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TECHNICAL PAPERS

Parametric Effects on Heat Transfer of Impingement on Dimpled Surface

[+] Author and Article Information
Koonlaya Kanokjaruvijit, Ricardo F. Martinez-Botas

Department of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, UK

J. Turbomach 127(2), 287-296 (May 05, 2005) (10 pages) doi:10.1115/1.1791292 History: Received October 01, 2003; Revised March 01, 2004; Online May 05, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic of experimental apparatus
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Dimple plate geometries. In (a) and (b) the black portions indicate the projection of the jet hole on the plate, the left hand figures are impingement on the dimple itself while the right hand is impingement on the flat portion between dimples. (c) shows a schematic diagram of the location of impingement
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Overall averaged Nusselt numbers of jet impingement on a flat surface, including results from the literature
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Normalized streamwise averaged Nusselt numbers at an H/Dj of 8, hemispherical dimples impinging on dimples (Phase 1, Table 1)
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Schematic of dimpled plate showing local locations with cross-sectional lines: (a–a), (b–b) and (c–c) represent the centerline of the plate (passing the center dimple which is staggered), tangential line and centerline of inline dimples in the streamwise direction, respectively, (a–a),(b–b),(c–c) in the spanwise direction (Phase 2, Table 1). Note that the center dimple is staggered and the rest are inline to the jet holes
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Comparisons of local streamwise Nusselt numbers at different locations from the schematic in Fig. 13
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Comparisons of local spanwise Nusselt numbers at different locations from the schematic in Fig. 14
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Overall heat transfer results of different dimple depths compared with those of the flat plate at H/Dj=2 and 4
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Contour plot of Nusselt numbers of a dimpled plate of 40 mm diameter and 10 mm depth (d/Dd=0.25) at Re=11500 (Phase 2, Table 1). Note that white rings represent dimple positions
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Contour plot of Nusselt numbers of a dimpled plate of 40 mm diameter and 6 mm depth (d/Dd=0.15) at Re=11500 (Phase 2, Table 1)
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Effect of the calculation method of taking into account areas of dimples and dimple edges, H/Dj=4
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Plenum pressure measurements compared to those of the flat surface at various H/Dj values (Phase 1, Table 1), ReDj=11500, Maximum crossflow scheme
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Surface pressure distribution across the dimpled plate, H/Dj=4,ReDj=11500,d/Dd=0.25, Maximum crossflow scheme
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Comparisons of overall averaged Nusselt numbers of both dimple geometries to those of a flat surface at Re=11500, Phase 1 in Table 1. (Figures courtesy of Kanokjaruvijit and Martinez-Botas 8)
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Plots of streamwise normalized average Nusselt numbers of both dimpled plates compared to those of flat surface (Phase 1, Table 1). (Figures courtesy of Kanokjaruvijit and Martinez-Botas 8)
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Comparisons of overall averaged Nusselt numbers of both impinging jet positions to those of the flat surface, maximum crossflow scheme (Figures courtesy of Kanokjaruvijit and Martinez-Botas 9). Note that Case 1 means jets impinging onto dimples and Case 2 on flat portions
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Spanwisewise averaged Nusselt numbers of different impinging jet positions on a cusped elliptical dimpled plate at H/Dj=8 and Re=11500. (Phase 1, Table 1)
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Spanwise averaged Nusselt numbers of different impinging jet positions on hemispherical dimpled plate H/Dj=8 and Re=11500 (Phase 1, Table 1)
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A comparison of normalized overall average Nusselt numbers at various Reynolds numbers of hemispherical dimples of 17.32 mm diameter
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Normalized streamwise average Nusselt numbers of hemispherical dimples at Re=8000 (Phase 1, Table 1). Note that the crossflow direction is from right to left).
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A comparison of normalized average Nusselt numbers at various jet-to-plate spacings, hemispherical dimples

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