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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.
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    A CFD investigation of airflow in a hard disk drive production line to detect the cause(s) of contamination and its mitigation
    (2017-07-02)
    Khaokom, Adisorn
    ;
    Thongsri, Jatuporn
    ;
    Kaewkhaw, Polsate
    Contamination exceeds the standards in certain areas within the production line of hard disk drive (HDD) manufacturing, such as in the clean room of a factory. In order to find the cause(s) and solve the problem, we decided to use the computational fluid dynamics (CFD) to simulate the airflow within the production line. The results show the cause of contamination, which is from the exhaust fan installed in the electrical testing machine in the production line of HDD manufacturing, which releases large amounts of particles. To resolve this problem, the CFD results were analyzed to design and create a new cover for the exhaust fan. Once this invention is installed to the electrical testing machine, it can control the airflow to float into other areas that do not affect nor contaminate the product. The factory utilized this research. Other than solving contamination problems that exceed standards, it also saves production costs from purchasing new machines as well.
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    A Successful CFD-Based Solution to a Water Condensation Problem in a Hard Disk Drive Factory
    (2017-01-01)
    Thongsri, Jatuporn
    This paper was intended as an article of a practical solution. The settings of a ventilation system for a production line in a hard disk drive (HDD) factory were inappropriate leading to a condensation problem in a work area causing the finished products to be defective and unsalable. This paper describes an attempt to solve this problem and the outcome. Computational fluid dynamics (CFD) was used to simulate the airflow from a ventilation system in an HDD factory. The simulation results were validated with actual values measured with instruments readily available at the factory. The simulation results showed that the airflow patterns and temperature distribution of the air above and around some areas in the production line were not proper. The old temperature setting of the system for the air coming out of the inlet caused the temperature of the air above the said areas to be in the range of 13-20.5 °C, which was lower than the dew point temperature thus causing a condensation problem. From the results of the simulation, we recommended the factory to increase the inlet air temperature to be around 16.5-22 °C, so that the temperature of the air above and around the work areas would be higher than the dew point temperature and more uniform. The factory implemented our recommendation and found that it not only solved the problem satisfactorily but also saved the air-conditioning cost.