby. It also caused high velocity vortex and high contamination in that area. To reduce the contamination, we closed one of the Return Grilled near that problematic area which could help reduce the vortex flow and the airflow pattern to be smoother than the previous clean room. Also, the contamination result showed a significant reduction in particle count. The temperature distribution after improvement action taken was unaffected and remained under the control. This research can help enhance a product quality and improve an efficacy of HDD manufacturing process
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    Simulation of airflow in a cleanroom to solve contamination problem in an HDD production line
    (2018-01-01)
    Naosungnoen, Jiranan
    ;
    Thongsri, Jatuporn
    Contamination that exceeds the specification is one of many causes that contributed to a poor quality product in HDD cleanroom manufacturing process. The purpose of this research was to utilize CFD simulation to study the airflow in a clean room to find out the cause(s) of high contamination and to propose a remedy. The results of the simulation show that some areas in the production line had vortex flow and collected a large number of particles which were similar to the results of actual measurement in that clean room. A particular area, which was a long rectangular area near the middle of the clean room, stretching from one side of the room to the other, showed high particle concentration compared to other areas. To solve this problem, we closed one of the ULPA filters which was an inlet of that area. Subsequent simulation showed that there was less vortex flow and a significant reduction of particle concentration. Our method proved to be able to improve contamination control in a manufacturing clean room.