Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 19, 2024 - November 20, 2024
We investigated flow phenomena using a refractive index-matched model, scaled to 2.25 times the size of an actual 3.5-inch HDD. The model focused on the interaction between the primary moving components: the disk and arm. The rotating disks generates centrifugal forces that drive fluid radially outward, creating a pressure gradient. This setup was studied across three measurement planes, with specific attention to the flow fields between two intermediate planes located between the disks and the arm, relative to the disk-to-disk middle plane. We analyzed in cylindrical coordinates fixed at arm isolation angles of α = 20°, 32°, and 44°, which define the separation of flow between the disk and the shroud opening region. Our findings reveal that the inflow velocity from the shroud opening significantly impacts the velocity distribution around the disk region across all measurement planes. The hub-arm region induces an accelerated flow, affecting the solid body region around the hub for all arm insertion angles. Additionally, the magnitude of the velocity highly depends on the arm's insertion angle across the disk region. The arm isolation angle further influences these dynamics, leading to measurable changes in momentum exchange between the disk and the surrounding flow, particularly in the mid-plane and intermediate regions between the disks and the arm.
