Heat transfer in a radially rotating square-sectioned duct with two opposite walls roughened by 450 staggered ribs

Shyy Woei Chang, Tong Minn Liou, Wen Hsien Yeh, Jui Hung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


This paper describes an experimental study of heat transfer in a radially rotating square duct with two opposite walls roughened by 45° staggered ribs. Air coolant flows radially outward in the test channel with experiments to be undertaken that match the actual engine conditions. Laboratory-scale heat transfer measurements along centerlines of two rib-roughened surfaces are performed with Reynolds number (Re), rotation number (Ro) and density ratio (Ap/p) in the ranges of 7500-15000, 0-1.8 and 0.076-0.294. The experimental rig permits the heat transfer study with the rotation number considerably higher than those studied in other researches to date. The rotational influences on cooling performance of the rib-roughened channel due to Coriolis forces and rotating buoyancy are studied. A selection of experimental data illustrates the individual and interactive impacts of Re, Ro and buoyancy number on local heat transfer. A number of experimental-based observations reveal that the Coriolis force and rotating buoyancy interact to modify heat transfer even if the rib induced secondary flows persist in the rotating channel. Local heat transfer ratios between rotating and static channels along the centerlines of stable and unstable rib-roughened surfaces with Ro varying from 0.1 to 1.8 are in the ranges of 0.6-1.6 and 1-2.2 respectively. Empirical correlations for periodic flow regions are developed to permit the evaluation of interactive and individual effects of rib-flows, convective inertial force, Coriolis force and rotating buoyancy on heat transfer.

Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air
Number of pages10
Publication statusPublished - 2006 Nov 15
Event2006 ASME 51st Turbo Expo - Barcelona, Spain
Duration: 2006 May 62006 May 11

Publication series

NameProceedings of the ASME Turbo Expo
Volume3 PART A


Other2006 ASME 51st Turbo Expo

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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