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RESEARCH PAPERS

Study of Transverse Flow Effects on Particle Flows and Contamination of Air Bearing Sliders

[+] Author and Article Information
Xinjiang Shen, David B. Bogy

Department of Mechanical Engineering, University of California at Berkeley, Berkeley CA 94720

Mike Suk

Hitachi Global Storage Technologies, 5600 Cottle Road, San Jose, California 95193

J. Tribol 126(4), 745-750 (Nov 09, 2004) (6 pages) doi:10.1115/1.1757489 History: Received June 05, 2003; Revised November 06, 2003; Online November 09, 2004
Copyright © 2004 by ASME
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References

Liu,  V. C., Pang,  S. C., and Jew,  H., 1965, “Sphere Grad in Flows of Almost-Free Molecules,” Phys. Fluids, 8(5), pp. 788–796.
Saffman,  P. G., 1965, “The Lift on a Small Sphere in A Slow Shear Flow,” J. Fluid Mech., 22, pp. 385–400.
Chen,  X., 1996, “The Drag Force Acting on a Spherical Non-Evaporating or Evaporating Particle Immersed Into a Rarefied Plasma Flow,” J. Phys. D, 29, pp. 995–1005.
Zhang,  S., and Bogy,  D. B., 1997, “Effects of Lift on the Motion of Particles in the Recessed Regions of a Slider,” Phys. Fluids, 9, pp. 1265–1272.
Zhang,  S., and Bogy,  D. B., 1997, “Slider Designs for Controlling Contamination,” ASME J. Tribol., 119, pp. 537–540.
Shen,  X., and Bogy,  D. B., 2002, “Particle Flow and Contamination in Slider Air Bearings for Hard Disk Drives,” ASME J. Tribol., 125, pp. 358–363.
Burgdorder,  A., 1959, “The Influence of the Molecular Mean Free Path on the Performance of Hydrodynamics Gas Lubricated Bearing,” ASME J. Basic Eng., 81(1), pp. 94–100.
Hamrock, B. J., 1991, Fundamentals of Fluid Film Lubrication, NASA Reference Publication 1255, TX.
Lee,  J. W., Yi,  M.-Y., and Lee,  S. M., 2003, “Inertial Focusing of Particles With an Aerodynamics Lens in the Atmospheric Pressure Range,” J. Aerosol Sci., 34, pp. 211–224.
Shah, R. K., and London, A. L., 1978, Laminar Flow Forced Convection in Ducts, Academic Press, New York.
Cox,  R. G., and Hsu,  S. K., 1977, “The Lateral Migration of Solid Particles in A Laminar Flow Near a Plane,” Int. J. Multiphase Flow, 3, pp. 201–222.

Figures

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A sketch of slider-disk assembly and Cartesian coordinates
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Pressure profile of the air-bearing slider
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Spacing between the slider and disk surfaces and locations for comparing different forces by two-dimensional and three-dimensional modeling
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(a) Air streamlines at heights of 1 percent of the slider spacing above the disk; (b) air streamlines at heights of 50 percent of the slider spacing above the disk; and (c) air streamlines at heights of 99 percent of the slider spacing above the disk.
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Spacing between the slider and disk surfaces at y=0.3 mm
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Air vertical velocity in the air-bearing at y=0.3 mm
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Comparison between particle trajectories using two-dimensional and three-dimensional modeling
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Particle flying paths starting at z=2, 3, 5, and 9hm
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Comparison between particle contamination profiles using analysis without and with transverse flow effects: (a) w/o transverse flow; and (b) with transverse flow.
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Experimental observed particle contamination profile on the slider
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Numerical simulated particle contamination profile for the same slider

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