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Research Papers

Experimental and Computational Study of Heat/Mass Transfer and Flow Structure for Four Dimple Shapes in a Square Internal Passage

[+] Author and Article Information
Sumanta Acharya1

Fuguo Zhou

Mechanical Engineering Department, Turbine Innovation and Energy Research (TIER) Center,  Louisiana State University, Baton Rouge, LA 70803

1

Corresponding author.

J. Turbomach 134(6), 061028 (Sep 12, 2012) (13 pages) doi:10.1115/1.4006315 History: Received October 12, 2009; Revised August 05, 2011; Published September 12, 2012; Online September 12, 2012

Mass/heat transfer measurements are made using the naphthalene sublimation method in a square internal passage where one wall has a single dimple. Four types of dimple shapes are studied: square, triangular, circular, and teardrop. Sherwood numbers are obtained both inside and around the dimples. Measurements are made at a Reynolds number of 21,000. In addition, computations are performed for the same dimple geometries, and with the same flow conditions as in the experiments. Flow patterns for the four dimples are identified and heat transfer distributions for each dimple are obtained. The computational results are compared with the experimental data and show satisfactory agreement. Both the experimental and numerical results suggest that the teardrop dimple has the highest heat /mass transfer among the four dimple shapes studied.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 4

Spanwise average Nu/Nu0 and Sh/Sh0 in the wake of the four dimples

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Figure 5

Experimental Sh/Sh0 contours

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Figure 6

Comparisons of the spanwise average Sh/Sh0 in the wake of the four dimples

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Figure 7

Vorticity and streamlines in the XY, XZ, and YZ planes with square dimples

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Figure 8

Vorticity and streamlines in the XY, XZ, and YZ planes with triangular dimples

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Figure 11

Nu/Nu0 distributions of the square dimple

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Figure 12

Nu/Nu0 distributions of the triangular dimple

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Figure 15

Comparisons of the spanwise average Nu/Nu0 in the wake of the four dimples

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Figure 14

Nu/Nu0 distributions of the teardrop dimple

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Figure 13

Nu/Nu0 distributions of the circular dimple

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Figure 10

Vorticity and streamlines in the XY, XZ, and YZ planes with teardrop dimples

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Figure 9

Vorticity and streamlines in the XY, XZ, and YZ planes with circular dimples

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Figure 3

Geometries of the dimples

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Figure 2

Dimensions of the dimpled test wall

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Figure 1

Schematic of the (a) test facility, and (b) the two-pass test section (only one pass used in the present experiments)

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