I know that from the equation of Reynolds number that as the

I know that from the equation of Reynolds number that as the diameter increases the Reynolds number increases and as the velocity of flow increases Reynolds number increases too increasing the likelihood of turbulent flow. But I don\'t understand why in narrowed blood vessel(stenosis) why we have turbulent flow although the diameter is actually decreased. I know velocity is increased in this case but does that mean that velocity effect Reynolds number more in this case? if so, can you please explain why.

Solution

due to viscous head loss and flow choking