Thongsri, Jatuporn

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

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    A Proper Lubricant for a Swage Process in a Hard Disk Drive Factory Determined by Explicit Dynamics Analysis
    (2023-01-01)
    Bubpatha, Watchara
    ;
    Pattanapichai, Sorathorn
    ;
    Thongsri, Jatuporn
    Since the hard disk drive industries continue to be highly competitive, many factories aim to reduce waste costs by developing their manufacturing process. This article presents the swage process (SP) development to join components: the head gimbal assembly with an actuator arm by explicit dynamics analysis (EDA). First, EDA was employed to determine the total deformation (δ) and equivalent (von Mises) stress (σ) after joining both components in the SP using a traditional lubricant currently used in the factory calculated by the friction coefficients. Then, the EDA results for the traditional lubricant were compared with the experimental results, and an agreement between both results was observed, confirming the EDA's credibility. Next, two additional different lubricants, including a non-lubricant as a control case, were investigated using the EDA. Finally, after comparing the EDA results for all four lubricants, the EDA results showed the proper type of lubricant, which can reduce the δ by 16.40% and σ by 9.40% compared to the traditional lubricant. Accordingly, the research findings were applied as important information for determining the best lubricant for other HDD generations to suit the SP, which can reduce waste costs from the trial and error method.
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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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    The Development of a High-Efficiency Small Induction Furnace for a Glass Souvenir Production Process Using Multiphysics
    (2024-09-01)
    Thongsri, Jatuporn
    ;
    Poopanya, Piyawong
    ;
    Sriphalang, Sanguansak
    ;
    Pattanapichai, Sorathorn
    A small induction furnace (SIF), which has the important components of copper coils, a ceramic jig, and a graphite crucible, employed for a glass souvenir production process, has been developed as a form of clean technology for multiphysics, consisting of electromagnetics analysis (EA) and thermal analysis (TA). First, two experiments were established to measure parameters for multiphysics results validation and boundary condition settings. Then, the parameters were applied to multiphysics, in which the EA revealed magnetic flux density (B) and ohmic losses, and the TA reported a temperature consistent with the experimental results, confirming the multiphysics credibility. Next, a ferrite flux concentrator was added to the SIF during development. Multiphysics revealed that PC40 ferrite, as a flux concentrator with a suitable design, could increase B by about 159% compared to the conventional SIF at the power of 1000 W. As expected, the B increases alongside the increase in power applied to the coils, and is more densely concentrated in the flux concentrator than in other regions, enhancing the production process efficacy. Lastly, the developed SIF was employed in the actual process and received good feedback from users. The novel research findings are the developed SIF and methodology, exclusively designed for this research and practically employed for a glass souvenir production process.
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    A Feasibility Study for the Hot-Air-Assisted Reflow Soldering Process Based on Computational Fluid Dynamics
    (2024-10-01)
    Kanjad, Natcha
    ;
    Chanbandit, Chanapat
    ;
    Thongsri, Jatuporn
    In hard disk drive (HDD) manufacturing, a reflow soldering process (RSP) employs heat generated at the welding tip (WT) to bond tiny electrical components for assembling an HDD. Generally, the heat was generated by an electric current applied to the WT. This article reports a feasibility study of using hot air based on computational fluid dynamics (CFD), a choice to assist heat generation. First, the WT and hot air tube (HAT) prototypes were designed and created. The HAT is a device that helps to supply hot air directly to generate heat at the WT. Then, the experiment was established to measure the temperature (T) supplied by the hot air. The measure results were employed to validate the CFD results. Next, the prototype HAT was used to investigate the T generated at the WT by CFD. The comparison revealed that the T measured by the experiment was in the 106.2 °C–133.5 °C range and that the CFD was in the 107.3 °C–136.6 °C range. The maximum error of the CFD results is 2.3% compared to the experimental results, confirming the credibility of the CFD results and methodology. The CFD results revealed that the operating conditions, such as WT, HAT designs, hot air inlet velocity, and inlet temperature, influence the T. Last, examples of suitable operating conditions for using hot air were presented, which confirmed that hot air is a proper choice for a low-temperature RPS.
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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
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    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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    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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    The Effect of a Child Model on Breath-Sounds Examination Skills and Satisfaction on Nursing Students
    (2022-07-01)
    Thamruangrit, Silpthai
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    Santati, Sermsri
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    Granger, Jumpee
    ;
    Buadong, Dongruethai
    ;
    Thongsri, Jatuporn
    One of nursing students’ auscultation critical skills is listening to a child’s breathing sounds. Previously, learning this skill required a SimBaby, which was insufficient, causing nursing students to lack proficiency. Therefore, a CHIld Model (CHIM), an innovation emulating breathing sounds, has been invented based on Gagné’s learning theory to solve this insufficiency. This article reports on the CHIM invention, consisting of hardware, software, and programming, and its effect on nursing students’ breath-sounds examination skills and satisfaction. First, the CHIM was assessed for quality and satisfaction by experts. The results were good in quality and had the highest satisfaction for application in actual use. Second, the CHIM was assessed for auscultation skills and satisfaction among nursing students. Forty-four junior nursing students participated. Next, they were randomly divided into experimental and control groups. Then, both were taught the same about respiratory problems with the SimBaby, except the experimental group had training with the CHIM. After that, both groups’ auscultation skills and satisfaction in the experimental group were examined. Finally, the statistical analysis showed that after the intervention was applied, learning with the CHIM was better than without, with the highest satisfaction level. As intended, the CHIM can help effectively enhance students’ learning and proficiency.
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    Effect of Nozzle Pressure and Shape Ratios on Gas Flow of a 122 mm Supersonic Rocket Nozzle investigated by CFD
    (2023-01-01)
    Chaiaiad, Chatchapat
    ;
    Thongsri, Jatuporn
    This article reports the effect of nozzle pressure ratio (NPR) and shape ratio (SR) on the gas flow of a 122 mm supersonic rocket, a convergent-divergent nozzle, using computational fluid dynamics (CFD). The NPR is the ratio between the pressure inlet and outlet, while the SR is the ratio between the outlet and throat areas of the nozzle. The CFD results revealed the gas flow, pressure (P), Mach number (M), temperature (T), shock, and jet for some conditions of NPR and SR, consistent with the theory. Furthermore, it was found that M increased with increasing NPR and/or SR. Furthermore, T enhanced with increasing NPR but decreased with increasing SR. This report can be used to further development of this nozzle type suitable for missions.
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    CFD—Assisted Expert System for N2-Controlled Atmosphere Process of Rice Storage Silos
    (2024-03-01)
    Angsrisuraporn, Phakkawat
    ;
    Samakkarn, Chawit
    ;
    Lekawat, Lertsak
    ;
    Singkhornart, Sasathorn
    ;
    Thongsri, Jatuporn
    Since organic rice storage silos were faced with an insect problem, an owner solved this problem using the expert system (ES) in the controlled atmosphere process (CAP) under the required standard, fumigating insects with an N<inf>2</inf>, reducing O<inf>2</inf> concentration to less than 2% for 21 days. This article presents the computational fluid dynamics (CFD) assisted ES successfully solved this problem. First, CFD was employed to determine the gas flow pattern, O<inf>2</inf> concentration, proper operating conditions, and a correction factor (K) of silos. As expected, CFD results were consistent with the experimental results and theory, assuring the CFD’s credibility. Significantly, CFD results revealed that the ES controlled N<inf>2</inf> distribution throughout the silos and effectively reduced O<inf>2</inf> concentration to meet the requirement. Next, the ES was developed based on the inference engine assisted by CFD results and the sweep-through purging principle, and it was implemented in the CAP. Last, the experiments evaluated CAP’s efficacy in controlling O<inf>2</inf> concentration and insect extermination in the actual silos. The experimental results and owner’s feedback confirmed the excellent efficacy of ES implementation; therefore, the CAP is effective and practical. The novel aspect of this research is a CFD methodology to create the inference engine and the ES.