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This study experimentally deals with turbulent flow inside transverse-or angled-rib-roughened square two-pass channel in stationary condition. Details of the two-dimensional flow field were quantitatively measured by using a particle image velocimetry to which was applied Frame-staddling method with high-resolution CCD camera. Angled-ribs generated secondary flow along the rib, flow separation, and reattachment similar to the transverse-rib case. A secondary flow of turning flow caused by a centrifugal force in a sharp turn was stronger than that caused by the angled ribs. Furthermore, the interference between the secondary flow by the sharp turn and the angled ribs was observed and high turbulence intensity between the ribs and after the sharp turn as a result of highly fluctuating unsteady fluid motion was clearly captured.

Interference Between Secondary Flows Caused by Angled-Ribs and Sharp Turn in Turbulent Flow of Square Two-Pass Channel