Abstract
Recently the size of magnetic disk memories becomes larger. And now, disk fluttering is an important problem. Yet, few studies about this problem have been performed.The flow between two parallel rotating disks has been visualized with aluminium flake or coloured water. However, photographs obtained by these methods were not clear.
We studied especially about central-cramp type disk pack without center air blow-off. And by means of smoke wire, we obtained clear visualized photographs of the pattern of the air flow between the disks. These photographs show that the shroud makes the flow stable, and that espesially when the spoiler is inserted more than about one-third of the disk radius, the flow becomes extremely stable.
