When blood flows along a blood vessel, the flux (the
Chapter 3, Problem 3.591(choose chapter or problem)
When blood flows along a blood vessel, the flux (the volume of blood per unit time that flows past a given point) is proportional to the fourth power of the radius of the blood vessel: (This is known as Poiseuilles Law; we will show why it is true in Section 8.4.) A partially clogged artery can be expanded by an operation called angioplasty, in which a balloon-tipped catheter is inflated inside the artery in order to widen it and restore the normal blood flow. Show that the relative change in is about four times the relative change in . How will a 5% increase in the radius affect the flow of blood?
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