Thongsri, Jatuporn

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Thongsri, Jatuporn
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Thongsri, J.
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jatuporn.th@kmitl.ac.th

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    Coupled Electromagnetic-Thermal Multiphysics Analysis and Design Optimization of a Microwave Kiln
    (2026-05-01)
    Samakkarn, Chawit
    ;
    Poopanya, Piyawong
    ;
    Thongsri, Jatuporn
    This study presents a multiphysics investigation of a microwave kiln for the glass-casting process, focusing on the coupled interaction between electromagnetic heating and thermal responses. The kiln (SiC-based) was experimentally tested in a household 800 W, 2450 MHz microwave oven without rotation for 5 min, with temperatures recorded at key positions using thermocouples and verified by thermal imaging. The computational framework integrates ANSYS (2021R1) High-Frequency Structure Simulator (HFSS) for electromagnetic-field and heat-generation prediction with Transient Thermal Analysis (TTA) for time-dependent temperature distribution. Validation showed agreement between simulation and experiment of the final temperature, with most errors below 4%, confirming the model’s reliability. A parametric study revealed that a thin SiC susceptor layer (1.5–2.0 mm) improves heat generation and temperature uniformity, while excessive thickness reduces heating efficiency. The optimized design improved the temperature by 2.58% compared with the original configuration at 800 W and achieved up to 38.44% improvement under specific operating conditions. These findings demonstrate that the proposed multiphysics method can support future development of small-scale glass-casting systems and sustainable recycled-glass production. Consequently, the work paves the way to Sustainable Development Goals (SDGs).
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    Effect of Detergent, Temperature, and Solution Flow Rate on Ultrasonic Cleaning: A Case Study in the Jewelry Manufacturing Process
    (2025-12-01)
    Juangjai, Natthakarn
    ;
    Chaiaiad, Chatchapat
    ;
    Thongsri, Jatuporn
    This research investigated how detergent type and concentration, solution temperature, and flow rate affect ultrasonic cleaning efficiency in jewelry manufacturing. A silver bracelet without gemstones served as the test sample, and the study combined harmonic response analysis to assess acoustic pressure distribution with computational fluid dynamics to examine fluid flow patterns inside an ultrasonic cleaning machine. Cleaning tests were performed under real factory conditions to verify the simulations. Results showed that cleaning efficiency depends on the combined chemical and ultrasonic effects. Adding detergent lowered surface tension, encouraging cavitation bubble formation; higher temperatures (up to 60 °C) softened dirt, making removal easier; and moderate solution flow improved the cleaning, helping to carry dirt away from jewelry surfaces. Too much flow, however, decreased cavitation activity. The highest cleaning efficiency (93.890%) was achieved with 3% U-type detergent at 60 °C and a flow rate of 5 L/min, while pure water at room temperature (30 °C) without flow had the lowest efficiency (0.815%), confirmed by weighing and scanning electron microscope measurements. Interestingly, maximum ultrasonic power concentration did not always match the highest cleaning efficiency. The study supports sustainable practices by limiting detergent use to 3%, in line with Sustainable Development Goal (SDG) 9 (Industry, Innovation, and Infrastructure).
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    Successful simulation of airflow in the microenvironment of an assembly automation machine and its implication
    (2014-01-01)
    Thongsri, Jatuporn
    ;
    Khaokom, Adisorn
    Today, the hard disk drive (HDD) industry is using assembly automation machine (AAM) to construct head stack assembly (HSA) from smaller parts. AAM needs to operate in a clean environment with very low particle counts. To achieve this end, fan filter Unit (FFU) is used to supply purified air into the environment by filtering out airborne particles from recirculating air. In this study, we investigated numerically the airflow induced by FFUs inside a microenvironment that houses an AAM in an HDD factory. The boundary conditions chosen for simulation were directly derived from the real ambient conditions in this HDD factory. We found that the FFUs not only filter out airborne particles from the air supplied into the microenvironment but also act as a particle blocker, pushing away the nearby particles in the air surrounding the openings of the microenvironment. The findings from this study can be applied to cases where other kinds of machinery need to be protected from airborne particles. © (2014) Trans Tech Publications, Switzerland.
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    Harmonic Response Analysis of Tank Design Effect on Ultrasonic Cleaning Process
    (2022-03-01)
    Phophayu, Suchada
    ;
    Kliangklom, Ketmanee
    ;
    Thongsri, Jatuporn
    Several ultrasonic cleaning tanks (UCTs) had a problem: a manufacturer complained that there were damages to cleaning objects, they were unclarified, and it needed to be abruptly solved. To investigate and solve the problem, a small UCT filled with 3.92 L of water, with a frequency of 28 kHz, two horn transducers, and a total power of 100 W was built for simulation and experiment. A built tank body material of UCT can be adjustable to acrylic, glass, and stainless steel. Since the cavitation causing the cleaning relates to acoustic pressure, harmonic response analysis (HRA) in ANSYS software was employed to calculate the acoustic pressure inside the UCT for different designs such as mentioned materials, power, thickness, volume, and frequency. The HRA results revealed uneven acoustic pressure depending on the tank designs, consistent with foil corrosion and power concentration experiments. Furthermore, using the tank body material with acrylic, glass, and stainless steel provided the highest, moderate, and lowest acoustic pressure levels, respectively. The uneven acoustic pressure resulted from the differences in material transmission coefficients. In addition, the damage occurred because of improper tank design, resulting in excessive acoustic pressure. Therefore, the tank design is indispensable in designing high-efficiency UCTs to reduce damage and meet customer requirements.
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    Transient Thermal-Electric Analysis of Peltier Cooling Plate for Developing a Mini Refrigerator
    (2024-01-01)
    Chaiaiad, Chatchapat
    ;
    Thongsri, Jatuporn
    This article reports a transient thermal-electric analysis (TEA), a simulation of a Peltier cooling plate (PCP) aimed to develop into a mini refrigerator soon. This conventional PCP includes 110 Peltier cells, which are a series of connecting cells, and two sandwiched ceramic plates. First, the experiment measured the PCP's applied current (I) and temperature (T) under the desired conditions. Then, the TEA was employed to determine the I and T of the PCP, which were compared with the experimental results. As expected, the comparison shows the consistency between the simulation and experimental results, validating the credibility of the methodology and simulation results. The simulation results revealed that the temperature difference (Δ T) between the two sandwiched ceramic plates increased with the increase of I and the number of cells, as expected. Last, the proposed model of PCP, I of 500 mA, 126 Peltier cells, and reducing the gap between cells, could generate T of -2.3761C on the cool ceramic plate lower than the conventional model of -1.6495 C, about 44% reduction at the same I, suitable for developing the mini refrigerator. The novel of this article is the practical methodology of using transient TEA to help design the PCP for specific purposes.
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    Effect of grain size on ferroelectric films using effective medium theory
    (2014-01-01)
    Thongsri, J.
    Based on effective medium theory, the temperature dependence of effective dielectric permittivity, ε<inf>e</inf>(T), on the core radius (a) and thickness (t) of nonferroelectric dead layer (DL) on the surface of inhomogeneous grains of ferroelectric film made up of cylindrical ferroelectric grains was theoretically investigated. It was found that ε<inf>e</inf>(T) increases with increasing core radius and decreases with increasing DL thickness. In this study, an equation expressing the relationship among ε<inf>e</inf>, a and t was derived. This equation is useful for preparing ferroelectric film to desired properties.
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    A Problem of Particulate Contamination in an Automated Assembly Machine Successfully Solved by CFD and Simple Experiments
    (2017-01-01)
    Thongsri, Jatuporn
    Assembly of hard disk drives (HDDs) needs to be done in an automated assembly machine (AAM) virtually free of particulate contamination that can cause them to malfunction. Fan filter units (FFUs) are installed above the AAM to reduce the number of suspended particles in the recirculating air flowing over and around them. At one time, several HDDs were found to be defective. To find out the root cause of this problem, computational fluid dynamics (CFD) was used to investigate the airflow over and around the AAM. It was found that the cause of the high particle counts was improper air speed from the FFUs. The optimal FFUs air speed needed to be in the range of 0.35-0.65 m/s in which the airflow would block out nearby airborne particles and purge away particles generated by the AAM effectively which would, in effect, reduce the particle counts down below the threshold level of class 100 clean room. A few available measurement tools at the factory were then used to perform validating measurements against the simulation results, and the validation was positive. This optimal speed range was implemented at the factory after which the level of contamination was reduced to an acceptable level.
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    Effect of grain size on effective permittivity of ferroelectric films based on effective medium theory
    (2014-01-01)
    Thongsri, Jatuporn
    Based on effective medium theory, the temperature dependence of effective dielectric permittivity, ε<inf>e</inf>(T), on core radius (a) and thickness (t) of non-ferroelectric dead layer (DL) on the surface of inhomogeneous grains of ferroelectric film made up of cylindrical ferroelectric grains was theoretically investigated. It was found that ε<inf>e</inf>(T) increases with increasing core radius but decreases with increasing DL thickness. In this work, an equation expressing the relationship among εe, a and t was derived. This equation is very useful for the preparation of a ferroelectric film to desired properties. © (2014) Trans Tech Publications, Switzerland.
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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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    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