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Research Papers: Heat Transfer Enhancement

Investigations on the Condensation Heat Transfer Performance of Stainless Steel Edge-Shaped Finned Tubes

[+] Author and Article Information
Zhen-ping Wan, Yong Tang

Key Laboratory of Surface Functional
Structure Manufacturing of Guangdong
Higher Education Institutes,
South China University of Technology,
Guangzhou 510640, China

Xiao-wu Wang

Department of Physics,
School of Science,
South China University of Technology,
Guangzhou 510640, China
e-mail: jouney5@163.com

Xiao-xia Zhang

Mechatronics Department,
Guangdong AIB Polytechnic College,
Guangzhou 510507, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 13, 2014; final manuscript received October 12, 2015; published online November 24, 2015. Assoc. Editor: Sujoy Kumar Saha.

J. Heat Transfer 138(3), 031902 (Nov 24, 2015) (7 pages) Paper No: HT-14-1308; doi: 10.1115/1.4031920 History: Received May 13, 2014; Revised October 12, 2015

The third-generation enhanced heat transfer technologies, such as three-dimensional fin and dimple, are still important means of improving energy efficiency. This paper analyzes the condensation heat transfer performances of three edge-shaped finned tubes that were fabricated using the plowing–extruding process. Experimental results show that the shell-side heat transfer coefficient decreases with increases of heat flux and temperature difference between wall and vapor. The edge-shaped finned tubes exhibit better heat transfer performance than smooth tubes. At the identical temperature difference between the wall and the vapor, the shell-side heat transfer coefficient of the edge-shaped finned tubes is approximately 1.7–2.6 times larger than that of the smooth tubes. At the identical temperature difference between the wall and the vapor, the shell-side heat transfer coefficient of edge-shaped finned tubes is also higher than the reported value in the literature. The excellent performance of the edge-shaped finned tubes comes from the coordination of enhancement from the three-dimensional fins, dimples, and grooves. Finned tubes with grooves fabricated along the left direction have higher and thinner fins and therefore show better heat transfer performance. The shell-side heat transfer coefficients of edge-shaped finned tubes increase with plowing–extruding depth and feed increasing.

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Figures

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Fig. 1

Micrographs of the fin, dimple, and groove in the tube fabricated using the plowing–extruding process: (a) three-dimensional fins and (b) grooves and dimples

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Fig. 2

Fabrication process for the edge-shaped finned tube: (a) two-dimensional fins fabricated in the first rolling step, (b) plowing–extruding process, and (c) tool

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Fig. 3

Schematic diagram of the heat transfer performance experiment: 1, computer; 2, hot water bulk; 3, resistor rod; 4, temperature controller; 5, valve; 6, hot water pump; 7, rotameter; 8, K-type thermocouple; 9, evaporator; 10, normal two-dimensional finned tube; 11, valve; 12, valve; 13, condenser; 14, three-dimensional edge-shaped finned tube; 15, pressure gauge; 16, cold water pump; and 17, cold water bulk

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Fig. 4

Results of the heat transfer performance of the edge-shaped finned tubes and the smooth tubes: (a) overall heat transfer coefficient versus heat flux, (b) shell heat transfer coefficient versus heat flux, and (c) shell heat transfer coefficient versus temperature difference of the wall

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Fig. 5

Influence of fabrication parameters on fin height: (a) fin height versus feed and (b) fin height versus plowing–extruding depth

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