Simulation of Static Flying Attitudes with Different Heat Transfer Models for a Flying-Height Control Slider with Thermal Protrusion |
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Authors: | Du Chen David B Bogy |
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Affiliation: | (1) Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA;(2) Present address: Hitachi, GST, 5601 Great Oaks Parkway, San Jose, CA 95193, USA |
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Abstract: | The thermal flying height control (TFC), aka dynamic fly height (DFH), technique has been recently used in the head disk interface
of hard disk drives to obtain a lower head-media spacing. The air bearing cooling effect, i.e., the heat conduction between
the slider and the air film, has been incorporated in the numerical thermal–mechanical simulation of the slider’s static performance.
However, the heating effect of the viscous dissipation of the air flow has not been considered yet. In this article, both
effects are included in the simulation of a flying slider with its flying height controlled by thermal protrusion, and different
models for the air bearing cooling are used to obtain the slider’s static flying attitudes. The simulation results directly
show that the air bearing cooling is dominant compared with the viscous heating. All of the air bearing cooling models, including
a recent one that considers the dependence of the air molecular mean free path on the air temperature, have simulation results
close to each other. The largest relative difference in the simulated flying height is less than 9% even when the transducer
flying height is lowered to below 2 nm. |
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Keywords: | |
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