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TECHNICAL PAPERS: Heat Pipes

Thermal Modeling of Unlooped and Looped Pulsating Heat Pipes

[+] Author and Article Information
Mohammad B. Shafii, Amir Faghri, Yuwen Zhang

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139

J. Heat Transfer 123(6), 1159-1172 (May 30, 2001) (14 pages) doi:10.1115/1.1409266 History: Received July 11, 2000; Revised May 30, 2001
Copyright © 2001 by ASME
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References

Figures

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Oscillating heat pipes: (a) unlooped PHP; (b) looped PHP.
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(a) Control volume of a liquid slug in a vertical tube; (b) control volume of ith liquid plug.
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Comparison of the pressure variation with time: (a) without gravity; (b) with gravity; and (c) comparison with a previous model.
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The variation of the total number of vapor plugs with time
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Unlooped PHP including three vapor plugs
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Variation of pressure, temperature, and the end positions of the first plug with time (d=1.5 mm)
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Variation of pressure, temperature, and the end positions of the second plug with time (d=1.5 mm)
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Variation of pressure, temperature, and the end positions of the third plug with time (d=1.5 mm)
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The evaporative and condensation heat transfer rate
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Sensible heat transferred in and out of liquid slugs
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Temperature of the first liquid slug: (a) distribution along the left end of the first liquid slug; and (b) variation with time.
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Effect of the diameter of PHP on the performance of the first vapor plug
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Effect of PHP diameter on the total evaporative heat transfer rate
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Effect of the heating wall temperature on the performance of the first plug
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Effect of the heating wall temperature on the total evaporative heat transfer rate
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Effect of the charge ratio on the performance of the first plug
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Effect of the charge ratio on the total evaporative heat transfer rate
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Variation of pressures, temperatures, and the end positions of the first and second plugs with time for looped PHP (d=1.5 mm)
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Variation of heat transfer rate with time for looped PHP: (a) sensible heat; and (b) evaporative and condensation heat.

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