Heat transfer and flow characteristics in the hard disk drive tester

Naphon, Paisarn; Ratchaneekorn, Sittisak; Kurujareon, Jutarat

doi:10.1016/j.icheatmasstransfer.2009.04.012

Cited by 6 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the 1970s, CFD has been widely used to investigate airflow in various types of rooms, facilities, equipment, devices, and environments [4][5][6][7][8][9][10][11][12][13], but it has only been used for a few direct investigations of airflow over and around pieces of industrial machinery. Results from those investigations were very beneficial to our work and some are 2 Mathematical Problems in Engineering mentioned here.…”

Section: Introductionmentioning

confidence: 99%

A Problem of Particulate Contamination in an Automated Assembly Machine Successfully Solved by CFD and Simple Experiments

Thongsri

2017

Mathematical Problems in Engineering

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

A Problem of Particulate Contamination in an Automated Assembly Machine Successfully Solved by CFD and Simple Experiments

Thongsri

2017

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…We thus use the k À e standard turbulence model and TL wall approach to simulate the heat transfer in the HEV geometry. The same numerical procedure and turbulence model were used by Ismail et al [20], Eldrainy et al [21] and Naphon et al [22] and numerical results showed good agreement with experimental ones. The flow in the near-wall region is described by the ''two-layer model", where the Navier-Stokes equations are solved in the viscous sublayer.…”

Section: Governing Equations and Numerical Proceduresmentioning

confidence: 52%

“…The same numerical method and turbulence model were recently used to study the heat transfer in different complex geometries, and it was shown that the numerical results are in good agreement with experimental ones, even in non-isotropic turbulent flows [20][21][22]. Hydrodynamic numerical results for the present flow were validated by laser Doppler velocimetry (LDV) and pressure-drop measurements by Mohand Kaci et al [23].…”

Section: Introductionmentioning

confidence: 82%

Flow structure and heat transfer induced by embedded vorticity

Kaci

Habchi

Lemenand

et al. 2010

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

“…From a literature search, we found that there was no direct computer fluid dynamics (CFD) study of airflow in the microenvironment of an assembly automation machine reported before, but there were several indirect studies such as studies of airflow in a clean room and other facilities [1][2][3][4][5]. Those studies applied the same fluid dynamic principles that are relevant to our work.…”

Section: Introductionmentioning

confidence: 98%

“…Noh et al [2], using a CFD simulation of particle counts, were able to successfully control the contamination inside a clean room. Naphon et al [3] studied the heat transfer and airflow inside an HDD tester. They found that air flowed unevenly there.…”

Section: Introductionmentioning

confidence: 99%

Successful Simulation of Airflow in the Microenvironment of an Assembly Automation Machine and its Implication

Thongsri

Khaokom

2014

AMR

View full text Add to dashboard Cite

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.

show abstract

Heat transfer and flow characteristics in the hard disk drive tester

Cited by 6 publications

References 12 publications

A Problem of Particulate Contamination in an Automated Assembly Machine Successfully Solved by CFD and Simple Experiments

A Problem of Particulate Contamination in an Automated Assembly Machine Successfully Solved by CFD and Simple Experiments

Flow structure and heat transfer induced by embedded vorticity

Successful Simulation of Airflow in the Microenvironment of an Assembly Automation Machine and its Implication

Contact Info

Product

Resources

About