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Research Papers: Evaporation, Boiling, and Condensation

Evaporation/Boiling Heat Transfer Performance in a Sintered Copper Mesh Structure

[+] Author and Article Information
Y. H. Diao

The Department of Building Environment
and Facility Engineering,
The College of Architecture
and Civil Engineering,
Beijing University of Technology,
No.100 Pingleyuan, Chaoyang District,
Beijing 100124, China
e-mail: diaoyanhua@bjut.edu.cn

Y. Liu, Y. H. Zhao, S. Wang

The Department of Building Environment
and Facility Engineering,
The College of Architecture
and Civil Engineering,
Beijing University of Technology,
No.100 Pingleyuan, Chaoyang District,
Beijing 100124, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 3, 2013; final manuscript received March 22, 2014; published online April 23, 2014. Assoc. Editor: Bruce L. Drolen.

J. Heat Transfer 136(8), 081502 (Apr 23, 2014) (10 pages) Paper No: HT-13-1335; doi: 10.1115/1.4027349 History: Received July 03, 2013; Revised March 22, 2014

In this study, experimental investigations regarding the heat transfer performance of an evaporator with capillary wick are presented. The capillary wick structure is composed of sintered multilayer copper mesh. The multilayer copper mesh was sintered on the copper plate. With different combinations of mesh screens, the wick thickness of mesh 140 ranged from 0.6 to 1.0 mm, and those of meshes 60 and 140/60 were both 1.0 mm. The operating pressures used in this study were 0.86 × 105, 0.91 × 105, 0.96 × 105, 1.01 × 105, and 2.0 × 105Pa. The experimental results indicate that the heat transfer performance was strongly dependent on the thickness of the sintered mesh structure and on the mesh size. The operating pressure also has a strong influence on the evaporation/boiling heat transfer performance of a mesh structure sintered using a single mesh size. However, it was also observed that the evaporation/boiling heat coefficient increased with an increase in the thickness of the capillary wick structure, which is less than 1.0 mm. The experimental results further illustrate that the composite sintered mesh structure was capable of properly enhancing the heat transfer performance, especially under high pressure. The maximum enhancement was 31.98%.

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References

Figures

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Fig. 4

Heat flux density as a function of superheat

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Fig. 5

Heat transfer coefficient as a function of heat flux density

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Fig. 3

Structure of heating block and thermocouples

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Fig. 2

Schematic of experimental apparatus

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Fig. 1

Sintered screen mesh structure

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Fig. 6

Heat transfer performance of mesh size 140 with the thickness 1.0 mm at different pressures

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Fig. 7

Heat transfer performance of mesh size 60 with the thickness 1.0 mm at different pressures

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Fig. 8

Heat flux density as a function of superheat at different pressures

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Fig. 9

Heat transfer coefficient as a function of heat flux density for different mesh sizes

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