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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

Faghri, A., 1995, Heat Pipe Science and Technology, Taylor & Francis, Washington, DC.
Faghri, A., 1999, “Recent Advances and Challenges in Micro/Miniature Heat Pipes,” Proceedings of 11th International Heat Pipe Conference, Tokyo, Japan.
Akachi, H., 1994, Looped Capillary Heat Pipe, Japanese Patent, No. Hei6-97147.
Lee, W. H., Jung, H. S., Kim, J. H., and Kim J. S., 1999, “Flow Visualization of Oscillating Capillary Tube Heat Pipe,” Proceedings of 11th International Heat Pipe Conference, Tokyo, Japan, pp. 131–136.
Gi, K., Maezawa, S., Kojima, Y., and Yamazaki, N., 1999, “CPU Cooling of Notebook PC by Oscillating Heat Pipe,” Proceedings of 11th International Heat Pipe Conference, Tokyo, Japan, pp. 166–169.
Miyazaki, Y., and Arikawa, M., 1999, “Oscillatory Flow in The Oscillating Heat Pipe,” Proceedings of 11th International Heat Pipe Conference, pp. 143–148, Tokyo, Japan.
Kiseev, V. M., and Zolkin, K. A., 1999, “The Influence of Acceleration on The Performance of Oscillating Heat Pipe,” Proceedings of 11th International Heat Pipe Conference, Tokyo, Japan, pp. 154–158.
Dobson, R. T., and Harms, T. M. 1999, “Lumped Parameter Analysis of Closed and Open Oscillatory Heat Pipes,” Proceedings of 11th International Heat Pipe Conference, Tokyo, Japan, pp. 137–142.
Wong, T. N., Tong, B. Y., Lim, S. M., and Ooi, K. T., 1999, “Theoretical Modeling of Pulsating Heat Pipe,” Proceedings of 11th International Heat Pipe Conference, Tokyo, Japan, pp. 159–163.
Hosoda, M., Nishio, S., and Shirakashi, R., 1999, “Meandering Closed-Loop Heat-Transport Tube (Propagation Phenomena of Vapor Plug),” Proceedings of the 5th ASME/JSME Joint Thermal Engineering Conference, March 15–19, San Diego, CA.
Teng,  H., Cheng,  P., and Zhao,  T. S., 1999, “Instability of Condensate Film and Capillary Blocking in Small-Diameter-Thermosyphon Condensers,” Int. J. Heat Mass Transf. 42, pp. 3071–3083.
Bejan, B., 1995, Convection Heat Transfer, 2nd edition, John Wiley & Sons, Inc., New York.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York.
Gi, K., Sato, F., and Maezawa, S., 1999, “Flow Visualization Experiment on Oscillating Heat Pipe,” Proceedings of 11th International Heat Pipe Conference, Tokyo, Japan, pp. 149–153.

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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