Flow in glass models of arterial bifurcations and berry aneurysms at low Reynolds numbers

Using the dye injection technique, flow at low Reynolds numbers was studied in glass models which simulated arterial bifurcations of varying angles and had varying bluntness of the apex or crotch. Forks bearing small saccular evaginations simulating berry aneurysms were investigated similarly.. At quite low Reynolds numbers in all the models small wave motion was observed at the forks. At higher Reynolds numbers and below the critical values for turbulence, larger Vortices akin to a Kármán vortex street were shed from most of the forks. The disturbances were attributed to boundary layer separation and a jet-edge effect.