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TECHNICAL PAPERS: Electronic Cooling

Axially Tapered Microchannels of High Aspect Ratio for Evaporative Cooling Devices

[+] Author and Article Information
R. H. Nilson, S. K. Griffiths, S. W. Tchikanda

Fluid and Thermal Modeling Department, Sandia National Laboratories, Livermore, California 94551-0969

M. J. Martinez

Multiphase Transport Processes Department, Sandia National Laboratories, Albuquerque, New Mexico 87185-5800

J. Heat Transfer 126(3), 453-462 (Jun 16, 2004) (10 pages) doi:10.1115/1.1735744 History: Received June 06, 2003; Revised February 17, 2004; Online June 16, 2004
Copyright © 2004 by ASME
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References

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Figures

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Liquid configuration within straight microchannels of triangular and rectangular cross section. Straight rectangular channels have a dead zone where capillary pressure does not vary with fluid depth.
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Axially tapered channels increase the available capillary pressure gradient and eliminate the dead zone normally associated with rectangular channels
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Pressure distribution along channel having a 50 percent taper for various heat fluxes. Pressure cannot fall below dotted line indicating minimum pressure based on local width.
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Pressure distributions under conditions of maximum heat flux for various choices of inlet pressure
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Saturation profiles under conditions of maximum heat flux for various choices of inlet pressure
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Saturation profiles under conditions of maximum flux for various choices of the inlet saturation
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Variation of maximum heat flux with inlet pressure for various linear tapers
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Variation of maximum heat flux with opposing gravitational force for various linear tapers
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Variation of maximum heat flux with inlet pressure for various nonlinear tapers
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Variation of maximum heat flux with opposing gravitational force for various nonlinear tapers: m=0.2 (dotted lines); and m=10 (solid lines). Inset illustrates nonlinear taper shapes.
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Variation of maximum heat flux with gravitational force for channels bisected N times by narrow splitter plates (t*=0). Inset schematically illustrates channel geometry for N=3.
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Stepwise variation of width along channels optimized for various gravitational forces, G*. Lengths of first stages are not very sensitive to number of stages, N.
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Comparison of maximum sustainable heat fluxes for tapered (Δw=0.7) and untapered (Δw=0.0) channels having various inlet widths, Wo, and two depths, H=1.0 mm (solid lines) and 0.5 mm (dotted lines)

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