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Research Papers: Evaporation, Boiling, and Condensation

Heat Transport Capability in an Oscillating Heat Pipe

[+] Author and Article Information
H. B. Ma

Department of Mechanical and Aerospace Engineering,  University of Missouri-Columbia, Columbia, MO 65211mah@missouri.edu

B. Borgmeyer, P. Cheng, Y. Zhang

Department of Mechanical and Aerospace Engineering,  University of Missouri-Columbia, Columbia, MO 65211

J. Heat Transfer 130(8), 081501 (May 29, 2008) (7 pages) doi:10.1115/1.2909081 History: Received April 25, 2007; Revised July 24, 2007; Published May 29, 2008

A mathematical model predicting the oscillating motion in an oscillating heat pipe is developed. The model considers the vapor bubble as the gas spring for the oscillating motions including effects of operating temperature, nonlinear vapor bulk modulus, and temperature difference between the evaporator and the condenser. Combining the oscillating motion predicted by the model, a mathematical model predicting the temperature difference between the evaporator and the condenser is developed including the effects of the forced convection heat transfer due to the oscillating motion, the confined evaporating heat transfer in the evaporating section, and the thin film condensation in the condensing section. In order to verify the mathematical model, an experimental investigation was conducted on a copper oscillating heat pipe with eight turns. Experimental results indicate that there exists an onset power input for the excitation of oscillating motions in an oscillating heat pipe, i.e., when the input power or the temperature difference from the evaporating section to the condensing section was higher than this onset value the oscillating motion started, resulting in an enhancement of the heat transfer in the oscillating heat pipe. Results of the combined theoretical and experimental investigation will assist in optimizing the heat transfer performance and provide a better understanding of heat transfer mechanisms occurring in the oscillating heat pipe.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of an OHP

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Figure 2

Schematic of experimental system

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Figure 3

Experimental heat pipe and dimensioned drawing: (a) photo; (b) dimensions (cm)

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Figure 4

Slug position versus time for linear and nonlinear equations at operating temperatures of (a) 20°C; (b) 60°C; (c) 100°C

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Figure 5

Slug position versus time for nonlinear equations at an operating temperature of 100°C and varied temperature difference

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Figure 6

Micro-, macro-, and total heat transfer coefficients versus heat input at operating temperatures of (a) 20°C and (b) 60°C

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Figure 7

Evaporator, condenser, and total temperature differences versus heat input at operating temperatures of (a) 20°C and (b) 60°C

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Figure 8

Experimental and theoretical total temperature differences versus heat input at operating temperatures of 20°C and 60°C

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