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Technical Brief

Flow Structure and Heat Transfer Characteristics of a Rectangular Channel With Pin Fins and Dimples With Different Shapes

[+] Author and Article Information
Lei Luo

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: Leiluo@hit.edu.cn

Han Yan, Wei Du, Songtao Wang

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China

Changhai Li

Department of Technique,
Harbin Marine Boiler and Turbine Research Institute,
Harbin 150078, China

Xinghong Zhang

National Key Laboratory of Science and Technology on
Advanced Composites in Special Environments Center for
Composite Materials and Structure,
Harbin Institute of Technology,
Harbin 150001, China

1Corresponding author.

2L. Luo, H. Yan, and W. Du contributed equally to this work.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 30, 2018; final manuscript received September 16, 2018; published online November 5, 2018. Assoc. Editor: Cheng-Xian Lin.

J. Thermal Sci. Eng. Appl 11(2), 024501 (Nov 05, 2018) (10 pages) Paper No: TSEA-18-1162; doi: 10.1115/1.4041598 History: Received March 30, 2018; Revised September 16, 2018

In this study, numerical simulations are conducted to investigate the effects of pin fin and dimple shape on the flow structure and heat transfer characteristics in a rectangular channel. The studied shapes for dimple and pin fin are circular, spanwise-elliptical, and streamwise-elliptical, respectively. The flow structure, friction factor, and heat transfer performance are obtained and analyzed with Reynolds number ranging from 10,000 to 50,000. Channel with circular pin fin and dimple is chosen as the Baseline. Channels with spanwise-elliptical pin fins have the best heat transfer augmentation, while also accompanied with the largest friction factor. Spanwise-elliptical pin fin generates the strongest horseshoe vortex which is responsible for the best heat transfer augmentation. Besides, channels with streamwise-elliptical pin fins show the worst heat transfer augmentation and the smallest friction factors. Dimple plays an important role in improving the heat transfer. Spanwise-elliptical dimple yields the best heat transfer augmentation which is attributed to the strongest counter-rotating vortex, while streamwise-elliptical dimple shows the worst heat transfer enhancement.

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Figures

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Fig. 4

Comparison of the CFD results and experimental results

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Fig. 3

Schematic of all the cases investigated

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Fig. 2

Schematic of the geometrical configuration of the dimple-pin fin channel and the dimple

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Fig. 1

Schematic of the computational model

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Fig. 11

Comparison of the overall thermal performance of the whole channel for Re ranging from 10,000 to 50,000

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Fig. 6

Comparison of the vortex strength distribution along the streamwise direction at Re = 30,000

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Fig. 7

Comparison of the TKE distribution at streamwise central cross section at Re = 30,000

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Fig. 8

Comparison of the local Nusselt number distribution at the dimpled endwall at Re = 30,000

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Fig. 9

Comparison of the area-averaged Nusselt number at the endwall surface for Re ranging from 10,000 to 50,000

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Fig. 10

Comparison of the friction factor of the whole channel for Re ranging from 10,000 to 50,000

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Fig. 12

Comparison of the thermal performance with other sources

Tables

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