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Research Papers: Porous Media

Thermophysical Properties of Biporous Heat Pipe Evaporators

[+] Author and Article Information
Tadej Semenic, Ying-Yu Lin

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095-1597

Ivan Catton

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095-1597catton@ucla.edu

J. Heat Transfer 130(2), 022602 (Feb 04, 2008) (10 pages) doi:10.1115/1.2790020 History: Received January 10, 2006; Revised July 04, 2007; Published February 04, 2008

Thirty biporous slugs with 3 different cluster diameters and 5 different particle diameters (15 combinations with 2 repetitions) and 12 monoporous slugs with 6 different particle diameters were sintered from spherical copper powder, and thermophysical properties were measured. The neck size ratio for all the particles was approximately 0.4. The porosity of monoporous samples was found to be independent of particle diameter and was equal to 0.28, and the porosity of biporous samples was found to be independent of cluster and particle diameters, and was equal to 0.64. The liquid permeability and maximum capillary pressure of small pores were found to be a linear function of the particle diameter. Similarly, vapor permeability was found to be a linear function of the cluster diameter. The thermal conductivity of monoporous samples was measured to be 142±3WmK at 42±2°C, and it was independent of particle diameter. The thermal conductivity of biporous samples was found to be a function of cluster to particle diameter ratio.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

SEM photograph of a 586∕74 biporous evaporator (magnification of 50 times)

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Figure 2

Particle size distribution for the 75–90μm particle range

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Figure 3

SEM of the 63–90μm sintered matrix

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Figure 4

Permeability apparatus

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Figure 5

Capillarity apparatus

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Figure 6

Measured pore diameter

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Thermal conductivity apparatus

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Thermal conductivity apparatus calibration curve

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Figure 9

Particle size distributions

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Figure 10

Cluster size distributions

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Average particle diameters

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Maximum capillary pressure

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Liquid permeability

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Figure 15

Vapor permeability

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Thermal conductivity of monoporous samples

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Thermal conductivity of biporous samples

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Figure 18

Thermal conductivity as a function of cluster to particle ratio

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Figure 19

Comparison between different models and measured thermal conductivity

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Figure 20

Normalized capillary pressure and liquid permeability

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Figure 21

Normalized vapor permeability and thermal conductivity

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