Key result
Flow at low Reynolds numbers in glass models of arterial bifurcations and berry aneurysms demonstrated small wave motion and larger vortices akin to a Kármán vortex street.
In vitro glass models demonstrate that flow disturbances at arterial bifurcations and aneurysms at low Reynolds numbers are characterized by wave motion and vortex shedding due to boundary layer separation.
Glass model vortex observations should not change aneurysm management; leaves open their role in human bifurcation disease.
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.
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W.E. Stehbens (1975) studied Arterial bifurcations and berry aneurysms. Flow at low Reynolds numbers in glass models was evaluated on Flow characteristics (wave motion and vortices). Flow at low Reynolds numbers in glass models of arterial bifurcations and berry aneurysms demonstrated small wave motion and larger vortices akin to a Kármán vortex street.