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Research Papers

Evaporative Heat Transfer Analysis of a Heat Pipe With Hybrid Axial Groove

[+] Author and Article Information
Lizhan Bai

e-mail: bailizhan@sina.com

Guiping Lin

School of Aeronautical Science and Engineering,
Beihang University,
Beijing, 100191, P.R. China

G. P. Peterson

Woodruff School of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30318

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received June 6, 2012; final manuscript received October 29, 2012; published online February 11, 2013. Assoc. Editor: Bruce L. Drolen.

J. Heat Transfer 135(3), 031503 (Feb 11, 2013) (9 pages) Paper No: HT-12-1273; doi: 10.1115/1.4022996 History: Received June 06, 2012; Revised October 29, 2012

Through the application of thin film evaporation theory and the fundamental operating principles of heat pipes, a hybrid axial groove has been developed that can greatly enhance the performance characteristics of conventional heat pipes. This hybrid axial groove is composed of a V-shaped channel connected with a circular channel through a very narrow longitudinal slot. During the operation, the V-shaped channel can provide high capillary pressure to drive the fluid flow and still maintain a large evaporative heat transfer coefficient. The large circular channel serves as the main path for the condensate return from the condenser to the evaporator and results in a very low flow resistance. The combination of a high evaporative heat transfer coefficient and a low flow resistance results in considerable enhancement in the heat transport capability of conventional heat pipes. In the present work, a detailed mathematical model for the evaporative heat transfer of a single groove has been established based on the conservation principles for mass, momentum and energy, and the modeling results quantitatively verify that this particular configuration has an enhanced evaporative heat transfer performance compared with that of conventional rectangular groove, due to the considerable reduction in the liquid film thickness and a corresponding increase in the evaporative heat transfer area in both the evaporating liquid film region and the meniscus region.

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Figures

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Fig. 1

Cross-sectional structure of monogroove [22]

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Fig. 2

Cross-sectional structure of “Ω”-shaped groove [22]

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Fig. 3

Cross-sectional structure of the hybrid axial groove

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Fig. 4

Coordinate system of the evaporating liquid film region

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Fig. 5

Coordinate system of the meniscus region for rectangular groove

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Fig. 6

Coordinate system of the meniscus region for the hybrid groove

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Fig. 10

Variation of heat flux and heat transfer coefficient in evaporating liquid film region for hybrid groove

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Fig. 7

Variation of liquid film thickness and interface temperature in evaporating liquid film region for rectangular groove

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Fig. 8

Variation of heat flux and heat transfer coefficient in evaporating liquid film region for rectangular groove

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Fig. 9

Variation of liquid film thickness and interface temperature in evaporating liquid film region for hybrid groove

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Fig. 11

Variation of liquid film thickness in meniscus region

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Fig. 12

Variation of liquid/vapor interface temperature in meniscus region

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Fig. 13

Variation of heat flux in meniscus region

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Fig. 14

Variation of heat transfer coefficient in meniscus region

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Fig. 15

Heat transfer rate at evaporating liquid film region and meniscus region

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