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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

Figures

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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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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=5580 W/m2,hconv=285 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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