Local heat transfer characteristics in HDD with ventilation hub

Hyung Hee Cho, Chung Ho Won, Dong Ho Rhee, Sung Kook Hong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The purpose of this study is to investigate heat/mass transfer and flow characteristics inside co-rotating disks with hub having ventilation holes. Naphthalene sublimation technique is employed to determine the local heat/mass transfer coefficients on the rotating disks using the heat and mass transfer analogy. Flow field measurements are conducted using Laser Doppler Anemometry (LDA) and numerical calculations are performed simultaneously to analyze the flow patterns induced by the disk rotation. The experiments are conducted for the Rossby number of 0.04, 0.1, and 0.35 to evaluate the influence of incoming flows through the holes on the hub. The basic flow structure in a cavity between co-rotating disks consists of three regions; the solid-body rotating inner region, the outer region with unsteady vortices and the shroud boundary layer region. The heat/mass transfer rates on the co-rotating disks are very low near the hub due to the solid-body rotation and increase rapidly in the outer region due to turbulence mixing. The modified hub with the ventilation holes enhances significantly the heat/mass transfer rates on the region near the hub.

Original languageEnglish
Title of host publicationAsia-Pacific Magnetic Recording Conference 2004, Digest of APMRC 2004
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages103-104
Number of pages2
ISBN (Electronic)0780387171, 9780780387171
DOIs
Publication statusPublished - 2004
Event2004 Asia-Pacific Magnetic Recording Conference, APMRC 2004 - Seoul, Korea, Republic of
Duration: 2004 Aug 162004 Aug 19

Publication series

NameAsia-Pacific Magnetic Recording Conference 2004, Digest of APMRC 2004

Other

Other2004 Asia-Pacific Magnetic Recording Conference, APMRC 2004
CountryKorea, Republic of
CitySeoul
Period04/8/1604/8/19

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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