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Research Papers

Experimental Investigation of a Thermosyphon With Microstructure on the Boiling Surface

[+] Author and Article Information
Y. Chai

China United Northwest Institute for Engineering
Design & Research Co. Ltd,
Xi'an 710077, China;
Group of the Building Energy and
Sustainability Technology,
School of Human Settlements
and Civil Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: chaiyue@stu.xjtu.edu.cn

W. Tian, J. Tian, S. Dang

China United Northwest Institute for Engineering
Design & Research Co. Ltd,
Xi'an 710077, China

L. W. Jin, X. Z. Meng

Group of the Building Energy and
Sustainability Technology,
School of Human Settlements
and Civil Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received February 28, 2018; final manuscript received August 16, 2018; published online October 23, 2018. Assoc. Editor: Wei Li.

J. Thermal Sci. Eng. Appl 11(1), 011018 (Oct 23, 2018) (7 pages) Paper No: TSEA-18-1109; doi: 10.1115/1.4041442 History: Received February 28, 2018; Revised August 16, 2018

In recent years, a primary concern in the development of electronic technology is high heat dissipation of power devices. The advantages of unique thermal physical properties of graphite foam raise up the possibility of developing pool boiling system with better heat transfer efficiency. A compact thermosyphon was developed with graphite foam insertions to explore how different parameters affect boiling performance. Heater wall temperature, superheat, departure frequency of bubbles, and thermal resistance of the system were analyzed. The results indicated that the boiling performance is affected significantly by thermal conductivity and pore diameter of graphite foam. A proposed heat transfer empirical correlation reflecting the relations between graphite foam micro structures and pool boiling performance of Novec7100 was developed in this paper.

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Figures

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Fig. 6

Four types of graphite foam samples

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Fig. 5

Scanning electron microscope image of (a) Poco HTC and (b) Kfoam P1

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Fig. 4

Schematic diagram of designed thermosyphon system

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Fig. 3

Photograph of the evaporator chamber

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Fig. 2

Experimental setup and measurement system

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Fig. 12

Effect of foam types on heat transfer coefficients

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Fig. 13

Comparison of overall thermal resistances between different graphite foams

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Fig. 7

Captured boiling images of Kfoam P1 for different heat fluxes: (a) 3.2 W/cm2, (b) 4.4 W/cm2, (c) 7.8 W/cm2, (d) 10.21 W/cm2, (e) 13.21 W/cm2, and (f) 16.6 W/cm2

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Fig. 8

(a) Heater wall temperature and (b) superheat for different graphite foams in Novec7100

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Fig. 9

Temperature difference between the bottom and top surfaces of Kfoam P1

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Fig. 1

Scanning electron microscope image of typical graphite foam

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Fig. 10

Bubble departure diameter on the top and bottom surfaces of Kfoam P1

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Fig. 11

Bubble departure frequency on the top surface of Kfoam P1

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Fig. 14

Correlation of Novec7100 boiling from graphite foams

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