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TECHNICAL PAPERS: Heat Pipes

Transport in Flat Heat Pipes at High Heat Fluxes From Multiple Discrete Sources

[+] Author and Article Information
Unnikrishnan Vadakkan, Suresh V. Garimella, Jayathi Y. Murthy

Cooling Technologies Research Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-2088

J. Heat Transfer 126(3), 347-354 (Jun 16, 2004) (8 pages) doi:10.1115/1.1737773 History: Received June 30, 2003; Revised February 06, 2004; Online June 16, 2004
Copyright © 2004 by ASME
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References

Garimella, S. V., and Sobhan, C. B., 2001, “Recent Advances in the Modeling and Applications of Nonconventional Heat Pipes,” Advances in Heat Transfer, 35 , pp. 249–308, Chpt. 4.
Tien,  C. L., and Rohani,  A. R., 1974, “Analysis of the Effects of Vapor Pressure Drop on Heat Pipe Performance,” Int. J. Heat Mass Transfer, 17, pp. 61–67.
Ooijen,  V., and Hoogendoorn,  C. J., 1979, “Vapor Flow Calculations in a Flat Heat Pipe,” AIAA J., 17, pp. 1251–1259.
Chen,  M. M., and Faghri,  A., 1990, “An Analysis of the Vapor Flow and the Heat Conduction Through the Liquid Wick and Pipe Wall in a Heat Pipe with Single or Multiple Heat Sources,” Int. J. Heat Mass Transfer, 33, pp. 1945–1955.
Issacci,  F., Catton,  I., Heiss,  A., and Ghoniem,  N. M., 1989, “Analysis of Heat Pipe Vapor Dynamics,” Chem. Eng. Commun., 85, pp. 85–94.
Cao,  Y., and Faghri,  A., 1990, “Transient Two-Dimensional Compressible Analysis for High-Temperature Heat Pipes with Pulsed Heat Input,” Numer. Heat Transfer, Part A, 18, pp. 483–502.
Issaci,  F., Catton,  I., and Ghoniem,  N. M., 1991, “Vapor Dynamics of Heat Pipe Start-Up,” ASME J. Heat Transfer, 113, pp. 985–994.
Ambrose,  J. H., and Chow,  L. C., 1991, “Detailed Model for Transient Liquid Flow in Heat Pipe Wicks,” J. Thermophys. Heat Transfer, 5, pp. 532–538.
Tournier,  J. M., and El-Genk,  M. S., 1993, “A Heat Pipe Transient Analysis Model,” Int. J. Heat Mass Transfer, 37, pp. 753–762.
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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 Transfer, 41, pp. 2619–2637.
Um, J. Y., Chow, L. C., and Baker, K., 1994, “An Experimental Investigation of Flat Heat Pipe,” Fundamentals of Heat Pipes, 278 , ASME, New York, pp. 21–26.
Chesser, J. B., Peterson, G. P., and Lee, S., 2000, “A Simplified Method for Determining the Capillary Limitation of Flat Heat Pipes in Electronics Cooling,” Proceedings of NHTC’00, 34th National Heat Transfer Conference, pp. 1–6.
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Chien, L., and Chang, C. C., 2002, “Experimental Study of Evaporator Resistance on Porous Surface in Flat Heat Pipes,” Inter Society Conference on Thermal Phenomena, IEEE, pp. 236–242.
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Figures

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Schematic diagram of the flat heat pipe investigated; the thickness dimension has been greatly exaggerated in this schematic to delineate the different parts of the heat pipe
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Steady-state axial wall temperature variation for different mesh sizes at 15–15 W input power (z/W=0)
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Transient wall temperature under the far-left heater (x/L=0.093,y/H=1,z/W=0.5) for different power input combinations to the two heaters
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Transient variation of the heat removal rates at the evaporator (constant Qin) and condenser (Qout) sections for the three heat input combinations
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Temperature contours at the wall (y/H=1) on the wicked side of the heat pipe at an input power of 15–15 W: the condenser section is delineated by the dashed line.
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Temperature distribution at the mid plane (z/W=0.5) of the heat pipe for the baseline case with 15–15 W heat input (d=5 mm)
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Velocity vectors in the (a) wick and (b) vapor core at the mid plane of the heat pipe (z/W=0.5, with 15–15 W heat input and d=5 mm): note that the velocity scale in the two plots is very different.
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Transient development of pressure drop in the (a) vapor, and (b) liquid, at the liquid-vapor interface (heat input=15–15 W,d=5 mm)
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Temperature contours on the wicked-wall of the heat pipe for heat inputs to the left and right heat sources of (a) 15–15 W, (b) 10–20 W, and (c) 5–25 W (d=5 mm)
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Axial mass flow rate through the wick (d=5 mm)
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Temperature contours in the liquid at the liquid-vapor interface for different separation between the heaters (heat input=5–25 W)
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Liquid velocity vectors in the wick near the liquid vapor interface for different heat source separations (heat input=5–25 W): (a) d=0, (b) 5, and (c) 10 mm.
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Normal (v-) velocities in the liquid at the liquid-vapor interface at different heat source separations (heat input=5–25 W): (a) d=0, (b) 5, and (c) 10 mm. The shading denotes contours of v-velocity.
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Transient development of pressure drop in the (a) vapor, and (b) liquid, at the liquid-vapor interface (heat input 5–25 W and d=5 mm)
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Pressure drop in the liquid and vapor at the liquid-vapor interface at different heat source separation distances (heat input 5–25 W, z/W=0.5)

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