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Research Papers: Evaporation, Boiling, and Condensation

Thermal and Visual Observation of Water and Acetone Oscillating Heat Pipes

[+] Author and Article Information
C. Wilson

Department of Marine Engineering, Dalian Maritime University, Dalian 116026, PR China

B. Borgmeyer, R. A. Winholtz

Department of Mechanical and Aerospace Engineering, University of Missouri–Columbia, Columbia, MO 65201

H. B. Ma1

Department of Mechanical and Aerospace Engineering, University of Missouri–Columbia, Columbia, MO 65201mah@missouri.edu

D. Jacobson, D. Hussey

 National Institute of Standards and Technologies, 100 Bureau Drive, Gaithersburg, MD 20899

1

Corresponding author.

J. Heat Transfer 133(6), 061502 (Mar 08, 2011) (5 pages) doi:10.1115/1.4003546 History: Received June 02, 2010; Revised December 16, 2010; Published March 08, 2011; Online March 08, 2011

A visual and thermal experimental investigation of four oscillating heat pipes (OHPs) was conducted to observe fluid flow of liquid plugs and vapor bubbles in the OHP and its effect on the temperature distribution and heat transfer performance in an OHP. These four OHPs consist of an open loop water OHP, an open loop acetone OHP, a closed loop water OHP, and a closed loop acetone OHP. These copper OHPs were constructed identically with all six turns in the same plane. They were constructed out of 1.65 mm inner diameter copper tubing and copper heat spreading plates in the evaporator and condenser regions. The heat pipes were charged at a filling ratio of about 50%. The results show that the acetone OHP at low power performs better than the water OHP, while at high power the water OHP exceeds the acetone OHP. The experimental results show that both the acetone and water closed loop OHPs had reduced movement in the connecting turn between the two sides. However, in the water closed loop OHP, this prevented circulation altogether. Comparing the water closed loop OHP to the water open loop OHP, their flow patterns were similar. Therefore, improving the flow in this turn should increase the closed loop OHP’s performance.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 3

Evaporator temperature oscillations at 100 W and a condenser temperature of 20°C: (a) water OHP and (b) acetone OHP

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Figure 4

A comparison of thermal data with neutron images of the closed loop water and acetone OHPs in the horizontal orientation at 50 W and a condenser temperature of 60°C: (a) evaporator temperature and (b) neutron images of fluid movement

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Figure 5

The average temperature difference of (a) the closed loop acetone oscillating heat pipe and (b) closed loop water oscillating heat pipe at condenser temperatures of 20°C and 60°C and in a vertical and horizontal orientation

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Figure 6

The pixel standard deviation for the open and closed loops, water, and acetone OHPs (vertical orientation with a power input of 50 W and a condenser temperature of 60°C). The bright regions are where the standard deviation is highest.

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Figure 2

Experimental setup: (a) schematic and (b) photo of neutron imaging system

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Figure 1

OHP prototypes: (a) schematic of the open loop OHP, (b) schematic of the closed loop OHP, (c) photo of the finished OHP, and (d) neutron radiography image of the OHP (units in cm)

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