Blood velocity: The flow of blood in a large artery of an anesthetised dog is diverted through a Venturi meter. The wider part of the meter has a crosssectional area equal to that of the artery. $A = 8\; mm^2$. The narrower part has an area $a = 4 \;mm^2$. The pressure drop in the artery is $24\; Pa$. What is the speed (in $m/s$) of the blood in the artery?
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Answer We take the density of blood from Table to be $1.06 \times 10^{3} kg m ^{-3} .$ The ratio of the
areas is $\left(\frac{A}{a}\right)=2 .$
$v_{1}=\sqrt{\frac{2 \times 24 Pa }{1060 kg m ^{-3} \times\left(2^{2}-1\right)}}=0.123 \;ms ^{-1}$
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