# Question about Poisseuille's law and blood flow

don_anon25
I know that rate of flow is equal to pi*(P1-P2)*R^4/8nL. For blood in the coronary artery, I know the pressure drop, and the radius of the artery. What is the viscosity of blood? I can't find this value anywhere! And what value should I enter for L (distance L along a tube)? Is there an actual value somewhere for the length of the coronary artery in mm?

$$\mu_{water} = 20.92 \frac{Lb_f sec}{ft^2}$$, that would mean that $$\mu_{blood} = 3.0 \mu_{water}$$ so...
$$\mu_{blood}= 62.76 \frac{Lb_f sec}{ft^2}$$
$$\mu_{blood}= 3.0 x 10^6 cP$$