Answer :

(a) Reynolds’s number,


Where,


ρ = density of the fluid


v = largest average velocity of the fluid


D = diameter of the duct


μ = viscosity of the fluid


We have,


Density of the blood, ρ = 1.06 × 103 kg/m3


Reynolds’s number for laminar flow in duct, Re = 2000


Viscosity of the blood, μ = 2.084 × 10-3 Nm/s


Thus,


Largest average velocity,




= 1.962 m/s


(b) Dissipative forces are more important when flow velocity is increasing because increase in flow leads to turbulence.


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