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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

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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