Local heat transfer characteristics in a single rotating disk and co-rotating disks

Hyung Hee Cho, C. H. Won, G. Y. Ryu, D. H. Rhee

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The present study investigates convective heat/ mass transfer and flow characteristics inside rotating disks. The rotating disks are simulated on the commonly used 3.5″ hard disk drives (HDD). The experiments are conducted for the various hub heights of 5, 10 and 15 mm in a single rotating disk and 4, 6 and 8 mm in co-rotating disks and for the various rotating Reynolds numbers of 5.53 ″ 104, 8.53 ″ 104 and 1.13 ″ 105. To accommodate the general operating conditions of HDD, the experiments are also conducted with an obstruction of rectangular crosssection in the space, which simulates a read-write head arm. A naphthalene sublimation technique is employed to determine the detailed local heat 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 disk rotation. The results of a single rotating disk show that the heat transfer on the rotating disk is enhanced considerably according to the reduction of the hub height and the increase of the rotating Reynolds number. The head arm inserted in the cavity between the rotating disk and the cover enhances uniformity of the heat/mass transfer on the disk due to the deficit of the momentum in the average flow despite the enhancement of the tangential component of fluctuation velocity. The heat/mass transfer rates on the co-rotating disks have very low values near the hub in the inner region of the solid-body rotation and increase rapidly toward the outer region. The change of heat/mass transfer for various hub heights is negligible.

Original languageEnglish
Pages (from-to)399-408
Number of pages10
JournalMicrosystem Technologies
Volume9
Issue number6-7
DOIs
Publication statusPublished - 2003 Sep 1

Fingerprint

rotating disks
Rotating disks
heat transfer
Heat transfer
hubs
mass transfer
Mass transfer
heat
Hard disk storage
Reynolds number
flow distribution
Sublimation
flow characteristics
Naphthalene
heat transfer coefficients
sublimation
velocity measurement
naphthalene
Flow patterns
Heat transfer coefficients

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

Cho, Hyung Hee ; Won, C. H. ; Ryu, G. Y. ; Rhee, D. H. / Local heat transfer characteristics in a single rotating disk and co-rotating disks. In: Microsystem Technologies. 2003 ; Vol. 9, No. 6-7. pp. 399-408.
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Local heat transfer characteristics in a single rotating disk and co-rotating disks. / Cho, Hyung Hee; Won, C. H.; Ryu, G. Y.; Rhee, D. H.

In: Microsystem Technologies, Vol. 9, No. 6-7, 01.09.2003, p. 399-408.

Research output: Contribution to journalArticle

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