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TECHNICAL PAPERS: Heat Pipes

An Experimental Investigation of the Transient Characteristics on a Flat-Plate Heat Pipe During Startup and Shutdown Operations

[+] Author and Article Information
Y. Wang, K. Vafai

Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210-1107

J. Heat Transfer 122(3), 525-535 (Feb 23, 2000) (11 pages) doi:10.1115/1.1287725 History: Received July 03, 1999; Revised February 23, 2000
Copyright © 2000 by ASME
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References

Chi, S. W., 1976, Heat Pipe Theory and Practice, Hemisphere, Washington, DC.
Peterson, G. P., 1990, “Thermal Control of Electronic Equipment and Devices,” Advances in Heat Transfer, Vol. 20, Hartnett, J. P., and Irvine, T. F., Jr., eds., Academic Press, San Diego, CA, pp. 181–314.
Vafai,  K., and Wang,  W., 1992, “Analysis of Flow and Heat Transfer Characteristics of an Asymmetrical Flat Plate Heat Pipe,” Int. J. Heat Mass Transf., 35, pp. 2087–2099.
Zhu,  N., and Vafai,  K., 1998, “Vapor and Liquid Flow in an Asymmetrical Flat Plate Heat Pipe: A Three-Dimensional Analytical and Numerical Investigation,” Int. J. Heat Mass Transf., 41, pp. 159–174.
Zhu,  N., and Vafai,  K., 1998, “Analytical Modeling of the Startup Characteristics of Asymmetrical Flat Plate and Disk-Shaped Heat Pipes,” Int. J. Heat Mass Transf., 41, No. 17, pp. 2619–2637.
Wang,  Y., and Vafai,  K., 1999, “Transient Characterization of Flat Plate Heat Pipes During Startup and Shutdown Processes,” Int. J. Heat Mass Transf., 43, No. 15, pp. 2641–2655.
Reay, D. A., ed., Proc. IV Int. Heat Pipe Conference, Pergamon Press, Oxford, UK.
Basiulis, A., Tanzer, H., and McCabe, S., 1986, “Thermal Management of High Power PWB’S Through the Use of Heat Pipe Substrates,” Proc. 6th Annual International Electronic Packaging Conference, Int. Electron. Packaging Soc., pp. 501–515.
Thomson, M., Ruel, C., and Donato, M., 1989, “Characterization of a Flat Plate Heat Pipe for Electronic Cooling in a Space Environment,” Heat Transfer in Electronics, ASME, New York, pp. 59–65.
Bong,  T. Y., Ng,  K. C., and Bao,  H., 1993, “Thermal Performance of a Flat-Plate Heat-Pipe Collector Array,” Sol. Energy, 50, pp. 491–498.
Chen,  K. S., Tsai,  S. T., and Yang,  Y. W., 1994, “Heat Performance of a Double-Loop Separate-Type Hat Pipe: Measurement Results,” Energy Convers. Manage., 35, pp. 1131–1141.
Khrustalev,  D., and Faghri,  A., 1995, “Thermal Characteristics of Conventional and Flat Miniature Axially Grooved Heat Pipes,” ASME J. Heat Transfer, 117, pp. 1038–1054.
Huang,  X. Y., and Liu,  C. Y., 1996, “The Pressure and Velocity Fields in the Wick Structure of a Localized Heated Flat Plate Heat Pipe,” Int. J. Heat Mass Transf., 39, pp. 1325–1330.
Khrustalev,  D., and Faghri,  A., 1996, “Estimation of the Maximum Heat Flux in the Inverted Meniscus Type Evaporator of a Flat Miniature Heat Pipe,” Int. J. Heat Mass Transf., 39, pp. 1899–1909.
Wei,  J., Hijikara,  K., Takayoshi,  I., 1997, “Fin Efficiency Enhancements Using a Gravity-Assisted Heat Pipe,” Int. J. Heat Mass Transf., 40, pp. 1045–1051.
Faghri, A., 1995, Heat Pipe Science and Technology, Taylor and Francis, Bristol, PA.
Vafai,  K., Zhu,  N., and Wang,  W., 1995, “Analysis of Asymmetrical Disk-Shaped and Flat Plate Heat Pipes,” ASME J. Heat Transfer, 117, pp. 209–218.
Wang,  Y., and Vafai,  K., 2000, “An Experimental Investigation of the Thermal Performance of an Asymmetrical Flat Plate Heat Pipe,” Int. J. Heat Mass Transf., 43, No. 15, pp. 2657–2668.
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Figures

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Temperature distribution along the z-direction at different times: qe=15500 W/m2,hconv=1230 W/(m2°C)
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Transient temperature distribution along the normal direction: qe=15500 W/m2,hconv=1060 W/(m2°C)
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Effect of variations in heat transfer coefficient and input power on the maximum temperature rise
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Compact representation of the maximum temperature rise in terms of the heat transfer coefficient and input heat flux
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Effect of input heat flux on the maximum temperature difference
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Time constants for different input heat fluxes for startup and shutdown operations
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Temporal temperature distribution for a cyclical operation: qe=8830 W/m2,hconv=1260 W/(m2°C)
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Temporal temperature distribution for a cyclical operation: qe=14,000 W/m2,hconv=1210 W/(m2°C)
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Transient temperature distribution along the normal direction: qe=5580 W/m2,hconv=285 W/(m2°C)
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Schematic of the flat-plate heat pipe: (a) geometry of the heat pipe, (b) cross-sectional view of the heat pipe
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Experimental setup: (a) experimental system, (b) cross-sectional view of the channel, (c) location of thermocouples on the heat pipe surfaces
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Temporal temperature rise for the outside surfaces of the heat pipe for different input heat fluxes
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Heat flux variations for different power inputs
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Temporal temperature rise for the outside wall of the heat pipe for various heat transfer coefficients
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Effect of heat transfer coefficient variations on the heat flux distribution
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Temperature distribution along the z-direction at different times: qe=5580 W/m2,hconv=285 W/(m2°C)

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