Abstract
PIV measurement using microbubbles as tracers was attempted. Mean diameter of employed microbubble is around 65μm. Specific gravity of air differs from that of water. It is, therefore, needed to confirm if microbubble can use as tracer. Separated reattaching turbulent flow over a backward-facing (Re=3700,5500) was chosen for test case. Distributions of time-averaged velocity and Reynolds stress obtained using microbubble tracers were generally consistent with those obtained by others. On the other hand Reynolds stress at Re=5500 distributes lower than that obtained by others.
