Heat transfer and pressure drop measurements of rotating rib-roughened parallelogram channel

S. W. Chang, T. M. Liou, T. H. Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


This experimental study examines the pressure-drop coefficients f and the detailed Nusselt number Nu distributions over two opposite leading and trailing walls roughened by 45 deg ribs for a rotating parallelogram channel with radially outward flow. For the first time, the isolated effects of Reynolds Re, rotation Ro, and buoyancy Bu numbers on local and area-averaged Nusselt numbers Nu and Nu measured from the infrared thermography method were successfully examined at the parametric conditions of 5000 ≤ Re ≤ 15; 000, 0 ≤ Ro ≤0:3, and 0:001 ≤ Bu ≤ 0:23 for the single-pass parallelogram channel. A set of selected heat transfer data illustrates the Coriolis and rotating-buoyancy effects on the detailed Nusselt number distributions and the area-averaged heat transfer performances of the rotating parallelogram channel. With the consideration of the f data generated at the isothermal conditions, the thermal performance factors η for this radially rotating channel were evaluated. The Nusselt numbers obtained from the leading and trailing walls of the rotating test channel fall in the respective ranges of 0.78-1.34 and 1.09-1.38 times the stationary levels, whereas the η factors are in the range of 0.979-1.575 for the present test conditions.

Original languageEnglish
Pages (from-to)98-107
Number of pages10
JournalJournal of thermophysics and heat transfer
Issue number1
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Space and Planetary Science


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