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Research Papers: Two-Phase Flow and Heat Transfer

Effects of Film Evaporation and Condensation on Oscillatory Flow and Heat Transfer in an Oscillating Heat Pipe

[+] Author and Article Information
Wei Shao1

Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211

Yuwen Zhang2

Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211zhangyu@missouri.edu

1

Present address: Parfums Christian Dior (Shanghai) Co Ltd., Shanghai 201206, China.

2

Corresponding author.

J. Heat Transfer 133(4), 042901 (Jan 19, 2011) (11 pages) doi:10.1115/1.4002780 History: Received May 08, 2010; Revised September 27, 2010; Published January 19, 2011; Online January 19, 2011

An advanced theoretical model of a U-shaped minichannel, a building block of a closed-end oscillating heat pipe, has been developed. Thin film evaporation in the evaporator and thin film condensation in the condenser, axial variation of surface temperature, and pressure loss at the bend are incorporated in this model. The sensible heat transfer coefficients between the liquid slug and the wall are obtained by analytical solution for laminar liquid flow and by empirical correlations for turbulent liquid flow. The effects of the inner diameter, evaporator temperature on the thermally induced oscillatory flow and heat transfer performance, and the mechanism of film condensation and evaporation are investigated.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 4

Condensation and evaporation film thickness

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Figure 5

Influence of the evaporator temperature on oscillatory flow and latent heat transfer

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Figure 6

Influence of the evaporator temperature on sensible heat transfer

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Figure 7

Influence of the evaporator temperature on oscillatory flow and latent heat transfer

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Figure 8

Influence of the inner diameter of the minichannel on sensible heat transfer

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Figure 2

Variation of liquid slug displacement, vapor temperature, and vapor pressure (Te=90°C and Tc=70°C)

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Figure 3

Latent heat transfer of vapor 1 and sensible heat transfer of liquid slug (Te=90°C and Tc=70°C)

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