Heat Transfer Characteristics on a Single Rotating Disk with a Shrouded Cover

Title & Authors
Heat Transfer Characteristics on a Single Rotating Disk with a Shrouded Cover
Ryu, Goo-Young; Won, Chung-Ho; Cho, Hyung-Hee;

Abstract
The present study investigates the local heat/mass transfer characteristics on a rotating disk which is the top disk covered with a shroud in HDD. The naphthalene sublimation technique is employed to determine the local heat/mass transfer coefficients on the rotating disk. Flow field measurements using Laser Doppler Anemometry (LDA) and numerical calculations are performed to analyze the flow patterns induced by the disk rotation. HDD has been developed for compactness and speedy data access, thus the rotating velocity of the disk is increased and the height of a hub is decreased. The experiments are conducted for the various hub heights of 5, 10 and 15 mm, for the rotating Reynolds numbers of $\small{5.5{\times}10^4}$ to $\small{1.1{\times}10^5}$ and for the effects of the presence of a read/write head arm. The results show that the heat transfer on the rotating disk is enhanced considerably for the decrease of the hub height and for the increase of the rotating Reynolds number. The head arm inserted in the cavity decreases the heat transfer despite the enhancement of tangential RMS velocity because of the deficit of the momentum in the flow field.
Keywords
Rotating Flow;Rotating Disk;Heat/Mass Transfer;LDA Measurement;HDD;
Language
Korean
Cited by
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