Two-Dimensional Velocity Measurement of Turbulent Flow in Rib-Roughened Square Channel by using Particle Image Velocimetry

摘要

This study experimentally deals with turbulent flow inside a rib-roughened duct in stationary condition. The two-dimensional flow field was quantitatively evaluated by using a particle image velocimetry which was high spatial- and time-resolution. In the orthogonal rib case, flow separation, reattachment and recirculation were observed around the rib, and high turbulence intensity in front of the rib as a result of the highly fluctuating unsteady velocity vectors was clearly captured.