The airflow of a 10,000 rpm hard disk drive is simulated using the LES turbulent model. The critical parameters for using LES model to get the correct/reliable result are discussed. The flow induced vibration of the head gimbal assembly is calculated with the obtained fluid force acting on the head gimbal assembly (HGA) and compared with measured results. Good agreement is observed between the measured and simulated results. The optimization of the airflow is further carried out to reduce the flow induced vibration of the HGA. It is found that almost 50% reduction of flow induced vibration of the HGA can be achieved with the proposed modifications for airflow optimization.

Combined temperature and species gradients induced buoyancy-driven natural convection ow of cold water at temperatures in the neighbourhood of the temperature of maximum density is investigated. Further, it is assumed that the addition of solutes to pure water raises the temperature of maximum density. Numerical solutions of the governing equations are sought using alternating direction implicit (ADI) and successive over relaxation (SOR) methods. The results of the investigation are presented in the form of streamlines, isotherms and isoconcentration lines. The average heat and mass transfer rates calculated, are found to depend nonlinearly on temperature gradient in the cavity.

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