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Research Papers

Heat Transfer Characteristics in a Rotating Pin Finned Duct With Different Protrusion Locations

[+] Author and Article Information
Wei Du

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: hitdw9211@outlook.com

Lei Luo

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

Songtao Wang

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: 736899318@qq.com

Shaokang Bi

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: hitbsk@163.com

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
e-mail: 513569992@qq.com

1Both authors contributed equally to this work.

2Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received December 12, 2018; final manuscript received March 6, 2019; published online May 13, 2019. Assoc. Editor: Aaron P. Wemhoff.

J. Thermal Sci. Eng. Appl 11(6), 061009 (May 13, 2019) (15 pages) Paper No: TSEA-18-1665; doi: 10.1115/1.4043262 History: Received December 12, 2018; Accepted March 08, 2019

The heat transfer in a pin finned duct is augmented by the protrusion in this study. The realizable k–ε turbulence model coupled with the enhanced wall function is used to obtain the flow structure and heat transfer characteristics. Six different rotational numbers (Ro = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) and three different protrusion locations have been introduced. The pin fins and protrusions are placed on a simplified three-dimensional rectangular duct. Numerical results reveal that the Nusselt number in the pin finned channel has remarkable increase after adoption of the protrusions. In addition, the protrusion location and the rotational number have significant influence on the heat transfer distribution. The high rotational number is in favor of heat transfer enhancement on the endwall surface. Furthermore, the highest Nusselt number is occurred where protrusion is near the pin fin windward side.

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Figures

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Fig. 1

Temperature distribution in the turbine blade

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Fig. 2

A schematic diagram of the geometric model: (a) overall of the geometrical model and (b) parameter of the protrusion and pin fin

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Fig. 3

A comparison of the numerical results and experimental results: (a) stator duct, (b) low Coriolis force duct, and (c) high Coriolis force duct

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Fig. 4

Mesh in the flow domain: (a) a comparison of the Nu/Nu0 distribution along the centerline in streamwise and (b) a mesh of computational domain in this study

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Fig. 5

A comparison of the area-averaged Nusselt number and the wall shear integral

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Fig. 6

A comparison of the limiting streamline on the endwall surface at Ro = 0, 0.2, 0.6, and 0.8

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Fig. 7

A comparison of the streamline distributions on the middle plane between Ro = 0, 0.2, 0.6, and 0.8

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Fig. 8

A comparison of the streamline and relative velocity distributions at the plane, which is perpendicular to the direction of flow, between Ro = 0, 0.2, 0.6, and 0.8

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Fig. 9

A comparison of the dissipative function on the middle plane between Ro = 0, 0.2, 0.6, and 0.8

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Fig. 10

A comparison of the Nusselt number distributions on the endwall surface between Ro = 0, 0.2, 0.6, and 0.8

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Fig. 11

A comparison of the limiting streamline distributions and wall shear on the endwall surface between baseline, case 1, case 2, and case 3 at Ro = 0.4

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Fig. 12

A comparison of the streamline on the middle plane between baseline, case 1, case 2, and case 2 at Ro = 0.4

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Fig. 13

A comparison of the dissipative function distributions on the middle plane between baseline, case 1, case 2, and case 3 at Re = 0.4

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Fig. 14

A comparison of the TKE distributions on the middle plane between baseline, case 1, case 2, and case 3 at Re = 0.4

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Fig. 15

A comparison of the Nusselt number distributions on the endwall surface between baseline, case 1, case 2, and case 3 at Ro = 0.4

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Fig. 16

A comparison of the Nusselt number distributions and wall shear stress between the protrusions and dimples [31]: (a) Nusselt number on the leading side, (b) Nusselt number on the trailing side, (c) wall shear stress on the leading side, and (d) wall shear stress on the trailing side

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