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Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

EXPERIMENTAL STUDY OF THE FLOW IN A SIMULATED HARD DISK DRIVE

pages 129-134
DOI: 10.1615/TSFP4.220
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RÉSUMÉ

Instantaneous circumferential and radial velocity components of the air flowing past a symmetrical pair of suspension/slider-units (SSUs) attached to an E-Block/arm were measured in an especially designed corotating disk apparatus using the particle image velocimetry technique. The geometrical components in the apparatus test section are scaled by a factor of two relative to those of a nominal 3½ inch hard disk drive. Most of the measurements were obtained on the interdisk midplane for two angular orientations of the SSUs: one with the tip of the SSUs near to the hub supporting the disks, and one with the tip of the SSUs near the rims of the disks. Data obtained at 250, 500, 1000, 1500 and 2000 rpm were post-processed to yield mean and rms values of the two velocity components, the mean axial vorticity, and the turbulent kinetic energy (based on the two velocity components). By 2000 rpm the mean velocity components were asymptotically independent of disk speed of rotation but their rms values appeared to still be evolving. Aside from their intrinsic fundamental value, discussed in the text, the data serve to guide and test the development of numerical procedures for predicting this complex class of enclosed rotating flows.

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