Thongsri, Jatuporn

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

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    A simulation of the number of particles trapped by the circulating filter of a hard disk drive and their trajectories
    (2014-01-01)
    Thongsri, Jatuporn
    ;
    Pongkom, Vana
    A transition shear stress transport turbulence model and a discrete phase model of Fluent software were employed to simulate numerically the trajectories of loose particles and the number of them trapped by the circulating filter of a hard disk drive (HDD). The filter was located either at the left or the right of a 2.5 inch dual platter HDD rotating at 7200 rpm. Particles were released from the middle diameter position where four head gimbal assemblies (HGAs) were located. The simulation included airflow and particle trajectories released from any of the four HGAs. The results of this simulation can help determine the efficiency of a circulating filter and its optimal placement. © (2014) Trans Tech Publications, Switzerland.
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    Development of an industrial ultrasonic cleaning tank based on harmonic response analysis
    (2019-01-01)
    Tangsopa, Worapol
    ;
    Thongsri, Jatuporn
    A small industrial ultrasonic cleaning tank, which is one of the best-selling models, had cleaning problems. Customers sometimes complained that the tank did not completely clean all objects, or that some objects got damaged, so a solution to the problem was urgently needed. The tank has a volume of 18 L, frequency of 28 kHz, eight horn style PZT4 transducers, and a total electric power of 400 W. The cleaning occurs from the cavitation effect which corresponds to an increase in the acoustic pressure. A computer simulation is presented using a harmonic response analysis (HRA) in ANSYS to resolve and improve the efficacy of the tank. From the simulation, we found that the acoustic pressure within the tank was uneven. The distribution of acoustic pressure had a characteristic pattern depending on the placement of the transducers. When the temperature was increased, the acoustic pressure was decreased leading to a cleaning efficacy drop as well. All simulation results were correlated to the foil corrosion test and power concentration experiment. The HRA was used to redesign the tank for higher cleaning efficacy. The simulation results indicated that more suitable placement of the transducers lead to a more intensified acoustic pressure, and a better distribution throughout the tank. This research not only resolved the cleaning problems that occurred in the 28 kHz tank, but was also demonstrated that it can be applied to a 40 kHz tank as well. Results from this research were accepted and approved by the manufacturer, and were used by them to develop smarter industrial ultrasonic tanks with higher cleaning efficacy for commercial sale.
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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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    Feasibility Study for Installing Machine in Production Line to Avoid Particle Contamination Based on CFD Simulation
    (2017-11-01)
    Khaokom, Adisorn
    ;
    Thongsri, Jatuporn
    Ventilation system inside production line for electronic component production needs to meet the factory standard. Because it can eliminate small particles which may cause of human or machine in production as well as it can distribute the circulating air temperature uniformly. CFD is used in this research in order to study the feasibility and plan for machine layout in production line before actual installation. The simulation shows the airflow in every area inside production line. From simulation with releasing the particles from human and machine is found that this ventilation system generates airflow that makes most particles float out of the machines and no particle downs to the conveyor, it results to contamination. In addition, the simulation also shows the range of 19-26 °C air temperature that meets the factory standard. The results of this research are the parts of the data to renovate the production line to get more efficiency and proper on the production.
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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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    Optimum airflow to reduce particle contamination inside welding automation machine of hard disk drive production line
    (2015-03-01)
    Thongsri, Jatuporn
    ;
    Pimsarn, Monsak
    Welding automation machine (WAM), used for welding minute components to the head gimbal assembly (HGA) of a hard disk drive (HDD), needs to operate in a strictly clean environment. In today’s HDD factories, to prevent airborne particle contamination to the WAM, Fan Filter Units (FFUs) are installed on top of it to supply clean air and blow away outside airborne micro particles, keeping the microenvironment clean. Furthermore, the mass of the clean air should also carry away harmful particles generated inside the microenvironment. In this research, numerical simulation of airflow inside a WAM was performed in order to verify these cleaning functions of the airflow. A transition shear stress transport turbulence model was employed to simulate airflow from the FFUs through and out of the microenvironment. The simulation results showed that the airflow from the FFUs truly performs the two cleaning functions as intended. Moreover, they also revealed that the optimum air speed, the speed resulting in the lowest particle counts, is in the range of 0.35–0.55 m/s. Our findings can be useful for developers who may use FFUs to reduce particle counts in the environment of other types of industrial machinery.
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    A suitable shape of the suction head for a cleaning process in a factory developed by computational fluid dynamics
    (2021-11-01)
    Thongsri, Jatuporn
    ;
    Tangsopa, Worapol
    ;
    Khongsin, Jirawat
    The previous shape of the suction head (SH) employed in a cleaning process in a factory had a low performance, removed fewer particles, and generated an annoying noise. Therefore, new shapes of SH have been proposed to solve the issues and the cleaning performance was investigated by the Shear Stress Transport (SST) k-ω turbulence, Discrete Phase (DP), Large Eddy Simulation (LES), and Ffowcs Williams and Hawkings (FW–H) models in a transient state of computational fluid dynamics (CFD). The SST k-ω and DP models were applied to determine the airflow, suspension velocity, cleaning region, and particle trace. In addition, the LES and FW–H models were used to evaluate the noise, sound pressure level, and frequency generated from the proposed shapes. All simulation results were validated with the air velocity and noise measurements and were analyzed to find a suitable shape. The simulation and experimental results revealed that the shapes of the SH affected the cleaning performance and noise generation. The higher the air velocity, the higher the noise generation. The suitable shape delivered a 4.37% better particle removing performance and 11.1 dB less noise generation than the previous shape. The outcomes of this research are the suitable shape of the SH and the research methodology which enabled the application of both CFD and experiments to solve the issue to help enhance the efficiency of the cleaning process in an actual factory.
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    Improved Design of Ultrasonic Cleaning Tank Using Harmonic Response Analysis in ANSYS
    (2018-06-14)
    Tangsopa, W.
    ;
    Keawklan, T.
    ;
    Kesngam, K.
    ;
    Ngaochai, S.
    ;
    Thongsri, J.
    Ultrasonic cleaning tank is a machine that many factories widely used to clean objects. At one factory, a problem occurred in the cleaning process, resulting in the factory not being able to clean objects, but cracks also appeared on some objects. It was anticipated that these were caused by uneven acoustics pressure distribution which resulted in unsuitable cavitation. This directly affected cleaning performance within the tank. In order to improve the tank's efficacy, in this research, we used Harmonic Response Analysis in ANSYS 17.2 to simulate the occurrence of acoustic pressure in the tank to find a suitable type and placing position of the transducer for the tank. We found that transducers made from PZT4 gives greater acoustic pressure than those made from PZT8. Changing the transducer type does not affect the acoustic pressure pattern. PZT4 is therefore the most suitable type of transducer for this tank. Simulation results also suggested that placing the transducer under and beside the tank will result in intense acoustic pressure that is evenly dispersed throughout the tank. Results from this simulation were then passed to the manufacturing factory, and were later accepted that it could truly enhance the tank's efficacy. Information regarding the issue was also used in the development of improved design of ultrasonic cleaning tank to have greater performance levels.
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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.