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Research Papers: Heat Transfer Enhancement

Optimization of Pin-Fins for a Heat Exchanger by Entropy Generation Minimization and Constructal Law

[+] Author and Article Information
Gongnan Xie

Engineering Simulation
and Aerospace Computing (ESAC),
School of Mechanical Engineering,
Northwestern Polytechnical University,
P.O. Box 552,
Xi'an 710072, Shaanxi, China
e-mail: xgn@nwpu.edu.cn

Yidan Song

Engineering Simulation
and Aerospace Computing (ESAC),
School of Mechanical Engineering,
Northwestern Polytechnical University,
P.O. Box 552,
Xi'an 710072, Shaanxi, China

Masoud Asadi

Department of Mechanical Engineering,
Azad Islamic University Science and
Research Branch,
Tehran 1615918683, Iran
e-mail: masoud2471@gmail.com

Giulio Lorenzini

Full Professor
Department of Industrial Engineering,
University of Parma,
Parco Area delle Scienze, 181A,
Parma 43124, Italy

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 22, 2014; final manuscript received June 25, 2014; published online March 17, 2015. Assoc. Editor: Cesare Biserni.

J. Heat Transfer 137(6), 061901 (Jun 01, 2015) (9 pages) Paper No: HT-14-1145; doi: 10.1115/1.4029851 History: Received March 22, 2014; Revised June 25, 2014; Online March 17, 2015

Pin-fins are considered as one of the best elements for heat transfer enhancement in heat exchangers. In this study, the topology of pin-fins (length, diameter, and shape) is optimized based on the entropy generation minimization (EGM) theory coupled with the constructal law (CL). Such pin-fins are employed in a heat exchanger in a sensible thermal energy storage (TES) system so as to enhance the rate of heat transfer. First, the EGM method is used to obtain the optimal length of pin-fins, and then the CL is applied to get the optimal diameter and shape of pin-fins. Reliable computational fluid dynamics (CFD) simulations of various constructal pin-fin models are performed, and detailed flow and heat transfer characteristics are presented. The results show that by using the proposed system with optimized pin-fin heat exchanger the stored thermal energy can be increased by 10.2%.

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References

Figures

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Fig. 1

Schematic of TES system connected to the cooling system of the engine

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Fig. 2

Two rows with unequal pin-fins

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Fig. 3

A comparison between analytical results and CFD simulation for temperature distribution

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Fig. 4

Global thermal resistance: (a) D1/D2 = 0.7, (b) D1/D2 = 0.8, (c) D1/D2 = 0.9, (d) D1/D2 = 1.0, and (e) D1/D2 = 1.1

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Fig. 5

Streamlines for (a) D1/D2 = 1.1, S/W = 0.06, and H/D = 0.11; (b) D1/D2 = 1.1, S/W = 0.06, and H/D = 0.12; and (c) D1/D2 = 1.1, S/W = 0.06, and H/D = 0.13

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Fig. 6

Streamlines for D1/D2 = 1.1, S/W = 0.06, and H/D = 0.12: (a) Re = 10; (b) Re = 50; (c) Re = 100; and (d) Re = 200

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Fig. 7

Pressure contours for (a) D1/D2 = 1.1, S/W = 0.06, and H/D = 0.11; (b) D1/D2 = 1.1, S/W = 0.06, and H/D = 0.12; and (c) D1/D2 = 1.1, S/W = 0.06, and H/D = 0.13

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Fig. 8

Effect of the spanwise spacing on the Nusselt number: (a) D1/D2 = 0.7, (b) D1/D2 = 0.8, (c) D1/D2 = 0.9, (d) D1/D2 = 1.0, and (e) D1/D2 = 1.1

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