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TECHNICAL PAPERS: Forced Convection

Nusselt Number Behavior on Deep Dimpled Surfaces Within a Channel

[+] Author and Article Information
N. K. Burgess, M. M. Oliveira, P. M. Ligrani

Convective Heat Transfer Laboratory, Department of Mechanical Engineering, MEB 2202, 50 S. Central Campus Drive, University of Utah, Salt Lake City, UT 84112-9208

J. Heat Transfer 125(1), 11-18 (Jan 29, 2003) (8 pages) doi:10.1115/1.1527904 History: Received April 29, 2002; Revised September 13, 2002; Online January 29, 2003
Copyright © 2003 by ASME
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Figures

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Schematic diagram of the experimental apparatus used for heat transfer measurements
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Schematic diagrams of the top and bottom dimpled test surfaces. All dimensions are given in cm.
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Schematic diagrams of individual dimple geometry details for the present study and for Mahmood et al. 1. All dimensions are given in cm.
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Baseline, constant property Nusselt numbers, measured with smooth channel surfaces and constant heat flux boundary condition, for a ratio of inlet stagnation temperature to surface temperature of 0.93–0.94, as dependent upon Reynolds number based on hydraulic diameter. Data are given for all four walls heated, and for one wall heated.
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Local Nusselt number ratio data from a channel with dimples and heating on one channel surface, for δ/D=0.2,H/D=1, and ReH=20,000 from Mahmood 15
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Local Nusselt number ratio data from a channel with dimples on one channel surface, and heating on one channel surface, for δ/D=0.3,H/D=1, and ReH=17,200
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Local dimpled channel Nusselt number ratios as dependent upon X/D along the spanwise centerline at Z/D=0. Data are given for δ/D=0.3,H/D=1, and ReH=17,200 from the present study, and for δ/D=0.2,H/D=1, and ReH=20,000 from Mahmood 15.
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Local dimpled channel Nusselt number ratios as dependent upon X/D along the spanwise centerline at Z/D=0 for δ/D=0.3,H/D=1, and different ReH from the present study
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Local dimpled channel Nusselt number ratios as dependent upon Z/D along a line at X/D=23.2 for δ/D=0.3,H/D=1, and different ReH from the present study
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Spanwise-averaged dimpled channel Nusselt number ratios as dependent upon X/D for δ/D=0.3,H/D=1, and ReH=17,200 from the present study, and for δ/D=0.2,H/D=1, and ReH=20,000 from Mahmood 15
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Spanwise-averaged dimpled channel Nusselt number ratios as dependent upon X/D for δ/D=0.3,H/D=1, and different ReH from the present study
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Streamwise-averaged dimpled channel Nusselt number ratios as dependent upon Z/D for δ/D=0.3,H/D=1, and different ReH from the present study
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Globally-averaged dimpled channel Nusselt number ratios as dependent upon Reynolds number ReH for δ/D=0.3 and H/D=1. Results from the present study are compared to results from Mahmood 15, Chyu et al. 8, and Moon et al. 10 for different values of δ/D, the ratio of dimple depth to dimple print diameter.
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Dimpled channel friction ratio as dependent upon Reynolds number ReH for δ/D=0.3 and H/D=1. Results from the present study are compared to results from Mahmood 15, Chyu et al. 8, and Moon et al. 10 for different values of δ/D, the ratio of dimple depth to dimple print diameter. Symbols are defined in Fig. 13.

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