0
TECHNICAL PAPERS: Forced Convection

Variable Property and Temperature Ratio Effects on Nusselt Numbers in a Rectangular Channel With 45 Deg Angled Rib Turbulators

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

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

J. Heat Transfer 125(5), 769-778 (Sep 23, 2003) (10 pages) doi:10.1115/1.1589503 History: Received March 26, 2002; Revised March 20, 2003; Online September 23, 2003
Copyright © 2003 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Ratios of variable-property (globally-averaged) rib-turbulator Nusselt numbers to constant-property (globally-averaged) rib turbulator Nusselt numbers Nu̿/Nu̿cp as dependent upon the temperature ratio Toi/Tw, for the present rib turbulator channel, and other heat transfer augmentation devices 918.
Grahic Jump Location
Ratios of variable-property, rib turbulator friction factors to constant-property, rib turbulator friction factors f/fcp as dependent upon temperature ratio Toi/Tw, for the present rib turbulator channel.
Grahic Jump Location
Rib turbulator channel thermal performance parameters as dependent upon Toi/Tw for ReH from 10,000 to 83,700, including comparisons with thermal performance parameter magnitudes produced by other heat transfer augmentation devices 918.
Grahic Jump Location
Schematic diagram of experimental apparatus used for heat transfer measurements.
Grahic Jump Location
Schematic diagram of the rib turbulator test surface, including the dimensions and coordinate system.
Grahic Jump Location
Baseline, constant property Nusselt numbers, measured with smooth channel surfaces and constant heat flux boundary condition on all channel surfaces for Toi/Tw=0.92–0.94, as dependent upon Reynolds number ReDh based on hydraulic diameter.
Grahic Jump Location
Baseline, variable property Nusselt number ratios in a smooth channel, measured with a constant heat flux boundary condition on all channel surfaces, as dependent upon temperature ratio Toi/Tw.
Grahic Jump Location
Time-averaged local Nusselt number ratio Nu/Nuo,cp distribution along the rib turbulator test surface for ReH=18,300 and Toi/Tw=0.93.
Grahic Jump Location
Time-averaged local Nusselt number ratio Nu/Nuo,cp distribution along the rib turbulator test surface for ReH=22,100 and Toi/Tw=0.82.Nu/Nuo,cp scale is same as one shown in Figure 5.
Grahic Jump Location
Time-averaged local Nusselt number ratio Nu/Nuo,cp distribution along the rib turbulator test surface for ReH=27,400 and Toi/Tw=0.74.Nu/Nuo,cp scale is same as one shown in Figure 5.
Grahic Jump Location
Local Nusselt number ratios Nu/Nuo,cp as they vary in the normalized streamwise direction at Z/Dh=0.00 for different temperature ratios Toi/Tw.
Grahic Jump Location
Local Nusselt number ratios Nu/Nuo,cp as they vary in the normalized spanwise direction at X/Dh=6.90 for different temperature ratios Toi/Tw. Symbols are defined in Figure 8.
Grahic Jump Location
Schematic diagram of a portion of the bottom rib turbulator test surface showing the layout of three ribs and the local coordinates W/Dh and L/Dh, which are oriented perpendicular and parallel to the ribs, respectively.
Grahic Jump Location
Spatially-averaged Nusselt number ratios Nu/Nuo,cp determined from averages in the W/Dh direction, as dependent upon the normalized L/Dh coordinate, for different values of Toi/Tw.
Grahic Jump Location
Spatially-averaged Nusselt number ratios Nu/Nuo,cp determined from averages in the L/Dh direction, as dependent upon the normalized W/Dh coordinate, for different values of Toi/Tw. Symbols are defined in Figure 11.
Grahic Jump Location
Globally-averaged Nusselt number ratios Nu̿/Nuo,cp for fully developed flow conditions as dependent upon Toi/Tw for different ReH.
Grahic Jump Location
Globally-averaged friction factor ratios f/fo,cp for fully developed flow conditions as dependent upon Toi/Tw for different ranges of the Reynolds number, ReH.

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