Effects of varied dimension of 150 degree circumferential spoiler shape

Abstract

The air flow effect from variation of spoiler dimensionis studied in 3.5 hard disk drive running with speed of 20,000 rpm using CFD technique. The steady k-є is used for turbulent model. The results show relationships which are: an increase in the thickness of the spoiler reduces the RMS of wind velocity at the OD zone and an increase in the width of the spoiler reduces the RMS of windvelocity at the downstream of spoiler position. The increasing of thickness and width affected to the flow at ID position by divert flow and increase flow velocity. The spoiler model having 21.5 mm. width and 1 mm. thickness can reduce the RMS of wind velocity inside the hard disk drive by 59.39 %