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Research Papers: Heat Exchangers

Experimental Study on Heat Transfer Performances of Flat Tube Bank Fin Heat Exchanger Using Four Different Fin Patterns

[+] Author and Article Information
Feng-Cai Zheng, Song Liu, Zhi-Min Lin, Jaafar Nugud, Li-Min Chang

School of Mechanical Engineering,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Key Laboratory of Railway Vehicle
Thermal Engineering of MOE,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China

Liang-Chen Wang

Key Laboratory of Railway Vehicle
Thermal Engineering of MOE,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
School of Chemistry and Chemical
Engineering Science,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China

Liang-Bi Wang

School of Mechanical Engineering,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Key Laboratory of Railway Vehicle
Thermal Engineering of MOE,
School of Mechanical Engineering,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China
e-mail: lbwang@mail.lzjtu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 2, 2016; final manuscript received September 8, 2017; published online January 10, 2018. Assoc. Editor: Debjyoti Banerjee.

J. Heat Transfer 140(4), 041801 (Jan 10, 2018) (8 pages) Paper No: HT-16-1486; doi: 10.1115/1.4038419 History: Received August 02, 2016; Revised September 08, 2017

Air-side heat transfer and flow friction characteristics of four different fin patterns suitable for flat tube bank fin heat exchangers are investigated experimentally. The fin patterns are the fin with six dimples, the fin with nine dimples, the double louvered fin, and the fin with delta-winglet vortex generators (VGs). The corresponding plain fins (plain fin I and plain fin II) are used as the references for evaluating the thermal performances of these fin patterns under identical pump power constraint. The performance of the fin with the six dimples is better than that with nine dimples. The performance of the fin with delta-winglet VGs is better than that of the double louvered fin, and the performance of the latter is better than that of the fins with six or nine dimples. In the tested Reynolds number range, the heat transfer enhancement performance factor of the fin with six dimples, the fin with nine dimples, the double louvered fin, and the fin with delta-winglet VGs is 1.2–1.3, 1.1–1.2, 1.3–1.6, and 1.4–1.6, respectively. The correlations of Nusselt number and friction factor with Reynolds number for the fins with six/nine dimples and the double louvered fin are obtained. These correlations are useful to design flat tube bank fin heat exchangers.

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Figures

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Fig. 2

Schematic view of the fin patterns and their geometrical parameters: (a) the fin with six dimples, (b) the fin with nine dimples, (c) the double louvered fin, and (d) the fin with delta-winglet VGs

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Fig. 1

Configurations of the real tube bank fin heat exchanger with different fin patterns: (a) configurations of the real heat exchanger, (b) the fin with six dimples, (c) the fin with nine dimples, (d) the double louvered fin, and (e) the fin with delta-winglet VGs

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Fig. 3

Validation of experimental results of the real circular tube bank plain fin heat exchanger: (a) Nua and (b) fa

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Fig. 4

Comparison of heat transfer performance of the fin patterns studied (the corresponding plain fins as the reference fins, respectively): (a) Nua and (b) fa

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Fig. 5

Comparison of JF of the fin patterns

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Fig. 6

The fitness of the correlations: (a) Nua and (b) fa

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