Numerical Investigation on the Performance of Suction Head in a Cleaning Process of Hard Disk Drive Factory

Khongsin, Jirawat; Thongsri, Jatuporn

doi:10.37936/ecti-eec.2020181.218580

Cited by 4 publications

(11 citation statements)

References 12 publications

(16 reference statements)

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“…The proposed SHs were investigated for their cleaning performance in two usage situations: in space and 5 mm above the work area. The 5 mm is the optimal distance for cleaning mentioned in [11,12]. This section describes the detail step-by-step from the start until the suitable SH shape was obtained.…”

Section: Methodsmentioning

confidence: 99%

“…From the calculation based on the actual conditions at the factory, we found that the Reynolds numbers (Re) were between 5 × 10 3 -2 × 10 5 , which matched the SST k-ω turbulence model. The SST k-ω equations can be written as [6][7][8]12,25,27]:…”

Section: Sst K-ωmentioning

confidence: 99%

“…On the other hand, when the air velocity is higher than the suspension velocity, the particles would be sucked into the SH. Assuming that the particles are solid spheres with a constant density and tiny size, and do not change the air direction, the suspension velocity is given in [12]. The v s is used as a threshold for performance quantification.…”

Section: Sst K-ωmentioning

confidence: 99%

“…The actual SH of the factory was a bowl type with a handle that could be adjusted direction for convenience in operation and had a splay angle of 30 • as shown in Figure 2a. Therefore, this research proposed new models with angles of 15 • , 45 • , 60 • , 75 • , and 90 •, including the previous models with 0 • and 30 • in [12] as candidates for the suitable SH shape. Figure 2b shows an example of a splay angle of 60 • as a fluid model created for simulation.…”

Section: A Suction Headmentioning

confidence: 99%

“…First, the key is to change the airflow, air change rate, the layout of the machine installation, etc., of the cleanroom [2][3][4] and wear the proper uniform of operators [5]. For the latter, the solution can be obtained by changing the conditions of the air circulation system, especially in the machines [6], installing the fan filter unit [7], modifying the hood's shape [8,9], and adding the cleaning process [10][11][12]. In brief, the global and local exhaust ventilations consist of three main components: suction head or hood, duct, and vacuum pump.…”

Section: Introductionmentioning

confidence: 99%

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A Suitable Shape of the Suction Head for a Cleaning Process in a Factory Developed by Computational Fluid Dynamics

2021

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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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Section: Methodsmentioning

confidence: 99%

Section: Sst K-ωmentioning

confidence: 99%

Section: Sst K-ωmentioning

confidence: 99%

Section: A Suction Headmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Suitable Shape of the Suction Head for a Cleaning Process in a Factory Developed by Computational Fluid Dynamics

2021

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Gas Flow and Ablation of 122 mm Supersonic Rocket Nozzle Investigated by Conjugate Heat Transfer Analysis

Thongsri

Srathonghuam

Boonpan³

2022

Processes

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The propellant gas flow of a supersonic rocket in inappropriate operating conditions can cause excessive ablation inside a nozzle. In this research, conjugate heat transfer analysis (CHTA), consisting of computational fluid dynamics (CFD) and finite element analysis (FEA), was applied to investigate the gas flow and ablation of a 122 mm nozzle as a case study in the transient state, based on actual operating conditions. First, the nozzle was tested in a static experiment. Then, the experimental results were employed for CHTA settings and validation. Next, after completing the CFD calculation, the results revealed that the nozzle’s gas flow, temperature, pressure, Mach number, shock, etc. were consistent with theoretical results. Finally, using the CFD results as loads, the FEA results showed the equivalent von Mises stress (sv), which was consistent with the ablation results from the experiment, as expected. The more the sv, the greater the ablation. Both sv and ablation were high near the throat and decreased further away. In addition, increasing the insulators’ thickness reduced sv, leading to ablation reduction. The research findings contribute to an understanding of ablation and the methodology of employing CHTA to improve the design of 122 mm and other nozzles with reduced ablation for higher efficacy.

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A Development of Welding Tips for the Reflow Soldering Process Based on Multiphysics

Thongsri

Jansaengsuk

2022

Processes

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A reflow soldering process (RSP) is generally implemented in advanced manufacturing factories for welding small electronic components together to create a product using heat generated at the welding tip (WT). Improper WT design and operating conditions may lead to defects in some products; therefore, optimizing both is immensely significant in developing the RSP. Accordingly, this article proposes a successful RSP development based on multiphysics in a hard disk drive factory consisting of transient thermal-electric and structural simulations. First, a new shape series WT was designed, and a conventional shape, parallel WT, was considered as a case study. Then, they were assembled and experimented with the RSP actual operating conditions to collect essential data. Next, the heat transfer was determined using a transient thermal-electric simulation (TES). The simulation results showed uneven WT temperatures depending on applied voltages, time, and shapes, which were consistent with the experimental results. The higher the applied voltage, the greater the temperature generated at the WT. Finally, after using TES results as loads, the structural simulation showed WT total deformations, which could be consistent with actually occurring defects. The findings from this research are a new design of series WT and proper multiphysics methodology for developing the RSP.

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Numerical Investigation on the Performance of Suction Head in a Cleaning Process of Hard Disk Drive Factory

Cited by 4 publications

References 12 publications

A Suitable Shape of the Suction Head for a Cleaning Process in a Factory Developed by Computational Fluid Dynamics

A Suitable Shape of the Suction Head for a Cleaning Process in a Factory Developed by Computational Fluid Dynamics

Gas Flow and Ablation of 122 mm Supersonic Rocket Nozzle Investigated by Conjugate Heat Transfer Analysis

A Development of Welding Tips for the Reflow Soldering Process Based on Multiphysics

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