High rotation number heat transfer of a 45° rib-roughened rectangular duct with two channel orientations

T. M. Liou, S. W. Chang, J. H. Hung, S. F. Chiou

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Abstract

An experimental study of heat transfer in a radially rotating rectangular channel of aspect ratio 1/2 with two opposite walls roughened by 45° staggered ribs is performed. Heat transfer distributions along centerlines of two rib-roughened surfaces are measured for the radially outward airflow at test conditions of Reynolds number (Re), rotation number (Ro) and density ratio (Δρ/ρ) in the ranges of 5000-15,000, 0-2 and 0.07-0.28. The rotating test rig permits the generation of heat transfer data with Ro considerably higher than previous data ranges. A selection of experimental data illustrates the individual and interactive influences of Re, Ro and buoyancy number (Bu) on local heat transfer with two channel orientations of 0° and 45°. With Ro varying from 0.1 to 2, heat transfer ratios between rotating and static channels on the stable and unstable rib-roughened surfaces with 0° (45°) of channel orientation are in the ranges of 0.5-1.42 (0.5-1.49) and 1.08-2.73 (1.06-2.21) respectively. A set of heat transfer correlations for the test geometry with channel orientations of 0° is derived to evaluate the local Nusselt number (Nu) in the periodically developed region with Re, Ro and Bu as the controlling flow parameters.

Original languageEnglish
Pages (from-to)4063-4078
Number of pages16
JournalInternational Journal of Heat and Mass Transfer
Volume50
Issue number19-20
DOIs
Publication statusPublished - 2007 Sep 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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