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Research Papers: Evaporation, Boiling, and Condensation

Experimental Investigation of a Three-Layer Oscillating Heat Pipe

[+] Author and Article Information
C. D. Smoot

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

H. B. Ma

LaPierre Professor
Department of Mechanical and
Aerospace Engineering,
University of Missouri,
Columbia, MO 65211
e-mail: mah@missouri.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 16, 2013; final manuscript received October 16, 2013; published online February 26, 2014. Assoc. Editor: Bruce L. Drolen.

J. Heat Transfer 136(5), 051501 (Feb 26, 2014) (6 pages) Paper No: HT-13-1081; doi: 10.1115/1.4026217 History: Received February 16, 2013; Revised October 16, 2013

An experimental investigation of a compact, triple-layer oscillating heat pipe (OHP) has been conducted to determine the channel layer effect on the heat transport capability in an OHP. The OHP has dimensions 13 mm thick, 229 mm long, and 76 mm wide embedded with two-independent closed loops forming three layers of channels. The unique design of the investigated OHP can be readily used to explore the channel layering effect on the heat transport capability in the OHP. The experimental results show that the addition of channel layers can increase the total power and at the same time, it can increase the effective thermal conductivity of the OHP. When the OHP switches from one layer of channels to two layers of channels, the highest effective thermal conductivity can be increased from 5760 W/mK to 26,560 W/mK. At the same time, the dryout limit can be increased. With three layers of channels, the OHP investigated herein can transport a power up to 8 kW with a heat flux level of 103 W/cm2 achieving an effective thermal conductivity of 33,170 W/mK.

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Figures

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Fig. 1

Cross-sectional view of three-layer OHP (outer interconnected layers forming an interconnected loop and inner single layer forming an interconnected loop)

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Fig. 2

Schematic of experimental setup

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Fig. 3

Thermocouple locations (unit: cm)

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Fig. 4

Layer effect on temperature differences across the adiabatic section

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Fig. 5

Dryout experiment of the OHP with one-layer interconnected loop in the vertical orientation, increasing power from 5500 W to 6500 W

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Fig. 6

Effects of channel layer and orientation on the effective thermal conductivity

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Fig. 7

Temperature oscillation comparison at an input power of 2.0 kW for (a) two-layer configuration and (b) a three-layer configuration

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Fig. 8

Temperature oscillation comparison at an input power of 8.0 kW for (a) two-layer configuration and (b) a three-layer configuration

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