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TECHNICAL PAPERS: Forced Convection

Spatially Resolved Surface Heat Transfer for Parallel Rib Turbulators With 45 Deg Orientations Including Test Surface Conduction Analysis

[+] Author and Article Information
S. Y. Won, N. K. Burgess, S. Peddicord, P. M. Ligrani

Convective Heat Transfer Laboratory, Department of Mechanical Engineering, MEB 2110, University of Utah, Salt Lake City, UT 84112-9208, USA

J. Heat Transfer 126(2), 193-201 (May 04, 2004) (9 pages) doi:10.1115/1.1668046 History: Received June 06, 2003; Revised December 23, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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Figures

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Schematic diagrams of (a) the experimental apparatus used for heat transfer measurements, and (b) the rib turbulator test surfaces, including coordinate system
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Local Nusselt number ratio Nu/Nuo distribution along the rib turbulator test surface for ReH=17,000 and Toi/Tw=0.94. (a) With constant surface heat flux and no surface conduction analysis applied. (b) With variable surface heat flux and surface conduction analysis applied.
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Variable surface heat flux, local Nusselt number ratios Nu/Nuo along the rib turbulator test surface for a Reynolds number ReH=17,000 and Toi/Tw of 0.94. Data are given for constant surface heat flux (no surface conduction analysis) and for variable surface heat flux (with surface conduction analysis). (a) At constant Z/Dh=0.0 as X/Dh varies. (b) At constant X/Dh=7.0 as Z/Dh varies.
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Variable surface heat flux, local Nusselt number ratios Nu/Nuo along the rib turbulator test surface for different Reynolds numbers ReH and Toi/Tw of 0.93–0.95. (a) At constant Z/Dh=0.0 as X/Dh varies. (b) At constant X/Dh=7.0 as Z/Dh varies.
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(a) Schematic diagram of a portion of the bottom rib turbulator test surface showing the coordinates which are oriented perpendicular to and parallel to the rib turbulators. (b) (c) Nusselt number ratios N̄u/Nuo, obtained with variable surface heat flux, for fully-developed conditions measured at the downstream end of the test section for different Reynolds numbers and Toi/Tw=0.93–0.95. (b) Data averaged in the L/Dh direction, as dependent upon the W/Dh/(W/Dh)max coordinate. (c) Data averaged in the W/Dh direction, as dependent upon the L/Dh/(L/Dh)max coordinate.
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Nusselt number ratios N̄u/Nuo for fully-developed conditions measured at the downstream end of the test section for a Reynolds number number ReH=17,000 and Toi/Tw of 0.94. Data are shown with and without conduction analysis applied (variable and constant surface heat flux, respectively). (a) Data averaged in the L/Dh direction, as dependent upon the W/Dh/(W/Dh)max coordinate. (b) Data averaged in the W/Dh direction, as dependent upon the L/Dh(L/Dh)max coordinate.
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Nusselt number ratios N̄u/Nuo, obtained with variable surface heat flux, for a Reynolds number number ReH=51,000 and Toi/Tw of 0.94. Data are shown which are measured at the downstream end of the test section with thermally fully-developed flow, and measured at the upstream end of the test section with thermally developing flow. (a) Data averaged in the L/Dh direction, as dependent upon the W/Dh/(W/Dh)max coordinate. (b) Data averaged in the W/Dh direction, as dependent upon the L/Dh/(L/Dh)max coordinate.
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Parallel-rib-turbulator channel globally averaged Nusselt number ratios for fully developed flow, averaged over the surface area corresponding to one period of rib turbulator geometry, as dependent upon Reynolds number for Toi/Tw=0.93–0.95. Comparisons with results from other investigations 567 are included.
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Rib turbulator channel friction factor ratios f/fo for fully developed flow conditions as dependent upon Reynolds number for Toi/Tw=0.93–0.95. Symbols are defined in Fig. 8. Comparisons with results from other investigations 567 are included.
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Rib turbulator channel globally-averaged Nusselt numbers for fully developed flow and Toi/Tw=0.93–0.95 as dependent upon friction factor ratios, including comparisons with results from other investigations 567. Symbols are defined in Fig. 8.
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Rib turbulator channel globally averaged performance parameters for fully developed flow and Toi/Tw=0.93–0.95 as dependent upon Reynolds number, including comparisons with results from other investigations 567. Symbols defined in Fig. 8.

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