Steady-state airflow and particle trajectories inside a hard disk drive | |
| Author | Saha, Chanchal |
| Call Number | AIT Thesis no.ISE-10-05 |
| Subject(s) | Trajectories (Mechanics) Hard disks (Computer science) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Industrial and Manufacturing Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ISE-10-05 |
| Abstract | Contaminated particles inside disk drive are a big hazard for the safety of storage data inside it. This thesis initiates an approach to understand the airflow field and contaminated particle trajectories inside disk drive enclosure for a constant 5400 rpm disk rotational speed. In addition, initiatives are taken to find better combinations of recirculation filter physics parameters in order to remove these particles from the disk drive enclosure. In this thesis, the airflow field and contaminated particle trajectories are investigated using commercial simulation software Star-CCM+ and data are analyzed using Minitab and Microsoft excels software. At first, airflow model is developed without filter medium to obtain steady airflow pattern. Next, airflow model with filter medium is generated to observe the airflow characteristics near filter medium. Subsequently, particle trajectories are studied by injecting particles of different sizes and densities at various locations in particle trajectory model. At the end, data are analyzed to understand the interrelations among filter physics parameters as well as particle trajectory parameters. It is found that velocity magnitude is linearly increasing form center to outer diameter of the disk drive. It is also observed that velocity and pressure magnitudes are higher at the bottom and left corner of the filter interfaces respectively. In addition, velocity magnitude inside filter cavity is very low compared to the rotating disks velocity. Particle trajectory tends to be different according to its sizes, densities and injection positions. Based on the data analysis, a relationship among the filter physics parameters has been established. It is found that track particle velocity and residence time have an inversely proportional relationship. Additionally, based upon the analyzed data, it can be claimed that top disk injected particles have maximum travel distance. Therefore, the present thesis forms a foundation for further investigations by varying disk rotational speed with filter sizes and positions inside disk drive. In addition, particle sizes and densities can be varied to realize the particle trajectory behavior more intensely. |
| Year | 2010 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ISE-10-05 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Industrial Systems Engineering (ISE) |
| Chairperson(s) | Huynh Trung Luong |
| Examination Committee(s) | Dutta, Joydeep;Pisut Koomsap;Tuma, Dam |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2010 |