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Author: search.filters.author.Thongsri, JatupornSubject: search.filters.subject.Computational Fluid Dynamics

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    Item type:Publication,
    Evaluation and improvement of ventilation systemreduceinside low-costparticle contaminationautomation line to
    (2020-02-28)
    Puangburee, Lamai
    ;
    Busayaporn, Wutthikrai
    ;
    Kaewbumrung, Mongkol
    ;
    Thongsri, Jatuporn
    A Low-Cost Automation (LCA) line, a group of machines to manufacture hard disk drive’s components located inside a clean room of factory, faces the problem of particle contamination caused by an improper ventilation system. To solve this problem, Computational Fluid Dynamics (CFD) has been implemented to evaluate airflow and simulate solutions to improve the ventilation system of the LCA. By using actual operating conditions collected at the factory and Fluent CFD software, the simulation showed that airflow patterns in such areas were substandard. For example, the large areas of recirculation zone with air velocities lower than 0.2 m/s such as Fan Filter Units’ conveyor and Work Area. The low ve-locity of the airflow can cause particle contamination and leads to low-quality production. To reduce the particle contamination, we suggested novel solutions based on the CFD results by increasing the momen-tum source (S<inf>m</inf>) and/or redesigning the LCA’s model especially extending its height of cover. The increasing of S<inf>m</inf> can be simply implemented by increasing the air-condition power to the optimal values accord-ing to the calculation leading to a reduction in recir-culation areas. In addition, extending the height of the LCA’s cover also improved the air velocities in the critical areas to meet the factory’s standard.
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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.