C201 HEAT TRANSFER AND FLOW CHARACTERISTICS IN A SINGLE ROTATING DISK AND CO-ROTATING DISKS(Heat transfer in complex system-2)

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概要

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• The present study investigates convective heat/mass transfer and flow characteristics inside rotating disks which are modeled on the commonly used 3.5" Hard Disk Drivers (HDD). 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 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 5.5 × 10^4, 8.5 × 10^4 and 1.1 × 10^5. To accommodate the general operating conditions of HDD, which include a read-write head arm, the experiments are also conducted with an obstruction of rectangular cross-section in a cavity. The results of a single rotating disk show that the heat transfer on the rotating disk is enhanced considerably according to the decrease 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 makes the heat/mass transfer be uniformalized due to the deficit of the momentum in the average flow despite the enhancement of tangential component of fluctuation velocity. The heat/mass transfer rates on the co-rotating disks have 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.

• 一般社団法人日本機械学会の論文
• 2000-10-01

著者

• Cho Hyung

  Department Of Mechanical Engineering Yonsei University

• Ryu Goo

  Department Of Mechanical Engineering Yonsei University

• Cho Hyung

  Department Of Mechanical Engineering

• Won Chung

  Department Of Mechanical Engineering Yonsei University

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• C201 HEAT TRANSFER AND FLOW CHARACTERISTICS IN A SINGLE ROTATING DISK AND CO-ROTATING DISKS(Heat transfer in complex system-2)
• Enhancement of Film Cooling Performance Using a Shaped Film Cooling Hole with Compound Angle Injection

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