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TECHNICAL PAPERS

Local Heat Transfer and Flow Structure on and Above a Dimpled Surface in a Channel

[+] Author and Article Information
G. I. Mahmood, M. L. Hill, D. L. Nelson, P. M. Ligrani

  Convective Heat Transfer Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112

H.-K. Moon, B. Glezer

Solar Turbines, Inc., Turbine Cooling Design and Analysis, San Diego, CA 92186

J. Turbomach 123(1), 115-123 (Feb 01, 2000) (9 pages) doi:10.1115/1.1333694 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Schmeatic diagrams of (a) the experimental apparatus, and (b) a side view of the experimental apparatus with dimensions. All dimensions are given in mm.
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Schematic diagrams of: (a) the entire dimpled test surface, and (b) individual dimple geometry details. All dimensions are given in mm.
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Local Nu/Nu0 distributions measured at ReH=10.200 and Toi/Tw=0.94
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Sketch of three-dimensional flow structure and flow visualization images in different light planes at dimple row 10 for ReH=1250 and H/D=0.5
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Time sequence of flow visualization images in the spanwise-normal light plane at dimple row 10 for ReH=1250 and H/D=0.5: (a) t=0.0 s, t* =0.0, (b) t=0.033 s, t* =1.12, (c) t=0.067 s, t* =2,27, (d) t=0.100 s, t* =3.39, (d) t=0.133 s, t* =4.50, (f) t=0.167 s, t* =5.66
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Surveys of time-averaged quantities in a spanwise-normal plane at X/D=11.88, which is located 53.2 mm downstream of the last row of dimples on the test surface for ReH=9000:(a) total pressure (Pa−P̄0), adjacent contour lines are 2.0 Pa apart; (b) streamwise velocity , adjacent contour lines are 0.25 m/s apart; (c) schematic diagram of qualitative variations of large-scale, time-averaged secondary flow vectors
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Local Nu/Nu0 distributions measured at ReH=61,500 and Toi/Tw=0.92. Contour plot scale is given with Fig. 3.
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Local Nu/Nu0 distributions measured at ReH=13,300 and Toi/Tw=0.83. Contour plot scale is given with Fig. 3.
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Local Nu/Nu0 distributions measured at ReH=12,800 and Toi/Tw=0.68. Contour plot scale is given with Fig. 3.
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Local Nu/Nu0 as dependent upon X/D, measured at different ReH and Toi/Tw at the eleventh row of dimples along a line of constant Z/D of 0.89
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Local Nu/Nu0 as dependent upon Z/D, measured at different ReH and Toi/Tw at the eleventh row of dimples along a line of constant X/D of 8.46. Symbols defined in Fig. 10.
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Spanwise-averaged Nu/Nu0 as dependent upon X/D, measured at different ReH and Toi/Tw at the eleventh and twelfth rows of dimples. Symbols defined in Fig. 10.
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Streamwise-averaged Nu/Nu0 as dependent upon Z/D, measured at different ReH and Toi/Tw at the eleventh and twelfth rows of dimples. Symbols defined in Fig. 10.
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Globally averaged Nu/Nu0 as dependent upon temperature ratio Toi/Tw, measured at different ReH at the eleventh and twelfth rows of dimples

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