Decreasing Airflow Velocity in Hard Disk Drives With a Spoiler and Bypass

Airflow changes in a hard disk drive (HDD) with a bypass and a spoiler were clarified by large eddy simulation (LES) and particle image velocimetry (PIV). These analyses show that the spoiler decreases the flow velocity near the arm by decreasing average flow velocity between the disks such as diverging the flow into the bypass channel, and by moving the high-speed-flow area toward the inner-radius area of the disks. The arm vibration is reduced with 30% by these effects