Steady and pulsating flow characteristics in straight tubes with and without a lateral circular protrusion

Flow characteristics in straight tubes with and without a lateral circular protrusion had been investigated using Particle Image. Velocimetry over a r ange of Reynolds numbers from 400 to 1400, and at Womersley number of 65. T he practical interest of the flows considered lies mainly in blood flows th rough arteries with saccular aneurysm. Both steady and pulsating flow exper iments had been conducted. It was found that under the steady flow conditio ns, a recirculating vortex would be formed inside the circular protrusion. The maximum strength of the vortex would be as low as 10% of the bulk mean velocity in the main tube at the highest Reynolds number tested (i.e. at 14 00). Under the pulsating flow conditions, the vortex appeared and disappear ed at different phase of a cycle. The sequence was only punctuated by quasi -inviscid flow behavior. The steady flow results only resembled those of th e pulsating ones for about 1/10 of the time at each cycle.