0
TECHNICAL PAPERS

Spatially Resolved Heat Transfer and Friction Factors in a Rectangular Channel With 45-Deg Angled Crossed-Rib Turbulators

[+] Author and Article Information
P. M. Ligrani, G. I. Mahmood

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

J. Turbomach 125(3), 575-584 (Aug 27, 2003) (10 pages) doi:10.1115/1.1565353 History: Received October 24, 2001; Online August 27, 2003
Copyright © 2003 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Schematic diagrams of (a) the experimental apparatus used for heat transfer measurements, and (b) the experimental apparatus used for flow visualizations and measurements of flow structure
Grahic Jump Location
Schematic diagram of the rib turbulator test surfaces, including coordinate system
Grahic Jump Location
Baseline Nusselt numbers, measured with smooth channel surfaces and constant heat flux boundary condition, as dependent upon Reynolds number based on hydraulic diameter
Grahic Jump Location
Local Nusselt number ratio Nu/Nuo distribution along the rib turbulator test surface for ReH=48,000 and Toi/Tw=0.94, with constant surface heat flux and no surface conduction analysis applied
Grahic Jump Location
Local Nusselt number ratio Nu/Nuo distribution along the rib turbulator test surface for ReH=48,000 and Toi/Tw=0.94, for variable surface heat flux and surface conduction analysis applied
Grahic Jump Location
Constant heat flux local Nusselt number ratios Nu/Nuo along the rib turbulator test surface at Z/Dh=0.0 for different Reynolds numbers ReH and Toi/Tw of 0.93–0.95. No conduction analysis applied.
Grahic Jump Location
Constant heat flux local Nusselt number ratios Nu/Nuo along the rib turbulator test surface at X/Dh=6.90 for different Reynolds numbers ReH and Toi/Tw of 0.93–0.95. No conduction analysis applied. Symbols are defined in Fig. 6.
Grahic Jump Location
Local Nusselt number ratios Nu/Nuo along the rib turbulator test surface at Z/Dh=0.11 for a Reynolds number ReH=48,000 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).
Grahic Jump Location
Local Nusselt number ratios Nu/Nuo along the rib turbulator test surface at X/Dh=6.90 for a Reynolds number ReH=48,000 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).
Grahic Jump Location
Schematic diagram of a portion of the bottom rib turbulator test surface showing the orientations and layout of several rib turbulators, and the coordinates W/Dh and L/Dh, which are oriented perpendicular to and parallel to the rib turbulators, respectively
Grahic Jump Location
Nusselt number ratios N̄u/Nuo, for fully developed conditions measured at the downstream end of the test section and averaged in the W/Dh direction, as dependent upon the L/Dh coordinate for different Reynolds numbers and Toi/Tw=0.93–0.95. Symbols are defined in Fig. 12. Surface heat flux is constant and no surface conduction analysis is applied.
Grahic Jump Location
Nusselt number ratios N̄u/Nuo, for fully developed conditions measured at the downstream end of the test section and averaged in the L/Dh direction, as dependent upon the W/Dh coordinate for different Reynolds numbers and Toi/Tw=0.93–0.95. Surface heat flux is constant and no surface conduction analysis is applied.
Grahic Jump Location
Nusselt number ratios N̄u/Nuo, for fully developed conditions measured at the downstream end of the test section and averaged in the L/Dh direction, as dependent upon the W/Dh coordinate for a Reynolds number ReH=48,000 and Toi/Tw of 0.94. Data are shown with and without conduction analysis applied (variable and constant surface heat flux respectively).
Grahic Jump Location
Nusselt number ratios N̄u/Nuo, for thermally developing flow measured at the upstream end of the test section and averaged in the W/Dh direction, as dependent upon the L/Dh coordinate for ReH=53,500 and Toi/Tw=0.93–0.95.
Grahic Jump Location
Nusselt number ratios N̄u/Nuo, for thermally developing flow measured at the upstream end of the test section and averaged in the L/Dh direction, as dependent upon the W/Dh coordinate for ReH=53,500 and Toi/Tw=0.93–0.95. Surface heat flux is constant and no surface conduction analysis is applied.
Grahic Jump Location
Rib turbulator channel globally averaged Nusselt number ratios for fully developed flow, averaged over the surface area corresponding to one period of rib turbulator surface geometry. Comparisons with results from other investigations 345 are included.
Grahic Jump Location
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. 16. Comparisons with results from other investigations 345 are included.
Grahic Jump Location
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 345. Symbols are defined in Fig. 16.
Grahic Jump Location
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 345. Symbols defined in Fig. 16.

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In