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RESEARCH PAPER

Contact Resistance Measurement and Its Effect on the Thermal Conductivity of Packed Sphere Systems

[+] Author and Article Information
W. W. M. Siu, S. H.-K. Lee

  Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

J. Heat Transfer 126(6), 886-895 (Jan 26, 2005) (10 pages) doi:10.1115/1.1795231 History: Received May 08, 2003; Revised May 24, 2004; Online January 26, 2005
Copyright © 2004 by ASME
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References

Figures

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Schematic showing the temperature jump due to imperfect contact between two surfaces
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Experimental setup shown in a) photo and b) schematic
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Illustration showing a) picture of the piston, b) the location of the thermocouple placement positions, and c) the piston
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Schematic showing the placement of the inner and outer shells
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a) Schematic and b) photo of the sphere-shell utilized to insulate the sphere
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Schematic of a) the upper Vee-block and b) the lower Vee-block
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Plot of the compression deformation for a) 12.19 mm diam aluminum sphere, b) 11.11 mm diam brass sphere, and c) 11.11 mm diam chrome steel sphere
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Temperature measurements showing uniform radial distribution in the a) cool piston and b) hot piston
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Comparison of a) the back-calculated thermal conductivity of aluminum against the range of expected range 155–185 W/m-K between the dotted line and b) the measured thermal resistance value between aluminum surfaces
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Contact resistance measurements for a) aluminum, b) brass, and c) chrome-steel spheres
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Correlation of the contact resistance data for a large number of sphere types and sizes
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Comparison of the measured and predicted transient response of a sphere in contacts with hot and cool pistons
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Plot showing a) the ratio of contact resistance to the total resistance against contact radius for spheres in a Face-center Cubic arrangement and b) the effect of neglecting contact resistance in calculating the effective conductivity for increasing sphere conductivity

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