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Research Papers

Flow and Heat Transfer Characteristics in Latticework Cooling Channels With Dimple Vortex Generators

[+] Author and Article Information
Yu Rao

e-mail: yurao@sjtu.edu.cn

Shusheng Zang

Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received June 26, 2013; final manuscript received July 14, 2013; published online October 15, 2013. Editor: Ronald Bunker.

J. Turbomach 136(2), 021017 (Oct 15, 2013) (10 pages) Paper No: TURBO-13-1108; doi: 10.1115/1.4025197 History: Received June 26, 2013; Revised July 14, 2013

A comparative experimental and numerical study has been conducted on the flow and heat transfer characteristics in a latticework cooling channel with U-shaped subchannels combined with dimple vortex generators over the Reynolds number range of 7700–36,985. The average Nusselt number and friction factor of the latticework channel have been obtained. The comparisons between the experimental and numerical data have shown that the numerical computation model can reasonably well predict the heat transfer and pressure loss in the latticework cooling channels. Additional numerical computations were further performed to investigate the effects of subchannel configurations on the flow and heat transfer in the latticework channel, and three different subchannel configurations were studied, which are the dimpled U subchannel, U subchannel, and rectangular subchannel. The experimental data of the heat transfer and pressure loss of the latticework channel with dimpled U subchannels have also been compared with those of the ribbed channels and pin fin channel from the literature. The present study indicated that the superior heat transfer enhancement capability of the latticework cooling is mainly due to the remarkably increased heat transfer area, turning effects producing strong vortical flow in the subchannels, and the interactions between the flow in the crossing subchannels, as well as the interactions between the flow and the crossing ribs on the opposite side.

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References

Figures

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Fig. 1

Schematics of the flow in the latticework cooling test section

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Fig. 2

Parameters of the latticework cooling subchannels

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Fig. 3

Geometrical dimensions of the latticework cooling test plate

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Fig. 4

Thermocouple locations on the back surface of the test plate

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Fig. 5

Experimental system for the latticework cooling

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Fig. 6

Schematic of boundary conditions in the computations

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Fig. 7

Latticework cooling models with rectangular and U subchannels

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Fig. 8

The mesh in the flow in the subchannels

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Fig. 9

Comparison of the experimental and numerical data of average Nusselt number

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Fig. 10

Comparison of the experimental and numerical data of friction factor

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Fig. 11

Average Nusselt numbers of latticework cooling with different subchannels

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Fig. 12

Friction factors of latticework cooling with different subchannels

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Fig. 13

Overall thermal performance of latticework channel with different subchannels

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Fig. 14

Streamlines in the subchannels in the latticework cooling at Re = 36,985

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Fig. 15

Velocity vectors in the intersecting top and bottom subchannels at Re = 36,985

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Fig. 16

Local heat transfer enhancement on the ribs in the latticework channel at Re = 36,985

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Fig. 17

Streamlines and local heat transfer enhancement in the turning region at Re = 36,985

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Fig. 18

Local heat transfer enhancement on the bottom surface in the different subchannels at Re = 36,985

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Fig. 19

Comparisons of the wetted area–averaged heat transfer enhancement in different cooling channels

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Fig. 20

Comparisons of the total heat transfer enhancement of different cooling channels

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Fig. 21

Comparisons of the friction factor ratio of different cooling channels

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Fig. 22

Comparisons of the overall thermal performance based on the wetted area–averaged Nusselt number enhancement

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Fig. 23

Comparisons of the overall thermal performance based on the total Nusselt number enhancement

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