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Research Papers: Heat Transfer Enhancement

An Experimental and Numerical Study of Flow and Heat Transfer in Channels With Pin Fin-Dimple Combined Arrays of Different Configurations

[+] Author and Article Information
Yu Rao

e-mail: yurao@sjtu.edu.cn

Shusheng Zang

Institute of Turbomachinery,
Department Mechanical and
Power Engineering,
Shanghai Jiaotong University,
Dongchuan Road 800,
Shanghai 200240, P.R. China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 19, 2012; final manuscript received May 20, 2012; published online October 5, 2012. Assoc. Editor: P. M. Ligrani.

J. Heat Transfer 134(12), 121901 (Dec 05, 2012) (11 pages) doi:10.1115/1.4006943 History: Received January 19, 2012; Revised May 20, 2012

An experimental and numerical study was conducted to investigate the flow and heat transfer characteristics in channels with pin fin-dimple combined arrays of different configurations, where dimples are located transversely or both transversely and streamwisely between the pin fins. The flow structure, friction factor, and heat transfer characteristics of the pin fin-dimple channels of different configurations have been obtained and compared with each other for the Reynolds number range of 8200–50,500. The experimental study showed that, compared to the pin fin channel, depending on the configurations of the pin fin-dimple combined arrays the pin fin-dimple channel can have distinctively further improved convective heat transfer performance by 8.0%–20.0%, whereas lower or slightly higher friction factors over the studied Reynolds number range. Furthermore, three-dimensional and steady-state conjugate computations have been carried out for similar experimental conditions. The numerical computations showed detailed characteristics of the distribution of the velocity and turbulence level in the flow, which revealed the underlying mechanisms for the pressure loss and heat transfer characteristics in the pin fin-dimple channels of different configurations.

Copyright © 2012 by ASME
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Figures

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Fig. 1

Schematic diagram of the experimental system

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Fig. 2

Geometrical configurations of the pin fin-dimple channels of different configurations

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Fig. 3

Schematic of the boundary conditions for the computations for pin fin-dimple channels of different configurations

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Fig. 4

The mesh in the flow region in the 1# pin fin-dimple channel

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Fig. 5

Comparisons of the three-dimensional streamlines in the pin fin-dimple channels at Re = 50,500

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Fig. 6

Comparisons of the streamwise velocity contour in the minimum cross section transversely between the pin fins in the pin fin-dimple channels at Re = 50,500

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Fig. 7

Comparisons of the streamlines in the minimum cross section transversely between the pin fins in the pin fin-dimple channels at Re = 50,500

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Fig. 8

Comparisons of the turbulent kinetic energy distribution in the minimum cross section transversely between the pin fins in the pin fin-dimple channels at Re = 50,500

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Fig. 9

Comparisons of the streamwise velocity in a plane with a distance of 0.5 mm away from the endwall in the pin fin-dimple channels at Re = 50,500

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Fig. 10

Comparisons of the streamlines in a plane with a distance of 0.5 mm away from the endwall in the pin fin-dimple channels at Re = 50,500

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Fig. 11

Comparisons of turbulent kinetic energy distribution in a plane with a distance of 0.5 mm away from the endwall in the pin fin-dimple channels at Re = 50,500

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Fig. 12

Comparisons of the turbulent kinetic energy distribution in the longitudinal central plane in the pin fin-dimple channels at Re = 50,500

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Fig. 13

Comparisons of friction factors versus Reynolds number in the pin fin-dimple channels

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Fig. 14

Comparisons of area averaged Nusselt numbers versus Reynolds number in the pin fin-dimple channels

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Fig. 15

Comparisons of local Nusselt numbers on the endwall in the pin fin-dimple channels at Re = 50,500

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Fig. 16

Comparisons of temperature contours on the endwall in the pin fin-dimple channels at Re = 50,500

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Fig. 17

Comparisons of the overall thermal performance parameters in the pin fin-dimple channels

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