Pulsatile viscous flow in a curved pipe: Effects of pulsation on the development of secondary flow

摘要: Abstract This work presents an experimental and numerical study of pulsated Dean flow, three-dimensional pulsatile flow in a curved pipe. The is performed by CFD code (Fluent 6) which velocity field imposed as inlet condition. setup involves principally “Scotch-yoke” generator 90° bend. Laser Doppler Velocimetry (LDV) measurements have shown that the Scotch-yoke produces pure sinusoidal instantaneous mean velocities with deviation 3%. Visualizations laser-induced fluorescence (LIF) measurements, coupled results, permitted analysis evolution swirling secondary structures develop along bend during pulsation phase. These were made for range stationary Reynolds number ( 300 ⩽ Re st 1200 ) , frequency parameter 1 α = r 0 ω / ν 2 20 two components ratios β U max osc . We observe satisfactory agreement between results. For high β, structure modified Lyne instability siphon effect deceleration intensity decreases increases acceleration During phase, under reverse appearance flow.